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New Piston Design (Around the Barrel)

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: SpudFarm » Sun May 18, 2008 12:31 pm

ohhh i misunderstood the valve. now i think i understand
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Unread postAuthor: clide » Sun May 18, 2008 3:10 pm

It will work but it won't be terribly fast and may not work well for light projectiles. Normal piston valves have a quick jump in force when the piston starts to open (check out the piston valves explained visually sticky if you want to know why). This valve wouldn't have that jump and force so it would have a strong tendency to only crack open or oscillate open and closed.

I also don't notice any benefits over a normal coaxial piston. It will require more seals, be much more difficult to construct, and I don't see any simple way to make the piston serviceable.

It's great that your thinking of things on your own and I encourage you to continue doing so, but I wouldn't suggest building such a valve.

Welcome to the forums.

Oh, and Velocity you might want to check the radii you used in your calculation.
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Unread postAuthor: daxspudder » Sun May 18, 2008 3:31 pm

I think this is a great idea, but as it has been said before there are a lot of seals requires, but depending on what you make the piston out of it could work very well. my new input is that your diagram shows multiple spring valves, while it would work its just more parts that can fail, and you can get just as good of a fill from a single valve. also a lot of people keep mentioning your "large" pilot volume, im assuming that you will actually make it much smaller, and that the picture was just the easiest way of showing it using ms paint. also you should place your ammo feed system in front of the piston... otherwise your just gonna shoot air...
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