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Title:What happens when a NERF dart breaks the SPEED OF SOUND?
Duration:11:26
Viewed:13,961,439
Published:28-04-2018
Source:Youtube

The first 1,000 people to click will get 2 months of Skillshare Premium free: http://skl.sh/backyardscientist Keep Reading below! Backyard Scientist merch!! https://thebackyardscient.ist/shop/ Thanks iX Cameras http://www.ix-cameras.com/ and Matt Rece https://www.youtube.com/user/mattrece... for helping with the high speed shots! Giaco Whatever video: https://www.youtube.com/watch?v=BrtBc... 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- https://www.youtube.com/watch?v=5xuwu... 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 https://www.gatewaytoairguns.org/GTA/.... Some guy got one going like 2100 ft/s which I thought was impossible. https://www.youtube.com/watch?v=qUq4O... 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 - https://www.researchgate.net/publicat... Probably the most concise and easily understood! Numerical Evaluation of a Light-Gas Gun Facility for Impact Test https://www.researchgate.net/publicat... Shows different muzzle velocities for different barrel lengths THE THEORY OF HIGH SPEED GUNS http://www.dtic.mil/dtic/tr/fulltext/... 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, https://www.youtube.com/watch?v=2_t5L... Fortnite clip from https://www.reddit.com/r/FortNiteBR/c...

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