Air Powered... Propeller?
ฝัง
- เผยแพร่เมื่อ 2 ธ.ค. 2024
- Following on from my compressed air piston engine, I tried to find a simpler method of converting pressurised air into usable thrust for a model aircraft! But is this a solution or just a stupid idea?
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Put it underwater to check if it leaks!
And make more parts and put more ads before your videos so I can support you without paying(student budget ;D )
@@felixbaum2180 nah after so people can chose to or not to
@@charadremur333 Even if its at the start you can still choose to not watch it.
@@BlackSlimShady but if its at the end he can let you watch the video and watch ads at the end after you have decided whether or not you like the video.
@@charadremur333 you shouldn't watch ads only if you liked the video. That's like saying you should go to the cinema. Watch the entire movie. Than only buy the ticket if you enjoyed it.
Hi Tom. One of the things I like about your videos is the fact that it's REAL; that is to say, genuine. You explain your thought processes very well and then without a lot of actual production, you assemble and test an item. Excellent. I like that way of doing things. It cuts to the chase and proves/disproves a point. I personally would be happy to see as many videos as you can practically manage, so the production in stages (weekly) seems to be my preference. A couple of other things if I may.
1) Pressure testing your bottle is wayyyyyyy safer if you fill the bottle with water. As I know that you know, water is (virtually) incompressible, but will communicate the pressure applied uniformly over the bottle and if the bottle does decide to let go, the explosive force is not as dramatic. Maybe 12yrs ago, I made a similar bottle to yours to prove to my twin boys that air does weigh something. My compressor can reach 120psi and I tested as described to that pressure.
2) Using the expulsion of air to then drive the propeller is (again, I know that you know) relatively inefficient, but a certain guy called Hero did something a bit similar some years back but with steam. :) Also, you may be aware that in the very early 50's a British aircraft (ahead of it's time - again), called the Fairey Rotodyne used rotor blade tip combustors supplied with compressed air up the rotor shaft and out along each rotor blade. Check out: en.wikipedia.org/wiki/Fairey_Rotodyne
3) Probably (definitely), not a good idea to hit ceramic bearings with a hammer or any impact device. Pressing is wayyyyy better :)
4) I am/was, an electro-mechanical engineer who studied aeronautical engineering and I have a (too) small workshop. I know you make a lot of stuff from 3D printed plastic, and I get the feeling you may not be a million miles away, but if you need some metal parts made, pm me.
5) Finding many ways NOT do something can sometimes be fun and enlightening, so carry on I say.
Regards Mark in the UK (Buckinghamshire)
You've heard of propellers moving air.
Now get ready for:
*Air moving the propeller.*
I think there is no comparison to compressing air with pistons vs. surrounding air (=there's very little). There's a real problem of getting enough "push" to the propeller with concept like this...
Air moving the air moving propeller
He should try a whoopee cushion.
In soviet Russia..
air moving the propeller, moving air
"this was my breakthrough"
*falls apart*
2:52
Breaking news on this smashing revelation. The pieces of the puzzle are really going places.
hahahahahah reading this before i watched it made it 10x better xD
"This was my breakthrough"
SCREEEEEwack
2:40
💀💀🤣🤣🤣
Well it actually was his *break*-through
Interesting concept ! I think your system produce too much torque instead of running speed. You have 4 exhaust tubes that add no rpm compared to 3 or 2 but torque and they are too long. For the same exhaust speed of the air, the rpm is lower. I would advice to shorten the 4 little tubes in order to increase the rpm produced with a certain amount of air. Also to delete 1 or 2 tubes. I don't think the loss of torque caused by this modification would affect the proper functionning.
Moreover, we can see air flowing out of the system without passing by the exhaust tubes when you turn it on 12:49
I had just about the same idea. My idea was a bit different still. The tubes that expel the air may not be needed to lessen. The smaller exhausts inside the turbine type print, although, would benefit the build if there were less. EX: If there were 2 air expelling areas inside but still 4 tubes being used to expel the air, and there were no air leaks, there would be much more run time.
The "nozzles" are just the pipe he had available, smaller diameter nozzles might give more torque for reduced air consumption.
I agree. The long nozzles may reduce the rotation too. Bring them in closer (figure skaters arms when spinning). Two may work with an actual nozzle ( not an open pipe ). As I see it, it will increase the time for pressure reduction and possibly offer more RPM. How about a 2L bottle? And the internal system leaks need to be addressed. Try again! I would love to see another attempt.
Just by hearing it spin you can tell a lot of the air is not being used, definitely sounds like there's a leak inside the turbine evidenced by the fact that it can't start spinning on its own.
Seems like not enough effort was put into this project honestly.
My first thought when seeing the thumbnail was: Flying swastika
krass. erster kommentar der das erwähnt, direkt deutscher. ich glaube das deutsche in mehr dingen hakenkreuze sehen als jedes andere land, einfach wegen unserer geschichte. irgendwie witzig
@@nob0dy27_ Witzig kann ich es nicht finden.
@@GGGNVideos ok und
That was my immediate thought too.
Jawoll ja
"Here I have a ceramic bearing, so let's hit it with a hammer. That will work"
And yet it was the polymer shaft that broke, not the ceramic bearing.
everyone can do dumb stuff.
not everyone can do smart stuff.
somehow more jarring to watch a smart person so something stupid, isn't it?
I think a substantial amount of air escapes between the rotor and the top of the valve. To improve the airflow through the brass tubes, you could try to add a sealing rubber skirt. en.wikipedia.org/wiki/Radial_shaft_seal
Exactly
You should always do a pressure test by filling your pressure vessel with an incompressible liquid (water) so that there isn't so much stored energy if it ruptures.
I didn’t know earmuffs were called ear defenders over there. Neat!
I’m pretty sure that’s a brand name, I’ve heard that in shooting ranges all over the US though too. “defender” sounds a lot more manly than “muff” I guess. In Brit slang muff means pussy so that might have something to do with it. 😂
@@scumbaggo Does it? I thought muff was a term for the bush
No muff is def pussy in Britland
An ear-muff keeps your ear warm, an ear defender protects against noises. That's the difference in Britain
@@anomalyp8584 in Ireland there’s an official government funded muff diving club
Why use a physical propeller? You want to convert a high velocity, low mass, low thrust airflow into a lower velocity, high mass, high thrust airflow. A propeller will do that, but so will air entrapment/ Coanda effect. Air blown from a nozzle into a larger convergent/divergent nozzle will suck in and accelerate a larger volume of air generating higher thrust, this could be cascaded. Think Dyson fan. This could also be done over the top of the wing through blown slats, to give lift and thrust.
Donald Sayers The momentum stays the same. If you have just a nozzle, you have little high speed air, if you use the Venturi effect, you have more, but lower speed air. Its the momentum of the air that moves the thing and that stays constant. And as he said in the video, since the air can barely even rotate the propeller, which weighs couple grams, there is no way a nozzle can push anything heavier either.
Er no the momentum is not constant. If you push a large amount of air slowly you will get more thrust than pushing a small amount of air fast, with the same energy, why else is he trying to turn a propeller instead on just pointing the jets backwards like a rocket?. That is why helicopters use big diameter blades as their vertical speed is slow, whereas fast plans use smaller props. Air blown through a wide bell mouthed venturi will generate added lift over the surface of the inlet.
- conservation of momentum
- he is spinning the prop for no reason whatsoever. he would probably get more thrust if he'd just point the tubes backward as he eliminates the friction of the gears.
- a smaller prop can spin it much faster, the criterium is speed of the tip of the prop. If i spin a small and large one equally fast, a large blade has a higher speed at the tip. And there is a stability limit to this speed.
also larger props are more efficient, but a small plane can not really use a big prop as it would touch the ground :P
I agree with this, Donald. It's very similar to what I was saying, with a different application.
Fill the bottle with somthing flammable, turn your brass rods into mini rocket motors - what could go wrong!?
I’m glad someone is covering this, I’ve been interested in pneumatic motors forever and there’s nothing out there
Awesome failure! Best way to learn. :) And please! Regular updates on long term projects are fun. We need more of your videos! :) Anyhow, best wishes!
Michael Teeuw thanks for the spoiler :/
you shouldnt read the commentary before seeing the video ;)
Yes frequent updates
Re: tolerances. Did you try printing them oversized and then turning them to fit?
Maybe ASA or ABS prints with 100% infill. Tried that once with a 3d printed PLA part and it shattered instantly. Simple rotational parts would be better turned from the start in aluminium or something like POM.
Sandpaper?
@@doel89 it would be hard to keep things true and square or achieve high tolerances with a hand sanding.
@@allansutton557 how about hand cranked lathe? it shattered because of high rpm. non powered lathe only use a spindle rope and feet to make them spin. like one of the pen making videos
For most of these parts, if they're going to be turned on a lathe anyway they might as well start as just solid stock of a more suitable (stiffer) material, instead of extruding them in soft thermoplastic in a 3D printer.
A dental turbine uses air power too but since they are tiny Pelton turbines you'll need some gearing and the power/weight ratio might not be the best for its air consumption rate.... But there's the idea!
And besides, answering your last question, In my opinion, I prefer always quality over quantity. In episodes or in a long video... As fits better to you. If you want to become a YT partner you know the rules...
Dental turbines don't have (to produce) a lot of torque and they do need a relatively large air supply like you said. They do the job by the staggering number of rpm's. The size of the turbine compared to the effective cutting axle size doesn't look too promising...but then again, I'm not Tom and maybe it ís an idea
Albert Siemers yes I think the same but maybe with the proper gear ratio he gets some fine torque. It looks to me like an electric motor from a small quadcopter. The most significant problem to me is air consumption
Split into parts! Love watching the process, Failure and success. I find the journey to these final ideas fascinating
I'd prefer a video every x weeks, but TH-cam would prefer more regular content. So whatever will help you best is what I want.
I’m not an engineer, and I have no real experience doing anything mechanical, so please take this with a grain of salt. How likely is it that you could put a gear or two on the air release so you could get 3:1 or more out of the propeller? The 1:1 release obviously isn’t the way to go … I don’t see it as a failure, just a huge loss of potential power.
yeah, having long term projects split up is better in my opinion :D
i aggree, better to see how the project evolve weekly
Yes
1:47 It went alright but the front fell off ;P
splitting up the projects into parts is a great idea!
its awesome you're even trying this. The average mind wouldn't conceive to attempt to engineer something of this nature. Most people if you can't click it and have it delivered to your door wouldn't succeed. The world needs more of you. Regardless of wether or not you succeed.
You should check out some water rocket builds, I think that will help you with building huge capacity bottles, and also it could make for some good content. I prefer 1 video every few weeks rather than parts. Does my head in knowing that you are watching a video and you know you still need to wait the same amount of weeks for the result regardless.
Excellent idea, I'd be willing to be that with an intermediate water tank between the air and the nozzle the results would be much better. Probably not the best idea during winter in the UK though...
7:54 it sounded like it leaked right there
Put it underwater to check if it leaks!
As you said the problem lies in the mass of the turning unit. What if you also increase the mass of the energy holding substance. I'm talking of a design similar to the water-air-rocket.
Me and a friend of mine build an ebike similar to your first version, but with stronger motor mount and diy li-ion battery... it's great thank you.
By the way I enjoy weekly updates. Some kind of vlog including all current projects would be nice.
water is not compressible, so you can't store it in the bottle
You don't fill it completely with water, just mostly. You then pump compressed air in. The air pushes the water out which gives a stronger reaction.
ultimatejosh yes but water is also 1000 times heavier than air, and this is supposed to be able to fly...
Corey Phelps Exactly that what's water rockets are all about.
Yes! id love to see updates every 2nd week or so. Always a pleasure seeing your notification pop up
Love the stuff falling apart and hitting the floor. You have to laugh sometimes when things don’t go as planned. Love your work. I think you are doing an amazing job.
Just happened to see this and I liked it. I had a electronics teacher that used to say " one day someone questioned Edison on his invention the light bulb and all of his failure's lead up to it and he said I have no failure's, only a thousand ways it can't be done". Keep trying eventually you will find that one way it can be done.
Hammering in bearings, this is top notch stuff right here.
Failure is best teacher. We watch for the process, the design challenge, the problem solving, etc. Success would be a bonus, but nobody has 100% success every idea. Keep it up
Here are my suggestions:1: Ive noticed that the exhaust tubes are made in such a way that they lose efficiency, make them longer as it would increase the moment arm length thus making it spin faster2:The perpendicular exhausts are pointed in such a way that they push a little forwards alongside of pushing sideways to make the propeller spin...make sure that they are perfectly centred in such a way that you do not lose any energy to the exhaust tubes pushing forwards as it causes friction and introduces a pointless vector (just dont give ''pitch'' to the exhaust tubes)
Amir A yes! Also I think he is getting huge friction losses by abruptly changing the direction of air
Longer tubes add inertia and friction and does not add power. The tubes are pointed backwards to align with the incident wind, as the whole bottleplane is supposed to move forwards. If the tubes were aligned on the plane of rotation, when the bottle is moving, you are pushing the wrong way, opposing airflow and slowing down. Having them not point backwards would decrease efficiency.
My machine design teacher in 1967 high school mentioned that type of reaction turbine was the worst for efficiency. The good ones take advantage of as much of the expansion as possible. ( your air engines do a good job of that ) Whatever works for your uploads is fine by me. I love your projects. The failures are great too, your persistence is to be admired!
3D print with extra material then plop it into an electric drill and chop of the exces bits (like a makeshift lathe)
lennart rolland needs to get it centered then, instead of chopping, sandpaper
Almost all of the air escapes in the first second or two, you could do with a pressure regulator. I think thats the main reason you did so much better with the piston engine.
I think the piston-engine with a little 12g CO2 capsel would be an cool combination !
Floh Or, just put a piece of dry ice in there
You can buy co2 powered motors for free flight models. People have also built multi cylinder co2 motos. I flew them back in the 1980s. Sometimes the co2 tank would ice up..
[this is a bit off topic] With a regulator you can adjust pressure up and down fractionally rather than just operating on/off. That way you can use less air pressure. This method can be used efficiently so that when you pump an air pressure tank up to full pressure manually, then when you release pressure intermittently on a bicycle for example, simultaneously you are pumping up the air pressure in the plenum; then on the way down a hill you can close the regulator valve and possibly continue pumping by pedal power to compress air into the plenum, and/or you can use extra downhill energy to assist pumping air into the plenum.
Enjoyed this one regardless of the outcome. I wouldn't mind if the projects were released in multiple videos :)
Checking for Leaks Method - Water Bubbles using soap and water are a good way to check for leaks as bubbles form where the leak occurs. Your videos are excellent, keep up the good work!
maybe you can print it bigger and then turn the plastic down to your required round shape?
MrHuggaga Well in that case he also has a wrongly shaped Turbine i think...
Albert Zne still, it would improve on that thing
I would think turning it on a small Lathe should help with the clearance problem...
PS: Did you ever hear of "KISS" (Keep It Simple Stupid)?
MrHuggaga I had the same thought. Depends whether Tom has access to a lathe.
Showing "failure" is impressive, shows integrity, and is helpful for experimenters. It's how projects are made, with trial, failure, and improvements. I can't overstate how impressed I am.
As for splitting videos, its up to you. I enjoy complete projects instead of "to be continued" videos, but whatever you do is cool with me. More videos = more $ from views, and you may get valuable input from comments along the way.
I'd say Quality over Quantity Tom!👍Loving the videos!
Your learning the best way possible... by getting your hands dirty. I make lots of stuff that works in my head. But once I make it, I get a little smarter when I learn how stuff reacts in the real world. I would like to see you complete a turbine model. Great video.
That propeller is very german
Why what makes it german?
@@thetrainloverdkThe shape looks like something from World War II
@@MichaelSitzmann nazi germany?
Tom, I sure do appreciate you sharing this content with us, it is very interesting to see these sorts of projects. One thing that would make it a little easier to watch is if you would wear some heavy gloves to complement your safety glasses when handling a 100 psi pressure vessel. That thing could probably give you one heck of a nasty cut if it were to give with that kind of pressure on it.
So it doesn't have enough thrust for a plane, but would it have enough thrust to push a lightweight little car?
SUV RVing He talks about it at the end. Theres not enough thrust to even spin the propeller, which weighs almost nothing, so pushing a car forwards would also not work.
Would work with a much larger single nozzle, but all or most of the air would be released at once, and that's all.
A well designed one nozzle could give you the best results. Your nozzles do no look efficient. Most of the energy seems to be converted into heat. Just take a look at the nozzles of the jet engines.
MK there is a video of a AirPowered car
If I may...
The ballon gizmo incorporated the tubes into the leading edge of the blades, giving them both structural integrity and maximum torque by way of extending the moment out as far as possible.
If you intend to recreate the vertical function of the ballon gizmo, keep the blades as light as possible and make sure the centre of gravity is well below the bottom half of the bottle. You can substitute weight with surface area, like the ballon. Maybe fit three bottles together converging at the nozzles? You could fit a restrictor once you ascertain the most efficient pressure to RPM ratio.
Convert as much of the air pressure into blade momentum as you can. Any air coming out of the tubes is effectively wasted energy. (Jet turbine sections are increasing in size because technological advances are allowing us to extract more and more energy from the combustion process)
Using thrust bearings would reduce the internal friction considerably.
Keep up the great work mate - you're clearly causing a whole bunch of us to debate and discuss!
“Negative results are just what I want. They’re just as valuable to me as positive results. I can never find the thing that does the job best until I find the ones that don’t.”
― Thomas A. Edison
"I can never find the thing that does the job best until Tesla find the ones that do.”*
46k .... now watching it in 2020 and. 386k , have really enjoyed watching all of these videos on your channel Tom , keep them going
I would like to see more of the design part of your projects. Maybe a little of your CAD work and thought process as you are designing parts. Some quick time-laps of the 3D printing. Stuff such as that. The videos do not need to be 15 minutes long. 5 minutes is plenty of time to relay what you are working on and how it is going. :-) keep up the fun projects.
Bro's secretly spreading the Mein Khampf💀
can you compare pointing the bottle backwards to your compressed air engine
Dude, you rock. Definitely going to support you on Patreon because these projects (together with the failures) are awesome! Keep em coming!
Could you do what they used to do with steam engines. They would have a small high pressure cylinder then a second maybe third cylinder which are larger to take the exhaust of the first cylinder and use any remaining pressure. Might not be as useful with this low pressure but perhaps.
A compound steam engine seems to be what I mean.
Ben Carter maybe for a car
Reminds me of the Dutch NHI H-3 Kolibrie helicopter. My father actually saw those fly as cropdusters over Flevoland in his youth. It's a small twin-blade helicopter with ramjets on the tips of the main rotor.
Put some water in it. It should work better, because reaction forces of the water will be bigger than air. Or it will blow up so.. win win
Tom, FAIL only means First Attempt In Learning! Awesome job...
Clicked on this so hard my mouse broke.
Just finished watching. I'm sorry for your loss.
lol XD
Rip little mouse, we will all remember its loyalty and sadly hard abuse of its owner..
Couple ideas.... A regulator for more constant pressure. Another idea, make the nozzles smaller, with Venturi ports to pull more air volume. Have you considered a chemical reaction in the bottle, like hydrogen peroxide and aluminum? Obviously, you wouldn't fill the bottle. I've watched some of your videos and admire your motivation
Ryan Shuey, and then use the exhausting gases from the chemicals as fuel and oxidizer. Ignite the propellant with a remote controlled spark plug ,in a from one side closed pipe. Now you've got an improvised model afterburner or at least you'll get some visual effects from it. 😉💭 👉 🛫🚀🎆🎇 🤣🤣🤣
⚠️ Disclaimer: Dear reader, I do not take any responsibility for your experiments. And everytime keep in mind😳💭, chemicals or some elements can be dangerous. ☣️/☢️ 💨/🎇 >> 🤪😵🤢🤮 🔥 💥😱😭🤕 💀⚠️
Building the pipes into the fan blades made sense because the motion of the pipes through the air is also creating thrust *and it reduced weight*. I understand if it still only lasts for a few seconds it might not be worth it, but if you did try another version maybe try building a custom propeller and putting nozzles on the pipes?
Better for you to make short updates weekly, and for us too :-)
Just a little question about your E-bike : How did u manage to fix the pulley on the shaft of the motor ? Is it just pushed in with force ?
Thanks !
TrolololGames whatever keeps his videos in my feed.
Tom, the thing you forgot when using the 2 mm spouts was air viscosity, that is why you have such a negligible thrust. I think you find that increasing the "spouts" diameter by a single millimetre will give you a marked improvement. You are expecting air to come through a 90 degree bend with some force while allowing it only a 2 mm aperture to get through. While the pressure in the tubes will be high their narrow diameter will simply not allow the air to reach sufficient flow for a decent thrust. By having such narrow tubes you are succeeding very efficiently to convert the potential energy of the compressed air in the bottle into the heat by viscous friction in the tubes. Very little portion of that energy gets converted into the mechanical one unfortunately.
watching this, I really know how you feel. partial success almost every time. This is pretty cool, with an isolated workshop in the woods.
the pauses when something falls apart are so consistent
sure, split them up its cool :)
Sentry going up!
I am happy to wait for a couple of weeks for each video. I enjoy watching 1 video that covers the entire project, i find it more comfortable. And btw, I'm super impressed by the efficiency of your products (appart from that particular project ;D ).
Keep being resourceful and keep the engineering up ^_^
Efficiency on this thing will be just awful. Air is not very good rocket fuel
Ted Archer Jet engine
Albert Zne yeah, but jet engines do not work on air. Almost all of pressure energy is waisted that way
what makes you think this is rocket fuel then?
Demy de waard because it powers a rocket engine
do rocket engines power propellers?
its just an air powered turbine connected to a propeller
the fact that speedy gasses come out of holes doesnt make it a rocket
a jet engine has speedy gasses coming out of a hole, a piston powered engine has speedy gasses coming out of a hole
Split into parts...and failures are good, they move you forward..awesome video
*THE SWASTIKOPTER*
Hi Tom, loving the project. I have also 3d printed a compressed air engine, however with my design, I use a low pressure chamber to regulate the air flow into the manifold. This allows a constant rate of pressure in the expansion chamber of the engine, and also the ability to ramp the pressure in the storage tank to a much higher PSI than the engine is rated to, thus giving more run time. My engine runs on 32PSI, and the 20oz storage tank holds air at 250PSI.
This method i took from Paintball Markers design.
Try this one with cola+mentos reaction!
It's me who's featherbrained btw! as you can tell. No, it's instructive to see failed attempts as well. I don't see why a controlled direct jet would be less efficient but it wouldn't be as much fun as seeing wheels etc turning!
Hi Tom! Whenever you upload is good with me. Always interesting to look at. If there are a timeframe it will kill the joy doing and sharing things. More like a "must" deliver and slowly kills the enthusiasm.
Some project are fast. Some are short. Some better be divided in parts. It all depends.
Keep up the good work sharing ideas.
Best Regards.
X
Don't quite give up on the design, it's very simple but it could function a bit better. I would suggest squeezing the end on the tubes to create more pressure as the air is released and the bit that screws on the bottle I think should be a bit more elongated and tapered towards the bottle so it creates a tunnel that the air travels through which gradually lowers in diameter. I think this would be more efficient with higher bottle pressure. Alternatively you could try the same design concept but instead of little vanes sticking out, you could have miniature turbine propellers inside the contraption. Pretty much how a turbo's turbine works, but instead of having a compressor on the other end, you'd have a propeller. :)
Some thoughts of if you want to pursue this project...
-Could you possibly make the holes on the end of the exhausts smaller maybe making it last longer?
-Put a heavier or lighter gas inside of the chamber??
-Also, would you be able to make this into a rocket type engine instead?
Love the videos!!
Regular project updates would be awesome! It already feels like a number of days are passing between cut scenes. People could also pitch in ideas along the way
The ball valve IS an accomplishment, especially the use of an O ring on both sides of it. Nice.
As long as the videos are quality, I don’t mind what you do, whatever is easiest, but I really like what you’re doing
I subscribed because of your failure...it's great seeing someone try something that doesn't pan out! Keep it up with these unique tinkering projects!
I wonder if it would work better with different nozzles? 2mm seems pretty wide, a narrower nozzle would restrict the airflow, which would both reduce air consumption and increase efficiency (by increasing the velocity of the air exiting the nozzle).
I also think there's quite a lot of air leaking from the gap between the valve housing and the prop hub. You can actually see it in the video when you open the valve, theres a thin burst of white gas from the gap. Finding a way to stop that would probably help a lot. I wouldn't be surprised if there's more air leaking from that gap than coming out of the nozzles.
A final suggestion: remove two of the nozzles, but make the other two much longer. That way you get the same torque with half the air used.
Tom, I’m happy to watch these in parts, or full length builds less frequently. Whatever suits you. The content is fascinating either way.
As for your trial, I was surprised to see you hammer in that delicate ceramic bearing. Could you have damaged it? It did seem rather wobbly after, and I can’t see any reason why you’d need to spin up the hub before opening the valve unless to allow inertia to carry it over rough spots in the bearing caused by damage. Could you try pressing in a replacement, with a drill press or even a vice? And when inserting the shaft, you need to brace the inner race, so the bearing itself isn’t taking the installation end load.
The other thing about run time, is that your piston engine is a fixed displacement device; if it runs slower it uses the air supply less quickly. But this reaction engine is not; the jet torque needs to be carefully matched to the prop torque. If the prop takes more torque, it will just run slow but that doesn’t reduce the rate at which the air is used up. The prop size needs to be balanced against the orifice size in your ball valve.
Please don’t abandon this project until you have exhausted its potential.
For future reference... for safety, test pressure vessels with a relatively incompressible liquid (such as water in this case), rather than a gas, to minimize the stored energy which is released in the case of sudden failure.
And a pressure gauge to monitor loss of pressure is a more practical leak detection method than putting your ear near a pressure vessel under test.
This is a great idea and you have given us an idea for our Cub Scouts to try! Thank you for all your hard work.
Understanding that failures are a part of experimentation, I was still a little sad to stuff falling apart before my eyes! Great stuff as always.
You should pinch the brass tubes and let them widen at the end to make a converging-diverging nozzle for the air.
Nice. I once knew a guy that created a helicopter that used a jet turbine engine and routed the exhaust out of holes in the rotory wing to spin it. It reportedly worked very well. He used graphite bearings to handle the pressure and heat.
Hammering on ceramic components generally isn't a very good idea... That being said, this is a super cool project! Love it!
*_miniature helicopter of tolerance and mutual respect_*
I'm no physics major, but as far as I can tell, thrusting the air out of the rear is far less efficient than converting the energy stored as pressure into rotational energy.
Thrusting it out the rear only propels the system forward as much as the mass of the air being ejected. Since air surprisingly enough doesn't weight very much, you only get as much thrust as the amount of air you can put inside of a bottle. This is the reason why bottle rockets don't just have air as the working fluid, they also push water out. Since the water has a high mass, newton's third law applies and the bottle is pushed up with a force equivalent to that required to push out the water.
Pressure is powerful, but it isn't very powerful if it only has to escape into the atmosphere by simply leaving a valve.
Since the water in a bottle rocket is beneath the pressurized air, the only escape for the air is through the water, meaning that the potential energy of the pressure in the bottle is spent pushing that water out of the way, resulting in a stronger force than just pushing itself out of the bottle.
Although, that's really more of an educated guess. Don't take my word for it.
Have you considered spinning the whole thing, bottle included, and getting rid of the bearing? That would let you avoid the leaks and friction in the bearing, at the cost of more viscous air drag (on the side surface of the bottle) and a more complex launch/testing setup.
I love your content and your supreme quality. What ever takes less time, helps you, and funds your projects the best.
When pressure testing 1. Use luke warm water make sure as much air is out of the system not air for safety. 2. Test pressure should be double the working pressure. 3.. Just watch the pressure gauge to find leaks, do not stand near it. 4 Wear a faceshield even gauges will explode shooting glass in your face. There is a lot more but thats some of the more important stuff.
You can put the bottle into water to test it, if there are leaks you can see them, and if it explodes it's not dangerous. Even better is to put water in the bottle, so that adding very few air is enough to pressurise. and again, if it breaks it doesn't explode everywhere.
Great video! So glad I found your channel a few months ago. Would love to see weekly or biweekly content if you’re capable. Even the smaller things and failures are worth watching since I feel I can learn from all of it.
Top work - Keep it up. As for less regular but full project videos verse more regular part project videos - all I can say is - if you go down the more regular but part project route then I suggest you discuss your thoughts and potential options for each stage so we can come back with other options and ideas that may help. Your analytical approach where you describe the physics behind your ideas is what makes your videos so good. I also suggest you give a shout out to your parents for being wealthy enough to provide you with out buildings and support to make all this possible. I would kill to have the resources you have.
To prevent an explosion you can put some clear tape around the bottle, that would increase the amount of stress the bottle could handle.
Greetings from Mexico!
Boy! I loved your face when things were falling apart in the first three minutes!😂😂😂
Thanks so much for this instructive video!
"Please leave a thumbs-up even if this was a failure"
I left a thumbs-up _because_ it technically failed to function as desired, but you shared the educational experience with us anyway. 👍🙂
The old co2 engines worked at 800+psi and were not much use below 300. That gives way more energy to play with than you are using. Ideally you need a bigger bore lighter piston engine so the losses are reduced as a percentage and you get more torque from your lower pressure.
So this design could be reworked.
1, there is no seal for the air entering the spinner.
2, there is no nozzle on the end and a restriction before the no nozzle.
Try a pipe which is also the bearing. A plane bearing with a rear shoulder accurately machined, can use the air pressure like oil pressure to make it run smoothly. Wil require a thrust bearing on the inside to allow the easy rotation with pressure pushing on the bearing. This minimises leakage from the rotary joint while allowing that leakage to help make the bearing run with less friction.
Now you can either have a printed prop that also carries out the gas to the nozzles. Or a separate prop and driving exhaust.
Either way their should be a large volume able to travel to the nozzles with no restrictions.
Printed prop with a ring on the outside with nozzles printed in would be my chosen design. Channeled would run down the blades to carry the air.
Or even a design where the air exits over the prop blade. Like a Dyson fan.
The energy of the expanding gas would more efficiently be converted into rotational momentum if you flipped your little tubes around, so that the short ends of the Ls were seated into into the propeller assembly. As you have it now it looks like you were going for a certain amount of leverage to assist in rotation, but by the time the expanding gas reaches the corner of the tube it has already expended a good portion of it's energy and there isn't much length of tube after that to translate that energy in a counter momentum.
KEEP EM COMING WHETHER THEY WORK OR NOT THATS WHERE WE LEARN