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Hammer trigger air usage question??

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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Hammer trigger air usage question??

Unread postAuthor: boyntonstu » Sun Jul 12, 2009 4:50 pm

From: http://www.quackenbushairguns.com/bandit_1.html

It says, "The way this gun gulps air, you'll want to use a scuba tank to refill it most of the time. I found our test Bandit used 400-500 psi of air per shot for the first two shots. I felt that four good, powerful shots were available with each 3,000 psi fill. It's possible to get more than 10 shots from a fill, but the velocity of the final one will be down in the 400s."

The gun is charged with 3,000 psi.

After the first shot it is ~2,600 psi, etc.

My question: What does "used 400-500 psi" mean in practical terms for a single shot rifle?

IOW What chamber volume would be required at 500 psi to equal a single shot of the Quackenbush?


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Unread postAuthor: inonickname » Sun Jul 12, 2009 10:58 pm

My question: What does "used 400-500 psi" mean in practical terms for a single shot rifle?


It means that the chamber pressure of 3000 psi has dropped by 400-500 psi. It will drop by higher numbers the more it is shot due to a lower volume of gas remaining in the chamber, and more gas being released to get equal energy.

You would need a much larger chamber than the volume of gas that is released in the first shot is; as the gas in the quackenbush is 3000/lb in^2.
(read the gas laws for clarification).

If you're designing a certain gun, then GGDT is the way to go.
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