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Multishot Air volume Query

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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Multishot Air volume Query

Unread postAuthor: carl2.0 » Mon Jul 14, 2008 2:18 pm

Hey guys Im building a new sprinkler valve pnuematic with a built in spring loaded magazine that will hold 3-5 pellets. Im now workin out calculations for the chamber, my first puematic had a volume of 178.92 cm3 and at 120 psi I only got 1 shot. What volume should the chamber be for this new pnuematic if Im lookin to get atleast 3 shots at 140-150 psi ???
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Unread postAuthor: rednecktatertosser » Mon Jul 14, 2008 2:24 pm

You arent going to get more than one effective shot out of a sprinkler valve cannon. It is impossible. the pressure discharges too quickly and holds the valve open.
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Unread postAuthor: blind909 » Mon Jul 14, 2008 3:58 pm

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Unread postAuthor: psycix » Mon Jul 14, 2008 4:49 pm

Sprinkler valves CAN empty the chamber in multiple shots, but it means a quick and short pilot is needed, maybe something like an hammer valve.
The first shot will be the most powerful and the power will drop off with each shot.
I would get the largest volume possible since its very hard to get more then 1 powerful shot out of one single air tank.
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Unread postAuthor: frankrede » Mon Jul 14, 2008 5:06 pm

It is possible using a regulator and possible some flow constrictions(think a washer glued into a male adapter fitting before the valve
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Unread postAuthor: carl2.0 » Mon Jul 14, 2008 5:11 pm

Ahh ok makes since I guess...Hmm soo what about a QEV ?? that could work as well ?
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