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Shooting Appliances

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: c19o » Mon Feb 18, 2008 9:58 am

I have a 2" X 78" air chamber and an 86" X 1.5" Golfball barrel, 1.5" porting piston valve, the angle iron estimated at around 1.5kg.

So in GGDT I put in 2" piston diameter and 1.5" sealing face and 1.68" for the barrel. I think its overestimating it though, do I actually measure the pipe or put in what the pipe says it is?
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Unread postAuthor: DYI » Mon Feb 18, 2008 10:07 am

You put in what the pipe actually is. GGDT doesn't have anything built in to automatically convert to the real pipe measurements.

I guess I was right about the massively oversized chamber though.
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Unread postAuthor: c19o » Mon Feb 18, 2008 10:13 am

Ok I measured a piston that was on my desk, got 1.59 sealing face and 1.75 piston diameter. That gave it 1149 ft-lbs with a 1.5kg projectile.

DYI wrote:I guess I was right about the massively oversized chamber though.

And I even though of putting a 3" chamber on it :lol:
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