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piston surface area?

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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piston surface area?

Unread postAuthor: mopherman » Thu Nov 29, 2007 10:42 pm

I know i probably should know this, but does anybody know how much available surface area a piston has to have for it to actuate? I only have 1/8 of an inch of extra space in a launcher I'm planning and that worries me :?
thanks
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Unread postAuthor: jackssmirkingrevenge » Thu Nov 29, 2007 11:14 pm

The bigger the available area (total piston area - barrel inner diameter) the better, however if your piston is a tight fit, you keep your pilot volume to a minimum and use a good pilot valve, there's no reason why it shouldn't work.
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Unread postAuthor: rna_duelers » Thu Nov 29, 2007 11:49 pm

should work fine,alot of BTB cannons use a piston that has nearly no surface area left over and boogieman made one that worked and it had no surface area that was extra,until the piston met its end.

Mr Wilson my GB cannon only has maybe 4mm either side if the piston and it works great.Nothing to worry about.
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Unread postAuthor: RDX, » Fri Nov 30, 2007 7:57 am

its only a good thing if there is not much surface area :D ,my new GB cannon has piston that is 55mm diameter and my seat is 52mm and works great :wink:
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Unread postAuthor: Biopyro » Fri Nov 30, 2007 1:54 pm

I have a problematic (unfired) piston valve which has very little surface area. I haven't yet worked out if the problems are due to the polymorph piston IU am using, or the extremely low surface area. Has anyone else used polymorph for a piston?
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