The series of shockwaves from this explosion in a tunnel
ฝัง
- เผยแพร่เมื่อ 12 ก.พ. 2020
- the Tunnel Shockwave, series of exposions in a tunnel
tunnel being blown up causing a shock wave
A série de ondas de choque dessa explosão em um túnel
tunel sendo explodido causando uma onda de choque
Can anyone explain why this occurred?
comment bellow
tunel sendo explodido causando uma onda de choque
This is the coolest thing I’ll forget about immediately
Lol
Amazing isn’t it we find it cool but immediately forget
Edit: Wow this blew up
relatable
BWHAHAH
Right?!
That initial cloud coming towards you at that speed is terrifying!
I was inside a tunnel during a blast
Yeahyeah johnny, we all remember our first beer too.
@@gavinvalentino6002 I think they put something in your beer, not that it's bad or something
@@UCgx7OseCrundqkE8oEVeobg ok redditor
A really good visualization of the exact speed of sound
"your hearing loss is not work related"
The speed of that fuse is just amazing. The first second you can see the line streaking to the end of the tunnel almost immediately.
The tunnel is approximately 286-300m long which makes the cord detonating at approximately 2000-2145m/s. There is very few frames to count but it's almost certainly not PETN detonating cord and more likely to be a shock tube detonator.
Recommend using ,< and .> buttons on the keyboard to count the frames, some are ambiguous so it is tricky to decide how long the cord takes to get there and the shockwave to come back.
I counted about 4 frames for the cord which is about 25 for the shockwave to come back. The video is 30frame/second.
@@Lazermaster3720Expert's word
@@Lazermaster3720 🤓🤓🤓
What the flash might look like to us irl
They call it shock tube.. it's a hollow plastic tube with an explosive compound coating the inside surface. The burn rate is in thousands of feet per second.
My brother in law "found" several boxes of this at a construction site and was using it as weedwacker string because he didn't know what it was. I saw the box and also thought "shock tube" was some kind of super-effective trimmer line, but then I saw the HAZMAT symbols and told him he'd picked probably the worst possible thing one could ever put in a weedwacker.
Not sure somebody answered that yet but ... the waves bounce back and forth because the waves cannot spread but instead get reflected at each end. Outside, sound or shock waves from blasts would spread in all directions and become weaker, but here the tunnel shape keeps things focused. This is actually what happens inside flutes, organ pipes or any other tubular instruments (the bouncing - not the explosions) and exhaust pipes - the sound gets trapped and the pitch generated depends on the length of the tube, which determines the travel time of a reflection before it turns back.
The fluffiness (i.e. that you can see the waves) is due to the fact that the explosion is a sudden and high pressure event - a shock wave. It has a leading high pressure front, followed by an almost equally strong drop in pressure. This rapid pressure drop is what causes condensation. Air at a given temperature and pressure can hold a certain amount of humidity in gaseous form. If the air's pressure suddenly drops its temperature will too, and can no longer hold the same amount of humidity. All excess humidity turns into small liquid droplets. In shock waves, this only happens close to the wave front so the air gets cloudy where the wave is and returns to normal once it passed.
Edit: initially, this was really meant as a simple explanation for the curious ones. I am overwhelmed by the number of reactions and questions. I have slightly modified the original comment to work in some clarifications. But since people liked the "shortness" I will leave it at that. There are however, more detailed discussions in the thread below.
But overall I am happy for the sincere interest and thanks - both for the thumbs up and questions / discussions and the stuff I learned from this thread.
Thank you for the explanation.
It is a common misperception that shock waves and audio waves are identical phenomenon, but they are distinctly different.
I feels edjucated, thank you, great explanation.
🧐🤔😑...yes, I gave you a thumbs up 👍😜
This is same process that causes the condensation rings aka the Wilson cloud, to form whenever there is a very large explosion, like from a nuke
My lower intestine after Taco Bell.
**reverb fart**
Dude LMAO
lolll niiice
That sounds painful
Blahahahaha
Judging by the number of frames between the explosion and the shockwave coming back, we can estimate that the tunnel infront of the camera is about 183.5 Meters long. Edit: for those of you asking, I calculated it by counting how many frames it took for the Shockwave to bounce back (as I mentioned earlier) then, I took the average speed of sound, and divided it into the number of frames (considering that the video is at 60 fps), giving me the answer.
Who tf are you? Pythagoras?
@@NotMe-ej9yz bro can’t tell physics from trigonometry 💀
Few millimeters longer, actually.
@@Sun_Seeker i mean its quite understandable because the physics im doing requires me to do mental gymnastics with geometry to find components of a force etc
What is the temperature of the tunnel? And how much time it takes for the sound to reach the observer?
This is why you never run into a tunnel to avoid an explosion. If the pressure wave wasn't strong to kill you outside it might be strong enough INSIDE.
This is why bunkers in tunnels have shock stoppers to stop this very thing otherwise yep you’d be just as dead as outside. 😮
im amazed people are in there at all during work like this
thanks for the advice...
Nope, this happens as explosion is inside the tunnel. There would be pretty much zero affect from an outside explosion..
I too love spreading misinformation on the internet
The fact that you can see the wave bounce back and forth a few times is epic
legendary moment
It was just guile. From street fighter. Sonic booming
O lol it used that pfp for so long good taste
The fact that u have this many likes in a short amount of time is just epic
@COMRADE nice try
I’ve felt shockwaves from being in the military around explosions. It’s not like high speed wind, its a completely different experience. It’s like all of the atoms in your body are shifting over a bit and coming back to their original place. Like the wave passes through you instead of just a force pushing around you.
I was in an earthquake once, the initial rumblings got me to my front door just in time to see the whole world move about 4cm to the left and back again (very quickly) now that is what I expect when I am told about shockwaves !
It is like getting hit by a brick wall depending upon the size.
I'm an electrician and have experienced an arc flash while standing far from it. This feels about right. It feels kind of like sound through the body, but a lot less 'soft'
Yup being next to a M1A1 tank shooting into a second floor house a almost point blank in my time in the earth shakes and lifts the very dirt from under you you just feel it in your chest and neck
Is it like when you put a speaker up against your body and you feel vibrations, but on a larger scale?
My father works in the mining sector as a maintenance manager, and this type of blasting happens very frequently. The base camp is about 1.5-2 km away from the mining site and I could hear loud explosions from that far.
My dad was a mining engineer forever in PA back in the day, and my Grandfather was the VP in charge of safety for the same mining company. They had to get Oxygen into the mine for the miners to breathe, but also evacuate all of the Methane gas out of the mine so it wouldn’t explode when encountering sparks from the mining apparatus.
One day a mine DID explode. It happened during “miners vacation “ which was a one week period when all of the mines would shut down at the same time, and everyone went on vacation. There was only one person present in the mine when it happened whom was a supervisor and stayed behind that week to monitor the mine.
I remember we at the beach in Ocean City, MD when it happened, and we had to leave as soon as it happened so they could begin rescue operations.
My dad said when they found this unfortunate souls body, it was as thin as a sheet of paper because the pressure of the blast basically crushed his body against the shaft of the mine. That’s how powerful mine explosions are.
That’s like being inside a gun barrel without the projectile being flown at you
perfect analogy
If that's the case, is anything being thrown at me? Like how can there be a shockwave without an explosion of some sorts, or in this case, being inside a gun barrel without feeling the bullet come at me?
No, if you were small enough to fit in a gun barrel, you would be obliterated by the force of air coming out. Blanks have killed people just by the force of air when placed close enough to vial organs.
In Soviet Russia you are the projectile
@@s-w Alec Baldwin liked this comment.
not many people have experienced a shockwave before. A shockwave is like an uneasy feeling of energy going through your body. Your inner organs can actually feel the vibration, making the feeling for first time super weird
Many millions of people experienced a shockwave as it is always a thing when any jet is breaking the speed of sound barrier...
@@Bialy_1 a jet and an explosion are not the same. I'd much rather a jet fly over my head than be in this tunnel.
Jets aren’t typically allowed to break the sound barrier over civilian airspace.
Closest I came to this was when they were facing a quarry. They drill several holes down into the upper part of the side face, fill them with charges, and detonate them, thereby separating a two to three story tall section off into the pit to be excavated out later. Those charges are several feet down inside of solid bedrock, yet when those charges went off (all detonated at the same time), I could feel that "whump" in the cab of my truck parked outside the quarry, with the windows rolled up and the A/C on. Pretty impressive.
Bro this happened to me at a crazy death metal concert. It felt like all my organs were shaking and pounding from the crazy loud sounds that I was right next to.
Claustrophobic people when a big cloud wall comes in front of them in a quite small tunnel:
I love how at the frame the guy hits the detonator the camera's shutter speed cannot keep up and you can see the line between the lit up parts of the detonation line and the unlit ones that were taken a fraction of a second sooner.
It’s always interesting seeing how, in the grand scheme of things, sound is actually pretty slow.
My god, how did a whole war break out in the replies?
same with light
So is ur mum's weight
@@BobuxGuy that's good
No. It's around 600 mph, depending. This wave is slow. It has nothing to do with the speed of sound.
@@hot-gochu No. In no possible way. Completely wrong. You cannot be wronger.
Watching the sound wave barrel toward you must be one of the most intimidating things to witness.
@COMRADE LOL. That just made my WTF playlist.
@COMRADE Cant believe that really happened. 😎
Well, normally you aren't afraid of that for very long. Or anything else ever again.
th-cam.com/video/x8ex6ofm4UY/w-d-xo.html
Really cool to watch the beginning at .5 speed
It must have been terrifying experiencing the first shockwave storming towards you and it get's you within 1 second after the charger. The second and third were just cool.
“Okay bro I need to fart just.. give me a sec”
(Cough Cough)
0:01
Pretty impressive how this person kept the camera steady, especially when you compare it to his friend to the left. I feel like something that loud and intense is hard not to flinch from, he must have alot of experience.
I want to take a stab and say the guy recording this video was wearing ear defenders whereas the guy to the left was not. I mean the guy setting off the charge wasn't even wearing any which is ridiculous but I won't go ranting down that rabbit hole.
Further evidence to back my theory is the guy filming this video has done so in landscape as opposed to the guy on the left who is filming in portrait. So we can immediately assume the guy filming this video has more brain cells than the guy on the left, which would mean he could potentially be smart enough to be the only person who decided to wear ear defenders.
Obviously this is only theoretical as I stated before, but it seems plausible to me 😅
@@AldenDoble filming in landscape in this situation is actually pretty dumb it's easier to drop your phone that way ... Who has more braincells now Sherlock
@@El_Goblino_ how is it easier to drop your phone when you're holding it with two hands? 🤦🏻♂️
@@AldenDoble that dude takes landscape recording with one finger from each hand it seems
I'm happy he didn't hold his camera vertical. True sign of a pro
That was the coolest thing I've seen in while
yeah that was definitely the coolest thing i've seen in the last 12 to 24 hours
RIGHT ✅??
Yall speak for yourselves... IDK what i just saw
Agreed interesting that the spark of explosion was at the near end and you see the explosion travel away and then the back repeatedly.
I'm glad it's not my ears that was subjected to that pressure dip after pressure wave of explosion. I wonder if that burst his ear drum?
Can you imagine the amount of damage it does to your hearing even with plugs the waves have no place to go but forward and backwards so it takes longer for the sound to dissipate so your hearing is absorbing all of that energy until it stabilizes again
It actually wouldn't do any damage at all if you have decent earpro. I can explain why in more detail, but you probably don't care.
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I care. Please explain.@@bailey2517
@@bailey2517 I care what's the deal with it
@@bailey2517explain it
video uploaded 3 years ago...
from a random channel...
is less than 30 seconds long...
Truly one of the great videos in all of youtube!
That doesn't get pushed for 10 years.
There might be so many standing waves as well. But the fact that we can see shockwave compressing the air multiple times, is amazing.
please can u explain what did we see? i mean was that shockwave just bunch of.dust flying or was it a sound? sorry i was worst in physics
@@arthurfleck2464 not the biggest physics buff but I think what we’re seeing here is the shockwave (or pressure wave) from the explosion making the water vapor in the air condense, basically turning the water in the air into a cloud before the pressure returns to normal and the cloud disappears.
Then since they’re in a tunnel, it’s bouncing back and forth and doing it multiple times every time the pressure rises high enough to condense the water again.
@@arthurfleck2464 correction, I did more research. The cloud doesn’t appear where the actual shockwave (or high pressure is), but right behind a shockwave is an area of low pressure. When the air pressure drops, it loses its ability to carry as much water vapor, so the water condenses out into a visible cloud.
@@Morbuzka wow thank you man that is actually soo interesting. so i guess we learnt something new lol
Shut up.
It’s really cool having a visual reference for the speed of sound (or something close to it) with that initial shockwave! It’s fast, but honestly not as fast as I thought it’d be.
Looks like it's pretty close to the speed of sound
I agree. It's pretty cool to get to see stuff like this without actually doing it ourselves
Yeah I mean sound is a speed achievable by humans. While it's hard to do Its possible I wouldn't want to be in that tunnel without heavy sound protection tho
@@serenashinon1264 tem um avião russo que voa 3 vezes a velocidade do som
@@joffebisk1446 Sounds like it, too! :P
Me after a taco bell night:
Workers in the sewer:
Very entertaining and fun to watch. Thanks for posting this.
the fact that there is a frame where you can see the entire spark is absolutly insane
Looks so cool!!
dude yesss thank you that looks LIT
the spark takes 3 or 4 frames
@@ryanj610 your answer is what I was looking for. Thanks
That's one of the toughest thing I have done. 🥴
When I was 11 years old, my father explained to me the difference between the speed of light and the speed of sound while showing an explosion in the quarry!
Thats awesome
@@alepepperoni2563 Yes it is, he was my Hero! Thank you! 💋
@@valmiravo was?
@@ylahadid7109 He's lived long enough to become the villain.
Ok
Imagine how big of a badass you would feel like, saying “fire in the hole!” And pressing the button for that explosion
I really like seeing the condensation propagating with h the wave. One mechanism of energy loss in an acoustic wave is heat transfer from compressed (and thus warmed) to uncompressed ( and thus cooled) portions of the wave. Here, the condensation shows the cool portion of the wave.
Thanks!
If I was there, I'd be shocked. Many times over.
Like these guys were!
Shocked and waved!
111 likes
I'd be blown away!
Great place to take a date.
When younger, I worked as a Certified Underground Bituminous Coal Miner! At depths of well over a thousand feet underground, we often used explosives to remove hard rock obstacles and to remove overhead rock, to enhance or redirect airflow. Explosions in any limited space, will bounce shockwaves back & forth multiple times and as that happens, Coal Dust is kicked up and if it find an ignition source, it too becomes explosive and can kill everyone inside and blow them out the portal!
atomized coal turning into a conflagration sounds pretty terrifying.
How do you get certified? By buying life insurance?
Oh wow sounds like a great job.
@@ravensnflies8167 Want to see explosive, coal mines are safe compared to grain silos.
@@zerogrey3798 i heard so. all those micro particles with oxygen in between need is a spark. i breathe fire so i know about atomization to produce plumes. ive used cornstarch before to demonstrate the effectiveness of ignition. shits wild lol!
That’s insane, you can actually see it reverberating throughout the tunnel
Straight to the point. Good vid.
Based on time the shockwave hit them, and the fact that they were underground where the air pressure may have been even greater that it is at sea level, the end of the tunnel where the explosion detonated was almost half a kilometer away.
Probably a bit closer as there seemed to be a slight delay between the lever and the sparking of the explosion, but yeah you're probably pretty close
@@shadowflamegaming7446 I reckon about 1 to 1.5 seconds which is 330m to 500m at 15degc and 1013mb
In the artillery we used the flash bang method for determining distance of our fire missions.
Knowing the speed of sound is 333 meters per second it was easy to estimate for the crew!
Sure it is, nerd.
@@jmanynames7410 the shockwave travels faster then the speed of sound. In this situation the "flash bang" method doesn't really work.
You can actually see the spark or whatever travel all the way down if you look at the pipes right after he does it. Really cool.
yeh
The shockwave seem to come before he detonates.
The spark went down way faster than the wave came back😳
@@anderslarsen2311 look at 0.25 speed, you can see the line of orange shoot back before the wave even forms
This was the most insane part, how quickly that flash of orange light traveled to the part that exploded. It was way faster than the sound cloud thing
Me and the boys committing a lil bit of tom-foolery in the particle accelerator
Lol! At 0.25 speed you can see the Nonel cord flash down the tunnel to the charge. Really cool to see the return pressure wave so clearly. I've never seen one before, as I'm always in total blackness. Even though I'm the one that presses the button it still makes me jump every time!
Crazy how fast it is.
If you use the < and > you can go one frame at at time, looks really cool!
@@NSaw1 Never knew about this feature - thanks!
Roughly what’s the net explosive weight of this shot?
I’ve seen at normal speed.
It's amazing to actually see the trillions of particles in unison reacting, bouncing so quick from one another, rushing to get to our ears one second after the blast. INCREDIBLE!
🤓
Either that, or they froze from shock. xD
@@badasstoad9419 😁
By looking at your comment and your profile pic I can tell you at least have an IQ of 1000000000000000000000001
@@RizzLegend916 😲😁😅🙏🏻 Thats Goku status! I wish! Lmao 👍🏼🤣
Imagine doing this but in a tunnel that loops back and fourth… imagine how many shockwaves
isn’t that what’s happening?
@@mohakchugh2525 shhh it’s okay, people go mad
Good old days of TH-cam, no bogus background commentary 👍
The first shockwave is terrifying as it's coming towards you
It’s a little bit faster than in the movies
@COMRADE hm
Do you just look for a comment that has a lot of likes and copy and paste it? God Love Ya :) You kids are cute.
@COMRADE down goes the red plague
@COMRADE of course you promote your channel, fucking hell
I once walked through the abandoned Woodhead rail tunnel under the hills between Manchester and Sheffield, four miles long, dead straight and concrete lined. My footsteps crunching in the stone ballast echoed and echoed seemingly infinitely. It was a most bizarre sonic experience. Stone or brick lines tunnels dont do this.
Been there enough times!
🐕
Imagine you're 3 and a half miles in and you see a bright light behind you accompanied by the screech of steel against steel
Thru peak district? Such a nice area
@@misterzia01 go into a refuge area?
@@mariolisa2832 if there is one close enough?
This is so awesome, yet instantly forgotten, that when I went to like it... I seem to have already watched this and liked it in the past
Amazing, seeing the fuse light moving that fast back to the tunnel then the incoming wave.
As a 17 year old who has nearly been hit by a very deadly shockwave from an explosion causing my eyesight to be lost in my right eye and my color vision to be lost in my left, almost going deaf in both ears, and almost breaking my spine, I can confirm these shockwaves are not nearly as weak as they may look. Be safe from these, this was done by professionals, I would assume.
Rest
@@anonymoususer602 It was when I was 14, I have rested much since then, but did not regain vision in my right eye or color vision in my left, I still have trouble hearing, and my spine is probably in worse shape now.
@@PrismX. god bless you ❤️🙏🏻
Harsh dude, stay strong bro.
You're so strong bro. Hope you get better in the future
You can practically see all the details, from the electric pulse sent to trigger the explosions, to the shape and speed of the shock way traveling around. Simply fascinating!
That's not actually an electric pulse, it's detcord. You're watching a small explosion propagate down the cord until it hits the chunk of explosive a few hundred meters down the tunnel
it’s like a real life vine boom
The real life explosion. Sound like very loud.
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Amazing 🤩 exciting work 👏
Ive already seen this, liked it, and then forgotten about it immediately. Classic!
It's been over 40 years since I worked inside a hydroelectric tunnel. The miners had a blast and didn't tell us. All I saw was the black cloud of dust rushing up the tunnel at me! But we were two miles inside, where could we go. The miners were all laughing at us!! We were the welders. And those were the good old days
the good old days, not phones in sight, people living the moment
@@MpSniperM1911 doesn't take not living in the moment to document your experiences
Seems you didn’t have a blast...
@@MpSniperM1911 aaand you ruined this beautiful comment
@@miweneia ?
I can't imagine being a proctologist, doing this all day.
"When you're about done reading the comments, but you find just one more gem..."
Little head, big fat tush
When you fart it goes *whoosh*
"I can't imagine..."
Sees a tunnel.
"Anus!"
this is what eren felt when he got hit by a bullet in the neck
Im glad we didnt get the footage from his mate to the left who filmed vertical.
our camera man barely flinched, compared to the other guy recording. Thank you
This was well worth watching at the slowest playback speed, especially the initial shockwave.
Interesting to note, a few of the waves seemed to go backwards, and then forwards, likely due to the initial blast, and the air pressure at ground zero.
I just saw your comment of Yamaha in the in the Hello Foe! Community post lol.
@@juandavidaguilartorres3788 Nice!
@ Tomlinson: Excellent observation - the waves seemed to go backwards then forward... I don't know if the same principal is in play here but recently researching a mechanical bypass of my emotions system (off road use) and learned that w/out the resistance a small vacuum results in between each pistons combustion causing un-burned fuel to get sucked out. LOOONG END short -- I think it's a vacuum reverberating against ambient pressure and then again until normalization.
But...
how in the #@¢% did these people not sustain brain trauma!?
Actually there is an entire post a couple spots above yours that explains what you're seeing. It's shockwaves being reflected back and forth in the tunnel since they have nowhere to really dissapate rapidly.
Some of them are ... i don't know if "secondary" would be correct name. You have an expanding bubble of hot gas that instantly cools down and collapses - it becomes a bubble of lowered pressure, it physically collapses on itself and that collapse creates another explosion. Much better seen in heavier mediums where cavitation is a thing. Look up sonoluminiscence or guns shot under water in slow motion - you can see it pulse back and forth couple times.
This is basically a very expensive demonstration of the reason your water pipes make a hammering sound when you close a faucet too quickly! X3
That's 'water hammer". If you slam a fire hydrant closed, it will blow the pipes underground apart at the joints! My best descriptive of this phenomenon is to imagine a huge number of closely-packed people running full-tilt down a hallway and the lead bunch runs right into a closed door. All the weight of all the people still surging forward will crush into the blockage, (crushing the people in the forefront, I'm sure!) and quite likely burst right through the door! Water is over 8 pounds a gallon, so imagine thousands of gallons racing through a long length of large diameter pipe, and then trying to suddenly stop it all with a valve! The pressure will rise up into thousands of pounds of pressure!! No regular connection will hold that, and it might even split the pipe along the seam from when it is manufactured! And this really does happen in industry! Firemen are trained to be careful when closing off hydrants, or even the device at the ends of the fire hoses!
Words does it all the time to the shower. I tell her to stop and she says I’m crazy
@@fuzz428 sticks and stones may break bones but Words will never listen
@@busterhikney6936 hahahaha you're a legend
Such hammering sound exists when turning off a faucet? Never heard of it.
This is exactly the kind of things i would see in a movie and think it doesn't looks like that in real life.
Reality is stranger and more based than fiction.
You can tell that the tunnel is a lot longer behind the camera than it is in front, just by counting how long it takes for the first shockwave to bounce back. Amazing video!
Cool observation. :)
@@Bobrystoteles
Big brain
@@Bobrystoteles In estimates terms yes, but we can't say this is accurate since we don't know what temperature of the tunnel is
Speed of sound * time = Distance (No temp)
@@user-rw3bk6wp4m its not big brain its just a general math
🤓
Pay attention people: Now this - THIS - is how you shoot a TH-cam video: LANDSCAPE ORIENTATION, CAMERA HELD STEADY AND NOT SPASTICALY WAVING ALL AROUND. And keep in mind, this guy did it confined in a tunnel with a damn explosion going off!
after last week’s vid that near gave me nauseas and epileptic fit at same time, i would have to totally agree with your message.
And starts off right at the action
Hats off to the cameraman. And we can see the "how to NOT shoot a video" inside this video as well, on the left: a dumbass shooting vertical.
Also not shouting "world star" like a spastic😂
Well said Sir. Also didn't have those stupid words "MUST SEE" in the title.
I hope they had a pressure there to record the pressure waves. That would be interesting to see the data from.
You just survived an emission
Good job Stalker
My dad was a tunnel superintendent they did all hard rock drill and shoot mining. He always told me after setting a charge you went around two 90ﾟcorners before detonating it.
I would have....
So 2 90°, thats 180° half way turn and face The explosion! Got it! Thanks 🤗
@@Kokaiinum1 Sounds like somebody has to read instructions every time they put on a condom.
@@tartarsauce5250 no need, we know this person doesn't get laid.
This is the same effect that occurs inside engine's intake and exhaust manifolds. This is the science of tuning those items by changing length for power and torque curves.
Could you give brief overview?
@@louf7178 I'll try brief. As we can see here, those waves of pressure and sonic pulses occur within an engine's manifolds created by the inherent included mechanical process of the cylinder's pumping effects, the opening/closing valves and partly by the combustion process, create scavenging(pumping) effects within the manifolds that aid filling and emptying the cylinders which allows increases of efficiency gained by changing- tuning- the length and size of those manifolds.
Various videos on yootoob cover this with all manners of examples, dyno testing, diagrams, and more by searching variable intake manifolds and intake tuning...
@@fyrbyrd71 Thankyou. I would think there are too many deflections for effectiveness. Thx.
@@louf7178 "Never underestimate Mother Nature!!" Proven science...
I'm not sure why manufacturers don't just make the exhaust manifolds equal length. I put some on an old 4G32 engine and the difference was noticeable (may also have had to do with a 2.5 inch side exit exhaust through a high flow muffler).
Serious series, serious punch!
I was once hit with a pretty small shockwave from a gas explosion and it knocked me over, I have no idea how these guys weren't blown away
It depends on the distance. So assuming that the gas you pertained was relatively close then naturally the intensity is strong. But for these men...you cannot expect them to stand somewhere too dangerous as to blow them away. The distance traveled along with the elements inside such as water has decreased the intensity significantly.
@@phantomt717 ah I see, the explosion still looked crazy strong in the video but it makes sense
is this a fart joke
@@Jagar_Tharn *n o*
@@BoomBoomSoup He's an imperial battle mage, don't underestimate his power my friend.
00:01 what you see right before death
TFW you are enjoying a cup of coffee on your balcony in Beirut.
Amazing!
This video is freakin awesome. I love this.
Random fact: If anyone would like a rough idea of how fast the voyager 2 space probe is traveling through space, then the spark on the detonation cord at the very beginning is traveling around a third of the voyagers speed. 😊
mind boggling speeds!
And supposedly it will take 20,000 years for it to pass by alpha centauri. Space is BS vast lol
@@Gladuos1 Its truly insane 😅
@@josiahmcdunning9399 the solar probe that just entered the suns atmosphere is moving faster right?
@@grimaffiliations3671 Yeah a crazy 101 miles a second so probably 10x the speed of voyager 2
Workers: “here it comes”…
Ryu at the other end: “hadouken!!”
😂👍
Lol.. i still have that street fighter game sound effect in my memory from so many years ago
I've made a living being too close to explosions before, so my first thought about being trapped in a overpressure situation is panic. Hope they had top notch ear pro.
..Interesting how that guy gets enough time to cover both of his ears with his hands after hitting the switch....It surely gives us a sense of how lengthy the tunnel is in actuality !
Fantastic vid! Interestingly, this is exactly what happens in a train's air line for the brakes. The train can be miles long, and when you take air on the train, the air moves in waves through the "tunnel" - a pipe running the full length of the train. The air wave moves to the tail end of the train, reflects off the end and the reflected wave moves back up to the head end at the locomotives. This is why they train you when you take air on the train to wait 30 seconds for the air pressure to stabilize before you do anything else because you have these pressure waves moving back and forth a few times, changing the air pressure at the specific location in the air line at each pass of an air pressure wave, and changing the applied braking pressure at each point in the air line.
While we're on weird science facts and all that, this stuff about train brakes is all true! That was the bug-a-boo back when they were all fighting to come up with effective train brakes during the Burlington brake trials in the 1880s. It was the difficulties of getting smooth braking action out of compressed air over long distances. Westinghouse won out with his invention of the "Triple Valve" which ended out the smoothest application of all of the combatants. Nothing works better than hydraulic brakes, BUT they are nor practical for long lengths, especially with DISCONNECTIBLE and mix-and-match vehicle hookups! NOTHING reacts as fast as a liquid-based brake medium, but it has several major drawbacks!
You can see this in electrical signaling as well. If I send a signal down a transmission line without proper termination on the ends, I will get reflections off the ends of the line. It's visible on an oscilloscope.
I am curious if a pneumatic termination mechanism can be made to damp the reflections in a brake line. A similar concept is a hammer arrestor in fluid lines, though that is a different phenomenon (more to do with mass flow in an incompressible liquid).
That's because all fluids are described by the same equations, and a hydraulic system is just a fancy small tunnel :p
Stupid question - why arent the shockwaves affecting the men inside the tunnel?
Word salad.
Kudos to the guy holding the camera dead still.
i misplaced my ear protection from amazon before watching this video. now everything sounds muffled, the windows are shattered, and all the furniture in my apartment just moved an inch
My new favorite video.
I need this kind of more algorithm, not just a random meme.
Sketchy demolition man: I'm going to explode Dynamite inside a closed pipe, care to come inside with me?
Camera guy: sure!
He's in creative mode
You're the only sketchy one here. These guys are highly trained.
@@OffGridInvestor lol
@@OffGridInvestor So why he was inside this pipe?! They did not teach him during that trining that it is a very bad idea to be inside this pipe during this type of explosion?
I've watched it dozens of times. What does the guy actually do, which causes the shock waves?
-thank you for explaining!
The fart that you let loose when everyone's finally gone.
🤣🤣🤣🤣🤣 oh my god. I can't....🤣🤣🤣
😂😂😂😂🤣🤣🤣
Yes, sometimes the shock wave from that kind of release can be felt across the room. That's when you KNOW it's time to get the hell out, or you will be overcome by the toxic gas that follows.
🤥🤢🤮
😂
That's crazy that you can actually see how round and smooth that first blast is. It really shows you what sound actually looks like
It’s because the tunnel is round. Are u okay in the head
@@StinkyPataki it's common sense that sound forms to whatever area it's in. Much like a gas in a closed container. 24 people seem to think I'm okay in the head. What are you on about?
@@StinkyPataki make that 53, meanwhile you got 0
@@velboi3823 do I care? No.
@@StinkyPataki now its 82 to 4
Thought those guys were toast for a second
The first shockwave coming at you is like a real life horror game jumpscare
Played on .25 speed the wire seems to "ignite" before the sparker even hits down all the way as well as the glow of the cable is visible for all of a single frame basically. Insane
There’s a reason why it’s call “Det (detonation) cord”
@@mariolisa2832 Thats not Det Cord. Thats Nonel. The explosive propagation is contained inside of a small tube thats coated on the inside with explosive powder.
Also called shock tube
It didnt seem like it was before but its a lot cooler in 0.25
The cord glowing before the sparker hitting it was caused by how digital cameras film. It's not like film where it all gets pictured on the screen but rather pixel by pixel gets put on the frame, as you can see, it started from the bottom first, meaning we can see the spark first at the bottom. But this also means that the frame rate of the camera was slow enough to miss the frame where the sparker hit the start of thw cord
@@similar_username No you're absolutely wrong it's normal delays of hearing the sound waves (the click sound of hitting the trigger)
A big enough explosion in a tunnel like that would literally render any living thing into a big greasy spot where they once stood. The reflecting shockwaves were cool though, must have been pretty humid down there to see them so well.
When you try to fart silently.
That initial one was insane.
This looked dangerous af... with the wind moving so fast I don't get how they're not blasted away.
This is one of the coolest things I've seen in a long time..... The pressure difference was literally visible in the moisture in the air, that was amazing and I'd never get sick of seeing it everyday.
your ears would get sick of it for sure.
oh boi you'd get reeeeally sick eventually, maybe not mentally
@@kaykmartins7335 - IDK if I could get sick of it, it's like seeing something you're not supposed to see.... It's just so cool, but I bet the job sucks being cold and wet all day. 😩
and generally, that happens with most all shockwaves, especially in bigger explosions. I'm not sure of the physics behind it.
I like how the demoman actually made an effort to cover his ears.
He knows.
sound waves can move blocks of granite high into the air also quartzite and limestone can be moulded with different vibrations
Thank god we got landscape video
It looks like this would be a blast to experience
I see what u did there 🤣
and a blast from the past
Does it blast your ears?
BA DUMM TZ!
Dad jokes
Best video. No long boring intro, straight to the content, no cringy thumbnail, and not a clickbait.
That's a great video right there!
This comment though is pure click bate, 👌 how do I know that cause the smooth great taste of corona is one that's hard to beat when blowing up stuff under ground.. corona a thirst deserved
@@chocosmith2243 ... you okay, bud?
“you better have shockwaves to finish the job, if he had shockwaves after he-“ moments before disaster
I love the pressure wave just going back an forth
In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the medium. Like an ordinary wave, a shock wave carries energy and can propagate through a medium but is characterized by an abrupt, nearly discontinuous, change in pressure, temperature, and density of the medium.
The shockwave causes the air pressure to increase which then causes the very humid air of the tunnel to condense into a cloud. Once the high pressure wave passes, the air pressure returns to normal, the water vapor quickly evaporates back into the air, the cloud disapears.
So what you are seeing is the high pressure shockwave reflecting back and forth down the tunnel. The tunnel is also going to scatter and reverberate (and absorb) the shockwave a bit causing it to disspate over time. These reverberation effects will cause a dissonant incoherent set of soundwaves. But, you can see a point where the reflecting shockwave gets stronger suddenly right at the point where they are filming. I think this is a point where the primary shockwave and the reverberations overlap coherently and reinforce each other to create a stronger than normal point (node) in the dying echo. That's why there is suddenly that stronger cloud at around 14 seconds in the clip.
Thank you
Yes
Thanks for explanation
Thanks for the physics tutorial
Bill Nye The Science Guy!
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Lol Thanks, I enjoyed the info.
I cannot tell you how much I love clips like this. To see that initial pressure wave coming is mesmerising!
Yup. These random videos which we have never seen and are totally amazed by them.
You just did tell everyone.
Cool job