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Questions about a small pump-up gun

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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Questions about a small pump-up gun

Unread postAuthor: Gusher » Sat Dec 15, 2007 3:04 pm

Please go easy on me here. I have made a couple of air cannons in the past and used them at several indoor football games shooting tee shirts. The guns I have made are big and I use a SCBA (like SCUBA) tank as my air supply. My question is how should I go about building a smaller one that I can still shoot shirts with a 3" barrel that I pump-up?
What is the best hand pumps you have used?
Should there be a check valve between the pump and the chamber?
I have never made a mod. valve would that help with this smaller run to achieve better results?
Thank you in advance for the help.
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Unread postAuthor: Novacastrian » Sat Dec 15, 2007 3:14 pm

A modded valve will help performance however to make a cannon that shoots t-shirts any kind of distance and is pumped up by hand is kind of crazy i think. Your arms will fall off after about 2 launches i think.
You could use a stirrup pump or a MTB pump, but i recommend sticking with the SCBA tank, or get yourself a "pony" bottle used for diving.

Edit: Welcome to Spudfiles "Gusher" :lol: What a funny name, you don't want to hear that word on the operating table, "Nurse, we have a Gusher!"
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Unread postAuthor: Hubb » Sat Dec 15, 2007 3:17 pm

Have you considered using 12g CO2? It will be fairly easy to incorporate into a T-shirt launcher.

Going smaller with the size means the pressure has to be increased to get any type of performance and a 12g will allow for that, although you may not be able to use a sprinkler valve.

If you insist on a hand pump, I would suggest a shock pump...to keep your arm from falling off after the second or third shot.
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Unread postAuthor: Novacastrian » Sat Dec 15, 2007 3:21 pm

Mr hubb, a shock pump only displaces a very small amount, how will that save his arms? Good idea with the Co2 though :)
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Unread postAuthor: BigJon » Sat Dec 15, 2007 3:40 pm

Yeah if you tried to use a shock pump, you wouldn't get very many shots off as it is very tiring. Try to look for a bicycle pump or something similar that puts out large volumes of air.
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Unread postAuthor: Hubb » Sat Dec 15, 2007 4:05 pm

I apologize for not being clear. I was under the impression that he waned a smaller chamber, which is why I recommended the shock pump and 12g setup.
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Unread postAuthor: Gusher » Sat Dec 15, 2007 4:09 pm

Sorry not playing dumb it comes natural what is a shock pump?
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Unread postAuthor: ShowNoMercy » Sat Dec 15, 2007 4:31 pm

A pump that is used to pump shocks.
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Unread postAuthor: Gusher » Sat Dec 15, 2007 4:34 pm

If I use a 20oz. CO2 bottle how many shots should you get?
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Unread postAuthor: JDP12 » Sat Dec 15, 2007 5:06 pm

depends on chamber volume, and what pressure you want to operate at
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Unread postAuthor: Gusher » Sat Dec 15, 2007 5:14 pm

On my other guns I used a 2 1/2 lb extinguisher as a chamber at 120psi.
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Unread postAuthor: Hubb » Sat Dec 15, 2007 5:16 pm

Gusher wrote:If I use a 20oz. CO2 bottle how many shots should you get?


Use this.
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