Shooting Appliances

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
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c19o
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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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DYI
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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.
Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
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c19o
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Joined: Thu Dec 14, 2006 11:59 pm
Location: Fairfield Bay, Arkanasas

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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