What happens when a NERF dart breaks the SPEED OF SOUND?
15,439,971
Published 2018-04-28
Keep Reading below!
Backyard Scientist merch!! thebackyardscient.ist/shop/
Thanks iX Cameras www.ix-cameras.com/ and Matt Rece youtube.com/user/mattrece/videos for helping with the high speed shots!
Giaco Whatever video: • NERF Dart Breaks the Sound Barrier, y...
A few more thoughts on the Nerf Cannon.
Yes, I know if I used a longer barrel I could get higher speeds, but I did not want to deal with a 20ft long gun. I think a 6ft barrel was enough to show what a supersonic nerf dart can do.
Davekni got a pingpong ball going 2000mph which is 2930 ft/s!! (mach 2.5). His barrel was 20ft long. It can shoot through 3/4in plywood! You can see that video here- • Supersonic Ping Pong Ball vs. 3/4 inc...
I always thought the speed of sound was the limiting factor, because the flow 'chokes' at mach 1. Its a big controversy among air-gunners, and theres like a 900 post topic on it here www.gatewaytoairguns.org/GTA/index.php?topic=10260…. Some guy got one going like 2100 ft/s which I thought was impossible. • 2035 fps PCP Airgun Lab with extensi... So it prompted me to do some research.
It turns out flow does choke at mach 1, but its only the mass flow that chokes. The gas can still expand supersonically.
Also a big thanks to Dr. Carl Knowlen from University of Washington, and u/Overunderrated, u/TheQueq, and u/InductorMan from reddit.
Here are the papers I referenced:
A COMPARISON OF DISTRIBUTED INJECTION
HYPERVELOCITY ACCELERATORS - www.researchgate.net/publication/268456817_A_compa…
Probably the most concise and easily understood!
Numerical Evaluation of a Light-Gas Gun Facility for Impact Test
www.researchgate.net/publication/270629342_Numeric…
Shows different muzzle velocities for different barrel lengths
THE THEORY OF HIGH SPEED GUNS
www.dtic.mil/dtic/tr/fulltext/u2/475660.pdf
Probably the most extensive on the subject "The reader Is assumed to be an advanced student in engineering." I hope you payed better attention in physics that I did.
Outro music by MDK, • ♪ MDK - Dream Eater (Neowing Remix) [...
Fortnite clip from www.reddit.com/r/FortNiteBR/comments/8e7vq6/the_fo…
All Comments (21)
-
This is my favorite video of yours yet!! Awesome design considerations and nice job on the construction. Plus the Schlieren imaging was super cool to see. I would have never expected nerf darts to survive being shot at supersonic speeds!
-
Nice. Now make it break the speed of light.
-
Breaking news: Florida man robs bank with nerf gun
-
Ah yes, breaking the sound barrier with a child’s foam bullet. This is what I subscribed for.
-
“Is that a gun in your pocket?” “No sir. shows Nerf gun My friends and I are having a Nerf war in the park.” “Oh. Carry on.” *cut to a man getting murdered by a Nerf bullet
-
Imagine hiding behind half an inch of pinewood in a nerf fight, thinking you're safe, then this dude straight up murders you 😂
-
Me at 3am: aight, imma go to bed Youtube recommendations: nerf bullet breaking the speed barrier Me: i need answers
-
I just love how Matt looks so done with everything.
-
Hahahahaha. Your outro was way better than usual in this episode. Not sure what it was, but I loved it!
-
Imagine getting wallbanged by a nerf dart
-
"And of course we had to try a giant capacitor blowing up a banana" Uh, yes, sure!
-
Lol that was a beautifully done and very appropriate demolitionranch outtro! XD
-
Nerf: Our darts are made to not hurt! Backyard scientist: A R E Y O U S U R E A B O U T T H A T
-
No one: Backyardscientist:I can bench 800 PSI
-
This video gives me serious Mythbusters vibes! Love it
-
half inch pine was the military standard for a lethal wound for years...scary
-
When you said you put an ear plug in the back to keep the nerf dart from exploding kit reminded me of cave Johnson in portal saying he figured out how to have turrets fire the whole bullet
-
Friend: wanna have a nerf war? Me: ok Friend: pulls out jolt Me:
-
“It wasn’t loud enough to see on the camera.” -TheBackyardScientist
-
8:17 wow supersonic!!!
