Interesting experiments. Enjoyed watching and learning of the results. I have noticed a considerable thermal benefit in winter when using dual layered shelters even if the layers are something as thin as two tarps
@@Reallybigmonkey1 yea always good to know the weather patterns in your area for all seasons esp hot/ cold so to adjust air breeze to come thru or not.just watched your snake pit tent camp .great ideas for fire ty...yeah if you found four trees there in a box area you could put a rain tarp over when neccassary little incline maybe a couple feet longer each way at least.than the size of your tent.it should at least help or until you/us may need a new idea to learn...ty again
It's called 'latent heat of evaporation'. All refrigerator's work on this principle. To evaporate, water needs heat. It takes it from whatever heat source is nearest. The dampness in the grass will also have a cooling effect until it dries. In Australia they will pile brush on top of tin roofs to insulate and shade the roof which will work like your two layer tarp creating airflow and heat dissipation. In North Africa they build a sort of chimney which heats up and creates airflow through the house with fountains in the courtyard so the water draws away the heat as it evaporates. To cool yourself using water the most useful way would be to wrap or lie in a damp cotton sarong. Or a damp shemagh around the head. That way it takes the heat from your body first.
Lately when back packing in the sun, I've been wetting down and wearing a wicking material tee shirt, really effective , feels like your air conditioned! Also in stead of arriving at your destination with sweaty wet tee shirt, ive been getting where I aimed to with a tee shirt that actually dried finally from its initial cold water soaking.
Kevin, good comments. In Indio, California, where temperatures often reach 115 degrees or higher during July and August, I have learned that running the hose all over my head and torso, soaking my hat and cotton t-shirt, allows the relative temperature to drop 30 degrees or more, so long as the t-shirt stays wet. Repeated every hour or so, this will get you through a terribly hot day. Some beauty queens (male and female) are initially reluctant to compromise their appearance with a good soaking, but after seeing others survive the indignity, will usually give it a try. Remember to allow the super heated water from a sun-exposed garden hose to run out before soaking your head and body. The three factors of SHADE, MOISTURE, and BREEZE, working together, are more important than temperature for comfort. The body is able to reduce its own heat through sweating until temperatures reach 94 degrees, at which point the body cannot keep up and begins to absorb heat. Moisture -- even non-scalding warm water -- will immediately draw the heat out of the body, and then evaporate. A considerable amount of heat is required to turn liquid water to vapor. The breeze takes away the evaporated water, as the remaining water draws out more heat. Because air conducts heat and cold quickly, a shaded environment (under a wide brim hat, umbrella or unenclosed porch) is much cooler than under direct sunlight, especially in the presence of moisture and a gentle breeze. The combination of SHADE, MOISTURE, and BREEZE will save you and your companions from heat exhaustion and heat stroke.
@@clark57225 Thanks. Shade, Moisture, Breeze. Here in the UK at present we have more than enough of all three but the occasional heatwave can wreak havoc. 😓 My grandmother had a milk bottle cover made of a brown ceramic which soaked up water. It was placed over the bottle in a dish full of water. That thing could almost freeze the milk if the water was topped up. In Spain they use big fountains to reduce the heat in cities public spaces. A practice brought by the Moors of North Africa when they occupied Spain in the middle ages I believe. Lots of innovative uses of water for cooling before we started using dodgy refrigerator fluids.
Reallybigmonkey1 - What about a white tarp? White/lighter colors reflects the sun - Black/darker colors absorbs the sun. BTW - I appreciate you & your videos. Hope you're having an awesome day.
Dave reminds me of Lonnie from Far North Bushcraft & Survival experimenting with a "fire reflector" or "heat reflector" (the wall you build behind a campfire), eventually proving that under the conditions he tested, it doesn't actually reflect any heat into a lean-to shelter on the opposite side. What it does, instead, is guide the hot air to rise directly behind the fire so that it keeps most of the smoke out of your shelter.
Interesting! The 2 tarp method sounds great for desert scenarios. Also, I'm going to turn over my auto sun shade and see if that makes a difference there as well.
My preferred setup for a tarp in the summer is a simple 'A' frame with the two sides at least a foot up off the ground to let a breeze flow through. I also build my fire at least 6 feet away to keep that heat from building up inside the tarp. I use a lightweight 8 X 10 silnylon tarp (I have a heavier weight one for cooler weather) and set up in the shade.
Thanks, Dave! Your findings blew me away. Here's why. We used tents in Iraq 2003 and 2004. They were the old Aframe single layer plastic/rubberish covering. They were stinking hot! We put camo netting over the tents and it put some serious shade on the tents. After the net was up it was drastically cooler inside. Your findings made me say whaaa? 2 to 4 degrees difference? Dave, I realize that we had about 3 feet of distance between the camo net and tent. I believe that if you increase the distance between the two tarps, you will see a bigger difference in temperature. Or perhaps Georgia isn't the desert, right? Watery air vs dry air. Also, the canteen cooler does work in the desert environment. I kept a liter water bottle hung in a wet sock in the shade and it did cool hot tea water to a drinkable temperature. It's all due to rapid evaporation. It works in the desert but not really in Arkansas.
I love hearing from folks with desert experience. Like you said tho, it's dry there and very humid in Georgia. I hope to test the higher gap theory before Fall. Thanks for watching
Well ole Dave,first of all this is Aug.2022,I was trying to watch your video you put out today Friday 8-22 but couldn't find it yet but anyways I came up on this 3 tarp setup and was just wondering, since the reflective side out tarp made it hotter inside in the summertime would it also make it warmer in the winter to put the reflective side out or maybe in the winter put one reflective side in and cover it with one reflective side out .You are the scientist here so your input will determine what I try if I camp out this winter...I'm getting old and can't hardly sleep outside anymore,anyways thanks for your videos and I really look forward to watching them on Friday mornings with my coffee as the sun is coming up.Hang in there brother and your son,you guys are definitely making some great content videos
From the various experiments I've done with reflective mylar type tarps I'm convinced they do not work well in summer heat. Maybe there's a trick to it that I'm not aware of but no matter if it's inside or outside this material works incredible in cold weather. In recent times I'm finding it's more beneficial to just camp in the shade and try to funnel the wind into the shelter. Thanks for the comments and thanks for watching Dennis
I think to follow the canteen design, the wet blanket should be under the tarp. Evaporative coolers work great in our California dry desert, but not when humid.
Or just lose the tarp altogether and then you've got old school air con with the breeze coming through the wet blanket or wet sheet that's not being stopped by the tarp..? Which of course is dependant on there being a breeze of some sort of course. Just think of breeze/air hitting your sweaty shirt..cools you down.
I was pondering the same question on the heat difference between the dark side and reflective side of a tarp out in direct sunlight. Awesome video you answered my question!
It’s so good to hear a guy that talks like you also acting smart at the same time. Like how you knew that the sun changing positions would compromise the results of your experiment. Saying that like a hillbilly only makes us look good.
I want to add one more comment Dave. I just feel really good when I’m watching one of your videos. You’re the go-to channel that I want to watch when I want relax. Don’t change your intro greeting. I do some video work both for my enjoyment and also for TH-cam. I know how much work goes into what you do behind the scenes with editing and such. Anyway, Grants Pass Oregon is watching and I look forward to the next one. Later, Steve Arnold
It's not a horrible video Dave. I watch ur videos cause u give a lot of knowledge away for free . Things u could charge for but u care about ppl learning an getting out in the woods n to have fun. U are my favorite youtuber to watch. Thank u for ur the effort u put in n the enthusiasm u have while making these videos. Hope all is well with u n Nick.
BIG 👍👍’s up!! Here’s another headscratcher for your consideration: How about that 2d tarp ( with the air gap ) hanging over the tarp with the black jungle blanket on it ?? Here’s a thought on a passive air conditioner for your tent - as air travels through a large opening and narrows down to a smaller exit opening it cools off ! Same thing happens when you pucker your lips and blow warm body temp air into your hand - cools. So how about a hoop about 3’ diameter and 3-4’ sheet of plastic drop cloth in the shape of a cone Large end attached to the hoop , small end a small hoop of about 10”. Use a couple of sticks or walking sticks to prop the hoops up To capture the air flow. Might need a tarp to block the sun heating the air in it but it should move fast enough that it may not be a problem I’ve never tried it but I did see a TH-cam where a family in Africa used a 1/2 sheet of plywood, drilled a couple line of holes so that they could stick the neck of a liter plastic soda bottle into it . The bottles had their bottoms cut off and the plywood was than nailed over a hole they. It in their wall for it. And it worked !!
Thanks Ken! Several more experiments need to be done along the lines of what you mentioned. I really like your air catching cone idea! That needs testing too
19:05 I did this same experiment! The double tarp, with an 8 inch air space, gave me 11 degrees cooler temperature. I got the idea when I saw an old man build a lean to cover his camper leaving a one foot air space. He swore it made his camper cooler. Of course, I had to find out for myself. Enjoyed the video, as usual!
@@Reallybigmonkey1 Direct sunlight. I couldn't believe the old man with the camper was right. I went back to the old man's house a couple of weeks later and thanked him for the tip.
@@Reallybigmonkey1 I did do something a little different from what you did. The top tarp was about two feet wider than the bottom tarp. I made an 8 inch gap in between the bottom tarp and the top tarp. But the top tarp had the sides flared out more than what your showing in your video. It may have helped the air circulate more. Just thought I'd mention it. You may want to try it.
Thank you Dave I learned a lot from this video also I want to try to clarify to myself what you said was no matter what you would get a 2ﾟ difference no matter what and I think what you meant was between shelters but what I discovered or noticed in the video is you get a 10ﾟ difference from outside temperature to under the tarp if you go with a double tarp and that is crazy awesome. Thanks again Great video
It has more to do with the ground being heated and air movement. Think of it like the freeze line in winter. After a long time below zero, the ground can be frozen 1'-2' down. So on a nice sunny day, the surface may heat up but it will still be cold several inches below the surface unless you have something that compounds the suns weak heat. So ever though you are in essence blocking out the sun, the ground will still be releasing heat for much of the day. The more sun great is blocked out, the quicker the ground cools and this will even cause air movement, further cooling the ground. In the trees, the ground never heats up. The tree tops heat up causing air movement changes to further dissipate heat.
@@Reallybigmonkey1 Great video. Love 'em all. So next experiment can you try different scenarios of cooling the ground (as mentioned in above comment) and keeping it cool in a bushcraft adventure.
Great information. It made so much sense to me to use an insulation factor to keep cool. I actually have used a Grabber with a silk quilted blanket in white. Cools very nicely.
Dave...i enjoy your videos most of all! They're educational for all ages that do not know about "bushcraft"...which... Thanks to YOUR channel, & others... it's making a comeback! I like how you keep scientific notes. This is GPD
I’m very shocked that there wasn’t that a bigger cooling effect using a double tarp. Obviously, placing a shelter in the shade would be optimum. Great job Dave! Thanks for all your videos. -Stephen, Ohio
Thank you so very much for taking the time to experiment with different setups and ways of doing things. It really helps. It's like watching bushcraft, and a science show in one. You're the MacGyver of the bushcraft world.
For arctic camping, they use 2 or 3 layer tents with an inch or two of air between the layers for insulation. It would be interesting to know whether arranging your test with layers of air between would keep things cooler.
Yes it does,it is done in a desserts to,'trapped' air insulate in cooler as in hot climate Like a thermos,put something cool in it and it stays cool Put something hot in it,and it stays hot
they don't really, because the overall gain in insulation is outweighed by carrying all that extra weight. Traditional lavu's and tipi's are always single skinned, some modern ones have an inner tent but this is mostly to keep condensation and bugs out. If you want insulation in the arctic, we use snow. It's free and abundant and is the best all round insulator that you can get up there.
I love watching your mind work. Another informative and entertaining video. I don't know if I'm setting up 2 tarps for 2 degrees but makes me think about the possibilities. Keep up the good work and see you in the next one!
Great experiment my friend. Excellent information to know. Never would have thought of trying to find out if there would be any temp change. I'm like you, I just don't camp in the sun.😁👍
I like the video you did with the cool air off a creek tubed up to a tent. That made a great difference. Thanks. For the experiment. Sun bad shade good. 🤗
Thanks Marie! That was an excellent set up and for my area? That's the way to go. I feel sorry for those campers that have no spring fed creeks or shade trees. Thanks for watching!
It wouldn't be much better in the desert if their was a breeze. The constant flow of hot air across hot sand would not allow for the heat to be disbursed. In the dessert your back would have to be to the wind and the outer tarp would have to be further away to cad a shadow. Also you would have to remove about 2 inches of top sand since it holds heat very well. Don't use sand for a wind row because all you will be doing is allowing for hot sand to be carried back in. The break tarp would have to be almost ventricle and cast a shadow past the lean to to create any real change in temperature.
Best part was scaring the cat with the hose 🤣 But seriously, very interesting. I didn't expect any of those results. Especially the reflective tarp, I'd have bet my last dollar that would have been the coolest shelter.
Dave is famous for loving cats! Check out the wonderful parody by Brooke Whipple of Dave's channel a couple of years ago! Brooke is just about the Queen of Bushcraft Comedy, as well as being a two-time pick to contest the ALONE challenge.
thanks for info...I live in the Mohave Desert, today was 112F and I've thought about it multiple times, what if the truck broke down, no A/C, no one around and we had to keep the sun from cooking us...? Just having water is not enough, though it may be the difference of life or death. I am also a steel building erecter. Two years ago we had to install the roofs on 3-326' x 90' buildings, galvanized metal over insulation with foil facing upwards. We baked in the 110-116F temps. I can tell you from that experience the sun exposure makes a huge difference. Inside the buildings without a breeze it was noticeably hotter than outside, but did not feel as hot as being in direct sunlight. A breeze helps a lot. What made the most difference on the second building was a battery operated, bucket misting fan. Cool off a few seconds with it every ten minutes and it was amazing how much better things were. If I had to guess, 30F cooler while cooling down. 5 of us went through 10 gal of water each day minimum. So my thought mixed with experience and your experiment hints at making a gravity-fed, or spring-tensioned-pressure mister used below a two layer shelter really could cool things off a lot. Hmmm, wonder if someone sat on a bladder if it would be the pressure needed to mist? I got work to do...
Thanks for the comments. I love your idea for a mist maker. I'm sure that will work great in the desert but probably won't here in Georgia due to our constantly high humidity. In certain situations I can see where it might help. Thanks for watching
David that was a great experiment. I do believe I will carry to tarps for now on....... lol..... I want to be as cool as I can. Unless there's a lake near by then I'm cooling off in it. That's why I like camping in the spring or late fall. So much cooler. Have a great weekend, Chris from Missouri
The reflective side will reduce the radiant heat but not effect the convection heat. The reflective tarp was in the middle collecting the convection heat from the other two tarps leaving the results inconclusive. It is same when a person in between two other people will be warmer due to the convection heat transfer. This does not include contact because that would add conduction heat transfer. Try the video again and put the tarp on the outside. Great video though.
Trevor Cassell I was thinking the same thing about the middle setup being affected by the side tarps. And also one end was near the tree casting a shade on the ground.
In the eighties, a camera company did a test on which camera bag kept equipment the coolest. The lighter colors, were cooler for the first hour but after 4 hours in direct sun, they were all the same temp. inside the bags.
@@Reallybigmonkey1 You said in vid that you didn't understand how moisture cools. Have you noticed that when you get out of the shower, that your body is cooler until you are dry? Notice how when one soaks your canteen liner, the moisture is touching the product. The reason swamp coolers are not used in the south is because the humidity is too high for them to be effective, I think the next test would be to use a tarp for shade and the the damp blanket on the other side and ends to keep warm air out. Similar to keeping cold air out in winter.
Great subject and handling on your part. Ron Hood covered this in his Desert Survival video., and the two tarp system is in official survival manuals (as is digging a pit to shelter in). There was a part in his video where he showed that using black material actually shielded the Sun's energy better than lighter material, hence the reason why the Bedouin dress in black. I'll have to go back and see the layering method though. Thanks for all your hard work and dedication!
Thanks Jeff, I'm glad you liked it. I believe everything Ron Hood taught but Im amazed at how many arguments folks get in over white or black for sun protection. Mors also says black tarps are better. Thanks for watching
Put something down and a cat will lay on it!!! lol A very smart and informative test Brother... Really good to know how all these materials act in the hot sun. Thanks for doing the hard work for us!! lol... Cheers!
Great video Dave. Thank you for the time you take to make these informative and entertaining videos for us. Your dedication to your channel and us hit home when you said you had to be to work in 30 min and there you were working on the video instead of relaxing before heading into work. Not so sure I could be as dedicated so thank you for your time and creativity.
"Fun with science.... and cats!" Much learned - and I learned that where you live it is damn hot weather! BUT it is not a good shelter, the cats refused to use it :(
great job. If we just think why these tarp set ups changed the temperature. If you think about a tree with all of the sun light being filtered out, yet allowing the wind to move through the trees, to a point the deeper the canapé the cooler it is under the tree. I wonder what the temp was under the trees on that day? I think that is why the dual layer tarps worked better. I wonder what would happen with 4 layers and air spaces. Another idea is evaporative cooling, the old refrigerators made with burlap. With air moving through water at the ends of the dual wall tents if that would cool it down, kind of like a swamp cooler, or does the air have to be forced through with a motor to get the effect you would want. Two more ideas, I remember a place in the southern desserts of Utah, by eagle mountain a tall cliff. It acted like a sail and the air would move down the face of it, into a crack that was shaded. If you sat at the bottom of the crack, the air was cooled as it came down in the shade, and was cold. I didn't measure it, but it was like 120 degrees in the sun but at the base the air felt as cold or colder than air conditioning, I would guess 50-60 degrees. Like a refrigerator. We also know if we dig in the ground below the frost line the earth stays at a constant 50 degrees. Like in the back of a cave. If you found a natural trench and with rocks and sticks create a 30 foot tube you could cover over with dirt and then create a draft to go through the tube and into a dual wall tent, as the air moved through the tube it would be cooled and create an air conditioning effect. Some ideas to try or think about how you could facilitate some natural occurrances.
Out of all I learned on this video that was the biggest shock of them all to me. I could have swore it would reflect the heat away. Thanks for watching Michelle
@@Reallybigmonkey1 It seems like one is to mistake "reflective side" with "side mirroring all wavelength". I would bet that a mirror made of metal would also heat up incredibly since the sunlight contains, I dont remember exactly, 1/2 of its energy within the lower (infrared) spectrum. Strange enough, if the reflecitve side is to keep one warm, the infrared part SHOULD be reflected back. But maybe just on a small bandwith of wavelengths? Tempearture of sunlight roughly 6000 K, temperature of body skin roughly 300 K ... :) I'm really curios how the temperatures would have evolved using a light blocking WHITE fabric (maybe made of cotton, not plastic). I believe it would heat up only slightls in opposite to a metallic mirror (compare car heating up in the sun...), even thouth a fictional metallic mirror would reflect all human visible wavelengths!
@@Reallybigmonkey1 No indeed I would suggest a white cloth outer layer and the inner layer - I dont know! Maybe just this one layer. But light-blocking white. There ar curtains made for blocking light (almost) completely. That ones in bright white. Propably won't make a good tarp material, could be hard to keep it clean :-D But for bushcraft sience, why not!
I sure love your videos!! Thanks for making the time to do them I really enjoy all you share..thanks again, I've missed you while you were gone very happy your back on!
You should try a white blanket. And black blanket. Blackbattracts sun while white or light colors should help reflect i worked outdoors alot. And found lighter color clothes keep me cooler
Man brother... In a world of bright ideas and he said / she said, it is nice to see where the rubber meets the road... Thank you for taking the time to set that all up and share your results with the rest of us... And hey, perhaps we all learned something in the process... Excellent video bro... Thanks again... Peace.
Evaporative cooling. The reason it works. Water or water gas (humidity) can change temperature at a very steady rate. Add, lets say. one unit of energy, and the water temp goes up one degree. One to one. But,,,, when water changes phase,, from liquid to ice,, or liquid to vapour,, the change needs or releases lots of energy. Your experiment involves taking water from 212 liquid,, to 212 vapour. Same temperature , but liquid to vapour. Now to be clear, evaporation takes place at all sorts of temperatures,, but on that little bitty scale of just one molecule,, the change really is boiling water. The energy required,, or in your case absorbed. So,,,, if it needs one unit of energy to raise the water temperature one degree,,, between 32 degrees, very cold but not frozen water,, to bring it to boil at 212 degrees you need 180 units of energy,,, 180 degrees change,, 180 units. BUT,,, to move the water just a little tiny, tiny bit to 212 degrees vapour,, just 212,, to 212 but liquid to vapour,, you need 1000 units of energy,, same temperature,,, just to push it past the phase change. Now the really cool part of water,, is it does not have to all be at boiling. If the sun kicks just one molecule out , if just one molecule evaporates,, it MUST steal some energy from all the liquid around it. When it steals that energy,, it cools the surrounding water. The high energy molecule,, vapor steam,, has to get that phase change energy from somewhere,, so it just takes abit from the liquid around it. You end up with a cooling effect. Same sort of thing happens when water changes to ice. Water gets colder and colder,, one degree at a time,,, but when it wants to shift from liquid water at 32F to frozen water at 32 F,, same temperature,, you have to take 8 units out just to shift it from liquid to frozen. That is why some ice in a cooler can keep things cool for so long. It is not just the cold ice,,,, it is that jump in changing the ice into liquid.
i use the double tarp with an air space often and we can notice that 2 degree difference, i also feel like it blocks more uv rays or something? out here in the Mojave desert one tarp still feels like you are burning under it, but two tarps with an air gap makes a big difference and is much more comfortable. love watching tarp vids and really enjoy seeing you doing these experiments. thx for keeping an old topic fresh. you rock!
In wanted to see double tarp setup with air space and wet blanket as bottom part of pup setup ... Soo you would have shade and evap cooling.... Love your videos Dave ...
Love this! So many people go with overly comnplex or insanely expensive solutions, when there are so many good ones, if you just apply yourself. Awesome little life hack that I put to the test recently... I was camping at high elevation, wet, and it got down into the 30s at night. I was sleeping in a hammock, so the cold was definitely going to be a factor. I bought one of those reflective sunshades for the front windshield of a jeep wrangler rubicon (I think it was about $9 on amazon, and only weighs about 4oz) and put it in my sleeping bag with me. I stayed so warm that my sleeping bag was unzipped all night, and I had a foot sticking out of it.
I use a modern power pack to work a fan to increase evaporative cooling. At the margin, it makes a difference between relative comfort and discomfort for restorative rest.
Great video Dave. Maybe the pup tent configuration was slightly better overall as opposed the standard lean to tarp.... it's a cool 70 degrees here in Scotland. I'd swap that for your backyard ⛺🤠!!
I’m glad I’m not a betting man Dave because there is no way I’d have thought the reflective side out shelter would have been the hottest one. No way. I live in Texas where the dang asphalt boils in the summertime. I really appreciate this kind of information to help me keep my shelters cooler. Every single degree matters when it’s that stinking hot. Great information brother. Thanks for sharing.
Dave this is why I watch your videos, man we can all learn a lot. Interesting results for sure. I figured that with the silver side out would heat up the sleeping area more. Double tarps, lets face it cooler by 2 or 3 degrees does make a difference when staying under a shelter for comfort during the heat of the day. Well done my friend!
Thanks Daniel. Man I was shocked. I thought for sure that set up would reflect the heat away. I guess not. 2 to 3 degrees is better than nothing! I'm glad you liked it. Thanks for watching
@@Reallybigmonkey1 Summer max 38C, Winter -2C. Let's split it down the middle, shall we? 18C all year round. Deal? :D _Oh and Carol, stop touching the damn thermostat every two minutes. Put a sweater on or something_
Awesome test there Brother! I too, was caught off guard by the reflective side not reflecting the sun rays and heat any better... thanks for over taxing Your Brain on this one...ATB to you and Yours.
Why is it that I get seriously happy when I get a notification from my buddy and brother in machining Dave. Makes my day each time. Keep cool and stay safe man.
I’m so surprised that the reflective side facing the sun actually made it hotter! I thought that’s what you were supposed to do in a hot climate with those grabber blankets! Great vid.
Oh I was surprised too! Every winter when I used one near a fire I almost always got the comment "Turn it outwards for summer time" I'm glad you liked it. Thanks for watching Amy!
You crack me up... I don't know if it's because I've watched you so long or not, but I was wondering about that double-walled (pup tent) tarp configuration with the air space when lo and behold you went and did it! Thanks for another great vid! You are about the only reason I have for visiting TH-cam these days.
In the desert we used canvas with a white liner on the inside, it was cooler than just the canvas. In the winter we used the same setup to keep the heat in. On my shelter now the two layers of canvas is cooler than one layer of canvas. Thanks for the test, take care.
Im guessing its because the canvas is thicker and heavier? No way UV rays can get through two layers of canvas but it can a poly tarp! Thanks for watching Quinn
Amen brother it’s definitely hot here in upstate SC too. Great ideas. I remember reading somewhere that either the Greeks or romans would hang wet curtains in their windows for a type of air conditioning. It’s the same reason that we sweat when we get hot for the sweat to evaporate and cool us off. Always enjoy watching your videos. Keep up the good work.
I've liked all your shows, and found this one of particular interest. However I'm curious about how much air flow will effect temperature? Which way was the wind blowing? If any. I think if the wind blows in from the ends the temperature inside the "A" shelter should be lower by eight degrees; if not more. While not much more than a two degree variance if the wind blows on to the sides of the shelter; without a vent in the peak of the exterior layer.
Thanks Jenny. Maybe I'm nuts but it seems to me like winter is the only time where wind direction is constant. In the summer it seems like it blows all around constantly changing direction.
That was so interesting ..thank u for that example.. you took your time to set up each scenario that was very kind of u to do ...i remember camping with a tent and it was so hot and i grabbed what i could and wet it and put it on top to cool it down a little but it didn't do a great difference ...now i know why and like u said dont ever put it directly on the 🌞 😆 ...well mine was on a poor little shade tree never again ...lol once again great information .god bless you and your family
Excellent experiment. Trapping dead air space in between, would be helpful for an inclosed structure with a high ceiling. If temperatures are really too hot one could camp next to water or make your camp at higher altitudes. Stay cool - Enjoy your weeks end. Thanks for another fun and informative video, Dave!
One of the best videos I've seen. Not with a bunch of BS. Just facts about your experiment and the results. In desert survival, we were taught that 6 inches above or below the desert floor was cooler. I'd like to see the same experiment with the temperature checked at that height. Again, excellent job.
This is a COOL experiment and video . Always great to see you happy , healthy and doing your thing . My 65 year old wife - "He is so adorable with lovely eyes .... and that voice" . No... you can't have her . She's filthy rich and helps me reload ammo . All the best Dave and thanks for your video .
This test was great 👍 thank you doing this and sharing it with us. I enjoyed and learned something! I thought for sure having the reflective side out would have been cooler. Lol.
this is great video! it is end of summer, and I am in great lakes region. I would love to extent the camping period to colder days with my kids. Do you have any good way to heat up a tent? in specific, I only have a 3 season costco family tent. so it is really not a good idea to have fire in the tent or really near it.
Thanks! I'm glad you liked it. As far as tent go? If it's car camping just insulate the walls with blankets. If backpacking them bring good quality down bags
Great video.. thanks! OK so two thoughts...there's variables to consider.... all may be under sun..but you need to consider air flow. Also I had a thought.... add another one over the original tarp tarp but 5 inches above it. That top tarp will absorb heat from sun but airflow will flow between 2 tarps cooling down under neath. Like sitting under a tree with a breeze branches protecting u.
That tree your ropes are tied to looks like a great shade tree! What tree is that? Also, you could try a damp blanket suspended under the tarp to get evaporative cooling. Just make sure there is air flowing through and you should be able to get much better cooling underneath.
Absolutely amazing study! AMAZING!! Living in W Central FLA on the Gulf of Mex I've wondered if there was a way to reduce this demoralizing heat and humidity....and by your last experiment it was a full 10 degrees cooler than the thermometer DIRECTLY in the Sun. Learned a lot.....a LOT! Thank you!
We have a few shade trees in the Arizona desert, but they lose their leaves to reduce evaporation. (that's why their bark is green). So thanks for doing this experiment. It means that if the car breaks down by the side of a isolated road, pull out a couple of tarps and get some better protection from the sun. ❤🌅🌵
Im guessing yall dont have many shade trees there? Yall also dont have high humidity so the techniques that work here may not work there or vice versus? Thanks for watching Suzi
Great video David The evaporation based system I think only works on small system, a water canteen etc In the heat you need height inside the tarp and open ends so the hot air can rise and any wind carry it out of the tarp If you want to cool down an area with water the water mist system is best used but not practical for a tarp shelter In Europe and I would assume in hot climates in the US they paint roof mounted water tanks black so the sun heats the water up inside so later afternoon early evening you can have a warm shower before binner. Buildings are generally painter white and white cars are used in hotter climates as the colour white reflects the infra red rays better. All the best and take care David
Enjoyed watching this experiment. Saves us all from cooking ourselves under the heat reflector blanket . Nice to know whether it actually works or not.
@@Reallybigmonkey1 viewing from Ontario Canada where the early evenings are already cold.......so I'm apt to be turning that shiny blanket towards myself pretty soon with an emergency blanket if my solo hike/camp on the Bruce Trail goes wrong LOL
Hey Dave, I know you did this video about 4 years ago or so but I like to rewatch your videos every now and then. And I am wondering what if you put the wet blanket inside of a tarp? This would be more like the canteen cover that way. Just a thought. Hope you still get comments on your old videos . Thanks
Great video! Have thought of this too since wife and kids prefer staying on trail where we tend to find open sun. Only theoretical addition to the test would be a hammock simulation for off the ground sleeping, but I don’t think it will matter with good airflow. Also in practical terms, when I can setup a hammock I am naturally going to be under shade from trees not in open sun.
Hi Dave. Glad to see you got your lawnmower working. Your grass was needing it in the last video. Ha Ha I noticed. On your tarp experiment, you might try putting the moving blanket under the tarp. I think that is were you need the insulation. I do like how you try different and new ideas. Give that a go. Personally I camp under a good tree covered area with the open end facing the breeze. On a lake of course in the summertime.
I enjoy your videos, sir. That last part of the video you, you had the double tarp set up, with about a 6 inch air gap, what if you increased that to about 12 to 16 inches? What kind of temperature drop would you have then?
Hey Dave just a thought but before you put the black blanket on the trap the temp was 90 and after you put the black blanket on and waited 30 min it went up 7 degrees. So using the tarp with the green side out was in fact the coolest of all you tried. Great video!
Interesting experiments. Enjoyed watching and learning of the results. I have noticed a considerable thermal benefit in winter when using dual layered shelters even if the layers are something as thin as two tarps
Thanks Lonnie, I'm glad you liked it. I have never tried dual layers in the winter. I may just have to. Thanks for stopping by Brother.
@@Reallybigmonkey1 yea always good to know the weather patterns in your area for all seasons esp hot/ cold so to adjust air breeze to come thru or not.just watched your snake pit tent camp .great ideas for fire ty...yeah if you found four trees there in a box area you could put a rain tarp over when neccassary little incline maybe a couple feet longer each way at least.than the size of your tent.it should at least help or until you/us may need a new idea to learn...ty again
It's called 'latent heat of evaporation'. All refrigerator's work on this principle. To evaporate, water needs heat. It takes it from whatever heat source is nearest. The dampness in the grass will also have a cooling effect until it dries. In Australia they will pile brush on top of tin roofs to insulate and shade the roof which will work like your two layer tarp creating airflow and heat dissipation. In North Africa they build a sort of chimney which heats up and creates airflow through the house with fountains in the courtyard so the water draws away the heat as it evaporates. To cool yourself using water the most useful way would be to wrap or lie in a damp cotton sarong. Or a damp shemagh around the head. That way it takes the heat from your body first.
Lately when back packing in the sun, I've been wetting down and wearing a wicking material tee shirt, really effective , feels like your air conditioned!
Also in stead of arriving at your destination with sweaty wet tee shirt, ive been getting where I aimed to with a tee shirt that actually dried finally from its initial cold water soaking.
@@neilblackman2965 Cool!
Thanks for the info Kevin!
Kevin, good comments. In Indio, California, where temperatures often reach 115 degrees or higher during July and August, I have learned that running the hose all over my head and torso, soaking my hat and cotton t-shirt, allows the relative temperature to drop 30 degrees or more, so long as the t-shirt stays wet. Repeated every hour or so, this will get you through a terribly hot day. Some beauty queens (male and female) are initially reluctant to compromise their appearance with a good soaking, but after seeing others survive the indignity, will usually give it a try. Remember to allow the super heated water from a sun-exposed garden hose to run out before soaking your head and body.
The three factors of SHADE, MOISTURE, and BREEZE, working together, are more important than temperature for comfort. The body is able to reduce its own heat through sweating until temperatures reach 94 degrees, at which point the body cannot keep up and begins to absorb heat. Moisture -- even non-scalding warm water -- will immediately draw the heat out of the body, and then evaporate. A considerable amount of heat is required to turn liquid water to vapor. The breeze takes away the evaporated water, as the remaining water draws out more heat. Because air conducts heat and cold quickly, a shaded environment (under a wide brim hat, umbrella or unenclosed porch) is much cooler than under direct sunlight, especially in the presence of moisture and a gentle breeze. The combination of SHADE, MOISTURE, and BREEZE will save you and your companions from heat exhaustion and heat stroke.
@@clark57225 Thanks. Shade, Moisture, Breeze. Here in the UK at present we have more than enough of all three but the occasional heatwave can wreak havoc. 😓 My grandmother had a milk bottle cover made of a brown ceramic which soaked up water. It was placed over the bottle in a dish full of water. That thing could almost freeze the milk if the water was topped up. In Spain they use big fountains to reduce the heat in cities public spaces. A practice brought by the Moors of North Africa when they occupied Spain in the middle ages I believe. Lots of innovative uses of water for cooling before we started using dodgy refrigerator fluids.
Let's nominate Dave for the Nobel Peace Prize for science! Seriously, great job Dave. You followed the scientific method and proved a point.
I agree 100 %
Thanks!
Reallybigmonkey1 - What about a white tarp? White/lighter colors reflects the sun - Black/darker colors absorbs the sun.
BTW - I appreciate you & your videos. Hope you're having an awesome day.
great job Dave! if the Government did this scientific study it would have cost us Billions!
Dave reminds me of Lonnie from Far North Bushcraft & Survival experimenting with a "fire reflector" or "heat reflector" (the wall you build behind a campfire), eventually proving that under the conditions he tested, it doesn't actually reflect any heat into a lean-to shelter on the opposite side. What it does, instead, is guide the hot air to rise directly behind the fire so that it keeps most of the smoke out of your shelter.
Interesting! The 2 tarp method sounds great for desert scenarios.
Also, I'm going to turn over my auto sun shade and see if that makes a difference there as well.
Thanks Jeanette! Those auto shades are the same principle. Thanks for watching!
My preferred setup for a tarp in the summer is a simple 'A' frame with the two sides at least a foot up off the ground to let a breeze flow through. I also build my fire at least 6 feet away to keep that heat from building up inside the tarp. I use a lightweight 8 X 10 silnylon tarp (I have a heavier weight one for cooler weather) and set up in the shade.
Makes sense Robert!
this is exactly the kind of things I wonder about when camping. thanks for trying out different methods for us...great video.
I'm glad you liked it Michael! I'm planning on some different variations of these tests this summer. Thanks for watching
I live in Tennessee and I've found the best way to beat the heat is with a 5 ton A.C. and tall cold iced tea. 😎
Or a nice stream with shade and a quality water filter 👍👌✌
Lol, I agree.
Some might call that cheating.....Not I.
Maybe a mint julep?
I'm in eastern Kansas and I couldn't have said it any better.
Thanks, Dave! Your findings blew me away. Here's why. We used tents in Iraq 2003 and 2004. They were the old Aframe single layer plastic/rubberish covering. They were stinking hot! We put camo netting over the tents and it put some serious shade on the tents. After the net was up it was drastically cooler inside. Your findings made me say whaaa? 2 to 4 degrees difference? Dave, I realize that we had about 3 feet of distance between the camo net and tent. I believe that if you increase the distance between the two tarps, you will see a bigger difference in temperature. Or perhaps Georgia isn't the desert, right? Watery air vs dry air. Also, the canteen cooler does work in the desert environment. I kept a liter water bottle hung in a wet sock in the shade and it did cool hot tea water to a drinkable temperature. It's all due to rapid evaporation. It works in the desert but not really in Arkansas.
I love hearing from folks with desert experience. Like you said tho, it's dry there and very humid in Georgia. I hope to test the higher gap theory before Fall. Thanks for watching
Love your cat. You could call this video, "Cat and a Hot Tarp Roof."
ha!! love the title ;)
Lol!
Well played Well played indeed! LOL
Well ole Dave,first of all this is Aug.2022,I was trying to watch your video you put out today Friday 8-22 but couldn't find it yet but anyways I came up on this 3 tarp setup and was just wondering, since the reflective side out tarp made it hotter inside in the summertime would it also make it warmer in the winter to put the reflective side out or maybe in the winter put one reflective side in and cover it with one reflective side out .You are the scientist here so your input will determine what I try if I camp out this winter...I'm getting old and can't hardly sleep outside anymore,anyways thanks for your videos and I really look forward to watching them on Friday mornings with my coffee as the sun is coming up.Hang in there brother and your son,you guys are definitely making some great content videos
From the various experiments I've done with reflective mylar type tarps I'm convinced they do not work well in summer heat. Maybe there's a trick to it that I'm not aware of but no matter if it's inside or outside this material works incredible in cold weather. In recent times I'm finding it's more beneficial to just camp in the shade and try to funnel the wind into the shelter. Thanks for the comments and thanks for watching Dennis
I think to follow the canteen design, the wet blanket should be under the tarp. Evaporative coolers work great in our California dry desert, but not when humid.
We have so much humidity here in Georgia that this may never work here.
@@Reallybigmonkey1 Oddly enough, he said he was located in Georgia.
@@Reallybigmonkey1 OK I'm a moron.
Or just lose the tarp altogether and then you've got old school air con with the breeze coming through the wet blanket or wet sheet that's not being stopped by the tarp..? Which of course is dependant on there being a breeze of some sort of course. Just think of breeze/air hitting your sweaty shirt..cools you down.
And yep, look up 'tropical roof tent australia'.
I was pondering the same question on the heat difference between the dark side and reflective side of a tarp out in direct sunlight. Awesome video you answered my question!
Fantastic to hear that Jesse and I'm glad you liked it!
How accurate are your thermometers with respect to each other? There could be some plus or minus differences between the thermometers themselves.
They all read the same when laid in the sun.
I dont think that little distance mattered since it wasnt in direct sun.
It’s so good to hear a guy that talks like you also acting smart at the same time. Like how you knew that the sun changing positions would compromise the results of your experiment. Saying that like a hillbilly only makes us look good.
Lol, thanks Chet!
Very interesting video Dave. I really enjoy watching all your vids👍
Thank you Steve!
I want to add one more comment Dave. I just feel really good when I’m watching one of your videos. You’re the go-to channel that I want to watch when I want relax. Don’t change your intro greeting. I do some video work both for my enjoyment and also for TH-cam. I know how much work goes into what you do behind the scenes with editing and such. Anyway, Grants Pass Oregon is watching and I look forward to the next one. Later, Steve Arnold
Excellent analysis....thanks for the work Dave....I was surprised by the results
Thanks Curtis! I was honestly surprised too
I gotta leave in 40 minutes, so that gives me.....40 minutes. 😄
Lol, thats me thinking out loud.
@@Reallybigmonkey1 It made me laugh, thanks!!
@@outdoordauber It would have been funnier if Dave stated that he had 45 minutes for the experiment but 40 minutes before leaving.
That was really funny
@@Reallybigmonkey1 you always make me smile and laugh. I like the way you think
It's not a horrible video Dave. I watch ur videos cause u give a lot of knowledge away for free . Things u could charge for but u care about ppl learning an getting out in the woods n to have fun. U are my favorite youtuber to watch. Thank u for ur the effort u put in n the enthusiasm u have while making these videos. Hope all is well with u n Nick.
Thanks Marcus! I love making videos an I love getting people to get out in the woods. Thanks for the comments and thanks for watching brother
I was surprised that the exterior facing, reflective tarp not only wasn’t cooler but was actually hotter inside. 🤔
Same here Jim. That shocked me.
I suggest we call it the "baked potato effect" LOL
@@Reallybigmonkey1 White is the only shade that would repel heat.
BIG 👍👍’s up!!
Here’s another headscratcher for your consideration:
How about that 2d tarp ( with the air gap ) hanging over the tarp with the black jungle blanket on it ??
Here’s a thought on a passive air conditioner for your tent - as air travels through a large opening and narrows down to a smaller exit opening it cools off ! Same thing happens when you pucker your lips and blow warm body temp air into your hand - cools.
So how about a hoop about 3’ diameter and 3-4’ sheet of plastic drop cloth in the shape of a cone Large end attached to the hoop , small end a small hoop of about 10”. Use a couple of sticks or walking sticks to prop the hoops up To capture the air flow. Might need a tarp to block the sun heating the air in it but it should move fast enough that it may not be a problem
I’ve never tried it but I did see a TH-cam where a family in Africa used a 1/2 sheet of plywood, drilled a couple line of holes so that they could stick the neck of a liter plastic soda bottle into it . The bottles had their bottoms cut off and the plywood was than nailed over a hole they. It in their wall for it. And it worked !!
Thanks Ken! Several more experiments need to be done along the lines of what you mentioned. I really like your air catching cone idea! That needs testing too
19:05 I did this same experiment! The double tarp, with an 8 inch air space, gave me 11 degrees cooler temperature. I got the idea when I saw an old man build a lean to cover his camper leaving a one foot air space. He swore it made his camper cooler. Of course, I had to find out for myself. Enjoyed the video, as usual!
Really? That's a huge difference! Was it in the sun or shade?
@@Reallybigmonkey1 Direct sunlight. I couldn't believe the old man with the camper was right. I went back to the old man's house a couple of weeks later and thanked him for the tip.
@@Reallybigmonkey1 I did do something a little different from what you did. The top tarp was about two feet wider than the bottom tarp. I made an 8 inch gap in between the bottom tarp and the top tarp. But the top tarp had the sides flared out more than what your showing in your video. It may have helped the air circulate more. Just thought I'd mention it. You may want to try it.
Thank you Dave I learned a lot from this video also I want to try to clarify to myself what you said was no matter what you would get a 2ﾟ difference no matter what and I think what you meant was between shelters but what I discovered or noticed in the video is you get a 10ﾟ difference from outside temperature to under the tarp if you go with a double tarp and that is crazy awesome. Thanks again Great video
Good to hear that Steven and I'm glad you liked it. Yep, hard to beat a ten degree drop! Thanks for watching
It has more to do with the ground being heated and air movement. Think of it like the freeze line in winter. After a long time below zero, the ground can be frozen 1'-2' down. So on a nice sunny day, the surface may heat up but it will still be cold several inches below the surface unless you have something that compounds the suns weak heat. So ever though you are in essence blocking out the sun, the ground will still be releasing heat for much of the day. The more sun great is blocked out, the quicker the ground cools and this will even cause air movement, further cooling the ground.
In the trees, the ground never heats up. The tree tops heat up causing air movement changes to further dissipate heat.
Great info! That makes sense
@@Reallybigmonkey1 Great video. Love 'em all. So next experiment can you try different scenarios of cooling the ground (as mentioned in above comment) and keeping it cool in a bushcraft adventure.
Related, insulated shelters may be expected to cool slower in the evening.
Great information. It made so much sense to me to use an insulation factor to keep cool. I actually have used a Grabber with a silk quilted blanket in white. Cools very nicely.
Thanks Gina! I'm glad you liked it. I need to further experiment with this. I like your white silk quilt idea!
Great idea my Brother! Thanks for taking the time to share it Dave.
All The Best....
I'm glad you liked it and Thanks for watching Brother!
Dave...i enjoy your videos most of all! They're educational for all ages that do not know about "bushcraft"...which... Thanks to YOUR channel, & others... it's making a comeback! I like how you keep scientific notes. This is GPD
Thanks Mary, I'm glad you like what all I do. I love influencing others to get out and do things. Thanks for watching
I’m very shocked that there wasn’t that a bigger cooling effect using a double tarp. Obviously, placing a shelter in the shade would be optimum. Great job Dave! Thanks for all your videos. -Stephen, Ohio
I was shocked too! Yep, nothing beats shade. Thanks for watching Stephen!
Thank you so very much for taking the time to experiment with different setups and ways of doing things. It really helps. It's like watching bushcraft, and a science show in one. You're the MacGyver of the bushcraft world.
You're very welcome and I'm glad you liked it Richard!
For arctic camping, they use 2 or 3 layer tents with an inch or two of air between the layers for insulation. It would be interesting to know whether arranging your test with layers of air between would keep things cooler.
Right. Good information and thanks for sharing.
Yes it does,it is done in a desserts to,'trapped' air insulate in cooler as in hot climate
Like a thermos,put something cool in it and it stays cool
Put something hot in it,and it stays hot
they don't really, because the overall gain in insulation is outweighed by carrying all that extra weight. Traditional lavu's and tipi's are always single skinned, some modern ones have an inner tent but this is mostly to keep condensation and bugs out. If you want insulation in the arctic, we use snow. It's free and abundant and is the best all round insulator that you can get up there.
That's worth testing
I loved this video! Interesting results. Glad you put the thermometer outside as a control.
Thanks, I'm glad you liked it.
I love watching your mind work. Another informative and entertaining video. I don't know if I'm setting up 2 tarps for 2 degrees but makes me think about the possibilities. Keep up the good work and see you in the next one!
Thanks. Ah well, as long as an extra tarp aint too heavy it might be worth a few degrees. I'm glad you liked it. Thanks for watching
Would more tarps be more cooling?
Nice looking neighborhood Dave. Your lawn, plants and house look really nice. You have made it in life. The American dream is real. Enjoy my friend.
Thanks! Yep, it's a nice clean crime free area. I'm the only noisy messy resident here. Lol
Great experiment my friend. Excellent information to know. Never would have thought of trying to find out if there would be any temp change. I'm like you, I just don't camp in the sun.😁👍
I'm glad you liked it! I've always wanted to test this. Thanks for watching
I like the video you did with the cool air off a creek tubed up to a tent. That made a great difference. Thanks. For the experiment. Sun bad shade good. 🤗
Thanks Marie! That was an excellent set up and for my area? That's the way to go. I feel sorry for those campers that have no spring fed creeks or shade trees. Thanks for watching!
What about a white tarp?? Would it reflect more heat?
Did u watch the video
@Timothy Mckee yes
I think so. Too bad no one makes a white one that I've found
Never stop doing this. Your videos are really good and apply to the common man/woman.
Thank you Aaron! I hope to do this for a long long time!
I wonder if the humidity was a factor. It would be interesting to see the results in a low-humidity environment, like the desert southwest.
Could be, we have super high humidity here
It wouldn't be much better in the desert if their was a breeze. The constant flow of hot air across hot sand would not allow for the heat to be disbursed. In the dessert your back would have to be to the wind and the outer tarp would have to be further away to cad a shadow. Also you would have to remove about 2 inches of top sand since it holds heat very well. Don't use sand for a wind row because all you will be doing is allowing for hot sand to be carried back in. The break tarp would have to be almost ventricle and cast a shadow past the lean to to create any real change in temperature.
Another excellent experiment from Dave! I never would have guessed that outcome. Thanks Dave!
Thanks, I'm glad you liked it Jeff! The reflective side out results shocked me!
Best part was scaring the cat with the hose 🤣
But seriously, very interesting. I didn't expect any of those results. Especially the reflective tarp, I'd have bet my last dollar that would have been the coolest shelter.
Dave is famous for loving cats! Check out the wonderful parody by Brooke Whipple of Dave's channel a couple of years ago! Brooke is just about the Queen of Bushcraft Comedy, as well as being a two-time pick to contest the ALONE challenge.
Lol, I'm glad you liked it. Honestly, the reflective tarp turned outwards was a shock! It heated up like I never expected. Thanks for watching
thanks for info...I live in the Mohave Desert, today was 112F and I've thought about it multiple times, what if the truck broke down, no A/C, no one around and we had to keep the sun from cooking us...? Just having water is not enough, though it may be the difference of life or death. I am also a steel building erecter. Two years ago we had to install the roofs on 3-326' x 90' buildings, galvanized metal over insulation with foil facing upwards. We baked in the 110-116F temps. I can tell you from that experience the sun exposure makes a huge difference. Inside the buildings without a breeze it was noticeably hotter than outside, but did not feel as hot as being in direct sunlight. A breeze helps a lot. What made the most difference on the second building was a battery operated, bucket misting fan. Cool off a few seconds with it every ten minutes and it was amazing how much better things were. If I had to guess, 30F cooler while cooling down. 5 of us went through 10 gal of water each day minimum.
So my thought mixed with experience and your experiment hints at making a gravity-fed, or spring-tensioned-pressure mister used below a two layer shelter really could cool things off a lot. Hmmm, wonder if someone sat on a bladder if it would be the pressure needed to mist? I got work to do...
Thanks for the comments. I love your idea for a mist maker. I'm sure that will work great in the desert but probably won't here in Georgia due to our constantly high humidity. In certain situations I can see where it might help. Thanks for watching
Hey, Dave, stay away from wet blankets in general, they're depressing. Yeah. Great video!
Lol, thanks for watching
David that was a great experiment. I do believe I will carry to tarps for now on....... lol.....
I want to be as cool as I can. Unless there's a lake near by then I'm cooling off in it. That's why I like camping in the spring or late fall. So much cooler.
Have a great weekend,
Chris from Missouri
Thanks Chris, I'm glad you liked it. Hard to beat Fall or Winter camping! Thanks for watching
Thank God! I was going to call a search and rescue! Glad your back!
Lol, Im still here John! Thanks for watching
This video has solved lots of What if you and This way is the best . Thanks for your time it has helped a lot of us .
I'm glad you liked it. Thanks for watching DC
Look up solar chimneys. .
In the 1860s the military had a double wall teepee.
Thanks for sharing your videos.
Never heard of that, I'll look it up. Thanks for watching Willy.
Another outstanding video. Very interesting and informative. Thanks for sharing it, and I'll be looking forward to your next un
Thanks William! I'm glad you liked it
The reflective side will reduce the radiant heat but not effect the convection heat. The reflective tarp was in the middle collecting the convection heat from the other two tarps leaving the results inconclusive. It is same when a person in between two other people will be warmer due to the convection heat transfer. This does not include contact because that would add conduction heat transfer.
Try the video again and put the tarp on the outside.
Great video though.
Makes sense Trevor, thanks for watching
Trevor Cassell
I was thinking the same thing about the middle setup being affected by the side tarps. And also one end was near the tree casting a shade on the ground.
Dave, shade is the key. Thanks for your hard work at your job and the hard work you do keeping us informed and entertained!
I agree, nothing beats shade. Thanks for watching Steve
In the eighties, a camera company did a test on which camera bag kept equipment the coolest. The lighter colors, were cooler for the first hour but after 4 hours in direct sun, they were all the same temp. inside the bags.
Very interesting Carl!
Thanks Carl!
@@Reallybigmonkey1 You said in vid that you didn't understand how moisture cools. Have you noticed that when you get out of the shower, that your body is cooler until you are dry? Notice how when one soaks your canteen liner, the moisture is touching the product. The reason swamp coolers are not used in the south is because the humidity is too high for them to be effective, I think the next test would be to use a tarp for shade and the the damp blanket on the other side and ends to keep warm air out. Similar to keeping cold air out in winter.
Makes sense Carl
Great subject and handling on your part. Ron Hood covered this in his Desert Survival video., and the two tarp system is in official survival manuals (as is digging a pit to shelter in). There was a part in his video where he showed that using black material actually shielded the Sun's energy better than lighter material, hence the reason why the Bedouin dress in black. I'll have to go back and see the layering method though. Thanks for all your hard work and dedication!
Thanks Jeff, I'm glad you liked it. I believe everything Ron Hood taught but Im amazed at how many arguments folks get in over white or black for sun protection. Mors also says black tarps are better. Thanks for watching
Put something down and a cat will lay on it!!! lol
A very smart and informative test Brother... Really good to know how
all these materials act in the hot sun. Thanks for doing the hard work for us!! lol... Cheers!
Lol! That is so true! I'm glad you liked it. Thanks for watching
Great video Dave. Thank you for the time you take to make these informative and entertaining videos for us. Your dedication to your channel and us hit home when you said you had to be to work in 30 min and there you were working on the video instead of relaxing before heading into work. Not so sure I could be as dedicated so thank you for your time and creativity.
Thanks Larry, I'm glad you liked it. Lol, the curiosity of these experiments had me working up to the last minute! Thanks for watching
"Fun with science.... and cats!"
Much learned - and I learned that where you live it is damn hot weather!
BUT it is not a good shelter, the cats refused to use it :(
Lol! I'm glad you liked it. Thanks for watching
Interesting results and a heck of a lot of fun to watch.
I kept thinking there would be bigger differences.
Like you said find some shade.
Thanks Ken, I'm glad you liked it. The results amazed me!
great job. If we just think why these tarp set ups changed the temperature. If you think about a tree with all of the sun light being filtered out, yet allowing the wind to move through the trees, to a point the deeper the canapé the cooler it is under the tree. I wonder what the temp was under the trees on that day? I think that is why the dual layer tarps worked better. I wonder what would happen with 4 layers and air spaces. Another idea is evaporative cooling, the old refrigerators made with burlap. With air moving through water at the ends of the dual wall tents if that would cool it down, kind of like a swamp cooler, or does the air have to be forced through with a motor to get the effect you would want. Two more ideas, I remember a place in the southern desserts of Utah, by eagle mountain a tall cliff. It acted like a sail and the air would move down the face of it, into a crack that was shaded. If you sat at the bottom of the crack, the air was cooled as it came down in the shade, and was cold. I didn't measure it, but it was like 120 degrees in the sun but at the base the air felt as cold or colder than air conditioning, I would guess 50-60 degrees. Like a refrigerator. We also know if we dig in the ground below the frost line the earth stays at a constant 50 degrees. Like in the back of a cave. If you found a natural trench and with rocks and sticks create a 30 foot tube you could cover over with dirt and then create a draft to go through the tube and into a dual wall tent, as the air moved through the tube it would be cooled and create an air conditioning effect. Some ideas to try or think about how you could facilitate some natural occurrances.
Fantastic input and you've given me a lot to think about! Thanks for watching
Great experiment Dave thanks for taking the time to do this and share your results.
Thanks Chris, I'm glad you liked it. Thanks for watching
I’m gobsmacked that the reflective tarp would reflect the sun but it didn’t. 🤷🏻♀️ loved the video Dave very interesting. 😀😀😃😄😄😁😁
Out of all I learned on this video that was the biggest shock of them all to me. I could have swore it would reflect the heat away. Thanks for watching Michelle
@@Reallybigmonkey1 It seems like one is to mistake "reflective side" with "side mirroring all wavelength". I would bet that a mirror made of metal would also heat up incredibly since the sunlight contains, I dont remember exactly, 1/2 of its energy within the lower (infrared) spectrum. Strange enough, if the reflecitve side is to keep one warm, the infrared part SHOULD be reflected back. But maybe just on a small bandwith of wavelengths? Tempearture of sunlight roughly 6000 K, temperature of body skin roughly 300 K ... :)
I'm really curios how the temperatures would have evolved using a light blocking WHITE fabric (maybe made of cotton, not plastic). I believe it would heat up only slightls in opposite to a metallic mirror (compare car heating up in the sun...), even thouth a fictional metallic mirror would reflect all human visible wavelengths!
So you're suggesting inner layer white cloth outer layer reflective material?
@@Reallybigmonkey1 No indeed I would suggest a white cloth outer layer and the inner layer - I dont know! Maybe just this one layer. But light-blocking white. There ar curtains made for blocking light (almost) completely. That ones in bright white. Propably won't make a good tarp material, could be hard to keep it clean :-D But for bushcraft sience, why not!
I sure love your videos!! Thanks for making the time to do them I really enjoy all you share..thanks again, I've missed you while you were gone very happy your back on!
Thank you Rebekah! I'm happy you like the videos that much!
You should try a white blanket. And black blanket. Blackbattracts sun while white or light colors should help reflect i worked outdoors alot. And found lighter color clothes keep me cooler
Some say white, some say black. I need to test both colors on tarps and on blankets side by side.
Man brother... In a world of bright ideas and he said / she said, it is nice to see where the rubber meets the road... Thank you for taking the time to set that all up and share your results with the rest of us... And hey, perhaps we all learned something in the process... Excellent video bro... Thanks again... Peace.
Thanks Brother! I had some theories on what would happen and none of them were correct. Lol. I'm happy you liked it and thanks for stopping by!
Evaporative cooling. The reason it works. Water or water gas (humidity) can change temperature at a very steady rate. Add, lets say. one unit of energy, and the water temp goes up one degree. One to one. But,,,, when water changes phase,, from liquid to ice,, or liquid to vapour,, the change needs or releases lots of energy. Your experiment involves taking water from 212 liquid,, to 212 vapour. Same temperature , but liquid to vapour. Now to be clear, evaporation takes place at all sorts of temperatures,, but on that little bitty scale of just one molecule,, the change really is boiling water. The energy required,, or in your case absorbed. So,,,, if it needs one unit of energy to raise the water temperature one degree,,, between 32 degrees, very cold but not frozen water,, to bring it to boil at 212 degrees you need 180 units of energy,,, 180 degrees change,, 180 units. BUT,,, to move the water just a little tiny, tiny bit to 212 degrees vapour,, just 212,, to 212 but liquid to vapour,, you need 1000 units of energy,, same temperature,,, just to push it past the phase change.
Now the really cool part of water,, is it does not have to all be at boiling. If the sun kicks just one molecule out , if just one molecule evaporates,, it MUST steal some energy from all the liquid around it. When it steals that energy,, it cools the surrounding water. The high energy molecule,, vapor steam,, has to get that phase change energy from somewhere,, so it just takes abit from the liquid around it. You end up with a cooling effect.
Same sort of thing happens when water changes to ice. Water gets colder and colder,, one degree at a time,,, but when it wants to shift from liquid water at 32F to frozen water at 32 F,, same temperature,, you have to take 8 units out just to shift it from liquid to frozen. That is why some ice in a cooler can keep things cool for so long. It is not just the cold ice,,,, it is that jump in changing the ice into liquid.
Thank you for the explanation my friend!
i use the double tarp with an air space often and we can notice that 2 degree difference, i also feel like it blocks more uv rays or something? out here in the Mojave desert one tarp still feels like you are burning under it, but two tarps with an air gap makes a big difference and is much more comfortable. love watching tarp vids and really enjoy seeing you doing these experiments. thx for keeping an old topic fresh. you rock!
Two tarps absolutely helped. What got me was how the air temp was 88 but under the tarp was so much hotter! Just goes to prove what UV rays can do.
In wanted to see double tarp setup with air space and wet blanket as bottom part of pup setup ...
Soo you would have shade and evap cooling....
Love your videos Dave ...
Exactly what I was thinking. Rather than luging a heavy blanket, I think a wet bed sheet would do the same.
Thanks for trying this out Dave!
I am planning on more testing off camera. I'm glad you like the videos!
I thought about a wet bed sheet at first but then figured the thick blanket would hold more water longer. Thanks for watching!
Love this! So many people go with overly comnplex or insanely expensive solutions, when there are so many good ones, if you just apply yourself.
Awesome little life hack that I put to the test recently...
I was camping at high elevation, wet, and it got down into the 30s at night. I was sleeping in a hammock, so the cold was definitely going to be a factor. I bought one of those reflective sunshades for the front windshield of a jeep wrangler rubicon (I think it was about $9 on amazon, and only weighs about 4oz) and put it in my sleeping bag with me. I stayed so warm that my sleeping bag was unzipped all night, and I had a foot sticking out of it.
Thanks! I'm glad you liked it. Very cool you had that pad it worked! Thanks for watching
Now if you had an idea to get rid of humidity that would be brilliant....
I use a modern power pack to work a fan to increase evaporative cooling. At the margin, it makes a difference between relative comfort and discomfort for restorative rest.
If I could get rid of Humidity I would be a billionaire!
Great content man. Thank you for helping all us regular folk survive SHTF! And I also have a great time watching you too, its good fun.
Thanks, I'm glad you liked it. Thanks for watching
Great video Dave. Maybe the pup tent configuration was slightly better overall as opposed the standard lean to tarp.... it's a cool 70 degrees here in Scotland. I'd swap that for your backyard ⛺🤠!!
Thanks! I'm glad you liked it. I would love some 70° temps here!
I’m glad I’m not a betting man Dave because there is no way I’d have thought the reflective side out shelter would have been the hottest one. No way. I live in Texas where the dang asphalt boils in the summertime. I really appreciate this kind of information to help me keep my shelters cooler. Every single degree matters when it’s that stinking hot. Great information brother. Thanks for sharing.
Same here Jack. Man them results shocked me! I'm glad you liked it. Thanks for watching
There is another result of this test!
It is reasonable safe to say...Dave is changing clothing every day. :)
Lol, you are correct!
Dave this is why I watch your videos, man we can all learn a lot. Interesting results for sure. I figured that with the silver side out would heat up the sleeping area more. Double tarps, lets face it cooler by 2 or 3 degrees does make a difference when staying under a shelter for comfort during the heat of the day. Well done my friend!
Thanks Daniel. Man I was shocked. I thought for sure that set up would reflect the heat away. I guess not. 2 to 3 degrees is better than nothing! I'm glad you liked it. Thanks for watching
30ºC is about as much as we Brits can take before we die of heat exhaustion.
It works in reverse too, winter where I am is 25c overnight....22 or 23 we are breaking out winter woolies thinking we are going to freeze!
The reason I hate seasons...Somebody keeps messing with the damn thermostat.
I hear ya, Down south our summers stay between 32C and 36C for two to three months!
@@Reallybigmonkey1 Summer max 38C, Winter -2C. Let's split it down the middle, shall we? 18C all year round. Deal?
:D
_Oh and Carol, stop touching the damn thermostat every two minutes. Put a sweater on or something_
Awesome test there Brother! I too, was caught off guard by the reflective side not reflecting the sun rays and heat any better... thanks for over taxing Your Brain on this one...ATB to you and Yours.
Thanks, I'm glad you liked it. Man that reflective test shocked me! Thanks for watching
Why is it that I get seriously happy when I get a notification from my buddy and brother in machining Dave. Makes my day each time. Keep cool and stay safe man.
Thanks Brother!
Thanks, Dave! I think this will be very helpful when I am stuck with a full sun campsite because no other ones are available.
Fantastic to hear that my friend!
I’m so surprised that the reflective side facing the sun actually made it hotter! I thought that’s what you were supposed to do in a hot climate with those grabber blankets! Great vid.
Oh I was surprised too! Every winter when I used one near a fire I almost always got the comment "Turn it outwards for summer time" I'm glad you liked it. Thanks for watching Amy!
You crack me up... I don't know if it's because I've watched you so long or not, but I was wondering about that double-walled (pup tent) tarp configuration with the air space when lo and behold you went and did it!
Thanks for another great vid!
You are about the only reason I have for visiting TH-cam these days.
Lol, we think a like! I'm glad you like what all I do, Thanks for watching
In the desert we used canvas with a white liner on the inside, it was cooler than just the canvas. In the winter we used the same setup to keep the heat in. On my shelter now the two layers of canvas is cooler than one layer of canvas. Thanks for the test, take care.
Im guessing its because the canvas is thicker and heavier? No way UV rays can get through two layers of canvas but it can a poly tarp! Thanks for watching Quinn
Amen brother it’s definitely hot here in upstate SC too. Great ideas. I remember reading somewhere that either the Greeks or romans would hang wet curtains in their windows for a type of air conditioning. It’s the same reason that we sweat when we get hot for the sweat to evaporate and cool us off. Always enjoy watching your videos. Keep up the good work.
I need to test that. With our humidity tho, will it work here? I'm glad you liked it. Thanks for watching James
I've liked all your shows, and found this one of particular interest. However I'm curious about how much air flow will effect temperature? Which way was the wind blowing? If any. I think if the wind blows in from the ends the temperature inside the "A" shelter should be lower by eight degrees; if not more. While not much more than a two degree variance if the wind blows on to the sides of the shelter; without a vent in the peak of the exterior layer.
Thanks Jenny. Maybe I'm nuts but it seems to me like winter is the only time where wind direction is constant. In the summer it seems like it blows all around constantly changing direction.
Excellent test! Enjoyed watching your experiments. Thanks for your efforts in making this video.
Thanks Mona, I'm glad you liked it.
That was so interesting ..thank u for that example.. you took your time to set up each scenario that was very kind of u to do ...i remember camping with a tent and it was so hot and i grabbed what i could and wet it and put it on top to cool it down a little but it didn't do a great difference ...now i know why and like u said dont ever put it directly on the 🌞 😆 ...well mine was on a poor little shade tree never again ...lol once again great information .god bless you and your family
Thanks, I'm glad you liked it Maria. Yep, nothing beats shade! Thanks for watching and may God bless you too!
Excellent experiment. Trapping dead air space in between, would be helpful for an inclosed structure with a high ceiling. If temperatures are really too hot one could camp next to water or make your camp at higher altitudes. Stay cool - Enjoy your weeks end. Thanks for another fun and informative video, Dave!
Thanks, I'm glad you liked it. I dont know if its a point of enclosing air or blocking UV rays. Maybe a little of both? Thanks for watching
One of the best videos I've seen. Not with a bunch of BS. Just facts about your experiment and the results. In desert survival, we were taught that 6 inches above or below the desert floor was cooler. I'd like to see the same experiment with the temperature checked at that height. Again, excellent job.
Thanks Ken, I'm glad you liked it that much. I never knew that about that desert
This is a COOL experiment and video . Always great to see you happy , healthy and doing your thing . My 65 year old wife - "He is so adorable with lovely eyes .... and that voice" .
No... you can't have her . She's filthy rich and helps me reload ammo .
All the best Dave and thanks for your video .
Lol, thanks! I'm glad you both liked the video!
She's never called me adorable . Congrats bro .
Hi Dave. Thank you so much for taking the time to do all the experiments and pass on the results. Stay safe ATB Nigel
Thanks for watching Nigel!
This test was great 👍 thank you doing this and sharing it with us. I enjoyed and learned something! I thought for sure having the reflective side out would have been cooler. Lol.
Thanks Jon, I'm glad you liked it. I was shocked at how that reflective side out turned out.
this is great video! it is end of summer, and I am in great lakes region. I would love to extent the camping period to colder days with my kids. Do you have any good way to heat up a tent? in specific, I only have a 3 season costco family tent. so it is really not a good idea to have fire in the tent or really near it.
Thanks! I'm glad you liked it. As far as tent go? If it's car camping just insulate the walls with blankets. If backpacking them bring good quality down bags
Great video.. thanks! OK so two thoughts...there's variables to consider.... all may be under sun..but you need to consider air flow. Also I had a thought.... add another one over the original tarp tarp but 5 inches above it. That top tarp will absorb heat from sun but airflow will flow between 2 tarps cooling down under neath. Like sitting under a tree with a breeze branches protecting u.
Hard to say without testing but that's a good fault
That tree your ropes are tied to looks like a great shade tree! What tree is that?
Also, you could try a damp blanket suspended under the tarp to get evaporative cooling. Just make sure there is air flowing through and you should be able to get much better cooling underneath.
I think it's a cottonwood. Top or bottom I'm not sure if the evaporative blanket works in such a humid environment. Thanks for watching
Thanks for this experiment, what was the outdoor starting temperature?
You are very welcome Peter and I'm glad you liked it. I honestly can't remember the temps on this day because it was filmed in 2019.
Absolutely amazing study! AMAZING!! Living in W Central FLA on the Gulf of Mex I've wondered if there was a way to reduce this demoralizing heat and humidity....and by your last experiment it was a full 10 degrees cooler than the thermometer DIRECTLY in the Sun. Learned a lot.....a LOT! Thank you!
Thanks Scott, I'm glad you liked it. It amazes me what all can be done just by setting up plain ole gear in differing ways! Thanks for watching
We have a few shade trees in the Arizona desert, but they lose their leaves to reduce evaporation. (that's why their bark is green). So thanks for doing this experiment. It means that if the car breaks down by the side of a isolated road, pull out a couple of tarps and get some better protection from the sun. ❤🌅🌵
Im guessing yall dont have many shade trees there? Yall also dont have high humidity so the techniques that work here may not work there or vice versus? Thanks for watching Suzi
Great video David
The evaporation based system I think only works on small system, a water canteen etc
In the heat you need height inside the tarp and open ends so the hot air can rise and any wind carry it out of the tarp
If you want to cool down an area with water the water mist system is best used but not practical for a tarp shelter
In Europe and I would assume in hot climates in the US they paint roof mounted water tanks black so the sun heats the water up inside so later afternoon early evening you can have a warm shower before binner.
Buildings are generally painter white and white cars are used in hotter climates as the colour white reflects the infra red rays better.
All the best and take care David
Thanks, I'm glad you liked it. I'm out humid climate I doubt any evaporative system will work. Thanks for the comments and thanks for watching
Enjoyed watching this experiment. Saves us all from cooking ourselves under the heat reflector blanket . Nice to know whether it actually works or not.
Thanks Susan, I'm glad you liked it.Right now the only thing that works is shade. Lol. Thanks for watching
@@Reallybigmonkey1 viewing from Ontario Canada where the early evenings are already cold.......so I'm apt to be turning that shiny blanket towards myself pretty soon with an emergency blanket if my solo hike/camp on the Bruce Trail goes wrong LOL
Hey Dave,
I know you did this video about 4 years ago or so but I like to rewatch your videos every now and then. And I am wondering what if you put the wet blanket inside of a tarp? This would be more like the canteen cover that way. Just a thought.
Hope you still get comments on your old videos .
Thanks
Hello Terry! I haven't tried that wet blanket idea but I think it would work! Thanks for watching
Great video! Have thought of this too since wife and kids prefer staying on trail where we tend to find open sun.
Only theoretical addition to the test would be a hammock simulation for off the ground sleeping, but I don’t think it will matter with good airflow. Also in practical terms, when I can setup a hammock I am naturally going to be under shade from trees not in open sun.
Thanks, I'm glad you liked it. The beauty of a hammock is two fold. Air under you and shade always on you! Thanks for watching Sean
Hi Dave. Glad to see you got your lawnmower working. Your grass was needing it in the last video. Ha Ha I noticed. On your tarp experiment, you might try putting the moving blanket under the tarp. I think that is were you need the insulation. I do like how you try different and new ideas. Give that a go. Personally I camp under a good tree covered area with the open end facing the breeze. On a lake of course in the summertime.
Lol, Nick cut it. Funny how if you think about it, a tarp may bounce off rays but a blanket may absorb them? Nothing beats shade. Thanks for watching
I enjoy your videos, sir. That last part of the video you, you had the double tarp set up, with about a 6 inch air gap, what if you increased that to about 12 to 16 inches? What kind of temperature drop would you have then?
Thanks Daniel! Another commenter said they used a 12 inch air gap and it made a huge difference! Mine just wasn't large enough
Fascinating! I started wondering what if there was a tarp that was reflective on both sides. I wonder if it would be cool then?
Interesting thought, I'm not sure but from what I've seen anything that got any silver at all winds up pretty hot in the sunlight.
Hey Dave just a thought but before you put the black blanket on the trap the temp was 90 and after you put the black blanket on and waited 30 min it went up 7 degrees. So using the tarp with the green side out was in fact the coolest of all you tried. Great video!
Yep, made a difference. Could you imagine what an all white blanket could do? I'm glad you liked it. Thanks for watching John