Made out of a bicicle pump! The idea is to use the one way valve that every bicicle pump has on its piston, to improve the performance of the gun, instead of using loose pistons as usually. I know the difference may not be crucial but it's for the sake of well-design. The piston is too heavy but seems to prove the theory. At only 75psi it shoots a 0,2g 6mm plastic bb through a steel (yes, steel. This is Europe) coke can. Filled with water it pierces the can and leaves a mark on the other wall. Air leak detected, soon to be fixed. UPDATE 20150719 Air leak was fixed with teflon tape. Cannon was intended to be tested to 10bar / 145psi. At 8bar / 116psi the back bursted off the main body, propelling it against a wall, with the cannon hitting at a great speed. Result is a bent cannon. Speed doesn't seem to have decreased but precision has been seriously affected. Plans for now are to test the energy at 75psi (like this teaser shows), then cut the cannon to the unbent part (which is about half the lenght), glue the back permanently and test energy again at 75psi to see the relationship between cannon lenglt and muzzle energy. Afterwards, with the back end fully glued, repeat tests at 116psi / 8bar and hopefully get the same energy as full-lenght-cannon @ 75psi. If not, test pressure until total burst, or the desired energy achieved. Advise is greatly appreciated. Thanks for watching! A FewFriendsFace production Likeyright FFF2015 All likes reserved

0

0

0

247

Yet another poor quality video of the homemade pneumatic cannon made out of a cheap air pump for using the own piston as it works like a one way valve. Thus, you don't need to leave a small clearance for air to leak and load the main chamber. The piston let's the air flow into it, but on the shooting phase it blocks it. It's the same that happens when you pull the handle of the airpump (air enters the cylinder) and then you push it (air is NOT released, but compressed). The target in this video is the back plate of a pringles can. At 3,5-4 atm as seen here it pierces it. At 6 it goes through. At 7,5 the rear cap explodes XD And no... I'm not in undies. It's a swimming pant (summer in Spain!!) XD So please focus on the ballistics and keep YOUR mating rituals for your friends and beloved ones. Another funny fact. The rear cap explossion propelled the main body against a furniture and the aluminum cannon BENT. So poor accuracy now, but back before the accident it was kinda good...like let's say hit an apple at 15 meters (yeah, I know but I didn't want to put my eye or face close to the gun, so it surely would have been better. To the naked eye, the BB looked like flying pretty straight) Thks4watching All likes reserved

0

0

0

378