So..."what gave you the idea of making this?
"Simple my good man !! I wanted a powerfull, steel, burst disc cannon, without having the crap of not exactly knowing when it would fire...so, i thought i could add a ball valve behind the union where stis the burst disc!
Results?
Amazing! the burst discs i use can hold up to 15 bars, so...plenty of air!! I filmed my self shooting in slow motion (600 fps) to see when the air comes out. Well, burst discs explode when i have opened the ball valve at its 3/4 th.
Power is here, no need to search for really more, almost 900 fps (slow motion helps for estimations) with a 4 gram (60 grains) marble, 600 fps with a 10 gram lead sinker, 400 with a 15 grams sinker. (big 7/16" lead balls) that is with a burst disc. When i get tired of changing the disc i simply use extreme tight fit projectile (usually need to push them with a hammer) so that gives me quite the time to open the valve.
Stiil, efficiency is way better with a burst disc. (8 layers of alluminium foil)
The chamber is 1" wide, 1' long. barrel, 1/2" wide, 3,2 ' long.
All materials with nominal pressure of 25 bars. (± 400 psi) i am below the nominal working pressure of the components.
Here is a video i made, be sure there will be more. (i have bought glow sticks, and i'm gonna shoot them against targets in 300 fps slow motion)
[youtube][/youtube]
