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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...
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.
Supersonic Nerf Cannon ─ TheBackyardScientist
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