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Compact Pistol

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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Compact Pistol

Unread postAuthor: maverik94 » Sat Dec 19, 2009 6:12 pm

Over Christmas break, I plan on starting a new project, so here it is. I want to build a compact, full metal handgun. Specs are:
4.5mm (.177 cal.)x4-5" barrel
1/4 or 3/8" chamber(not sure of length)
Anyway, I want the gun to be no longer than 7" long. The gun will be a single shot gun. I am not sure what kind of valve I am going to use. Makbe a piston valve, but I am kind-of thinking of a hammer/pushbutton valve. Anyway, I hope this will be a fun little project. What I want from you is some input. What kind of vlave do you think I should use? I'd prefer not to go with a coaxial piston valve, but I can if I need to. Also, do y'all have any other suggestions for this gun? By the way, I am thinking of a breakbarrel breechloading design, so any ideas or alternatives on that? Thanks! And I will report on any progress here.
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Unread postAuthor: bradisfun » Sat Dec 19, 2009 6:49 pm

sound like a good project i will be following this 1.
i think mebey a push buton valve?
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Unread postAuthor: c11man » Sat Dec 19, 2009 7:16 pm

sonds good, i say piston valve with pushbutton pilot.

im going to do a winter project and its the one in my sig
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Unread postAuthor: maverik94 » Sat Dec 19, 2009 8:16 pm

sonds good, i say piston valve with pushbutton pilot.
The only problem with that is that having a pushbutton valve and a piston valve would take up a lot of space. I am kindof leaning toward a hammer or pushbutton valve to tell the truth.
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Unread postAuthor: c11man » Sat Dec 19, 2009 8:56 pm

a piston valve and push button doesnt have to take up much space at all, my old brass coax was a good example
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Unread postAuthor: maverik94 » Sat Dec 19, 2009 11:09 pm

well, not much space in a rifle, but in a small handgun you need to conserva as much space as possible, so I think I'll go with a pushbutton/hammer valve.
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Unread postAuthor: jackssmirkingrevenge » Sat Dec 19, 2009 11:48 pm

If you want compactness and power for single shots I think a coaxial is your best bet, why not combine something like this with your hammer system?
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Unread postAuthor: POLAND_SPUD » Sat Dec 19, 2009 11:54 pm

you could buy a manually actuated 3 way spool or poppet valve... probably even 1/8" valves may offer good flow for 4.5mm cal

but in order to get good opening time you would need to get either:
a piloted valve (so one which has an inbuilt miniature valve which 'pilots' the spool)

or

a poppet valve (I don't know if this is true of all of them... but the two poppet valves that I bought switch instantly - probably because they are not balanced and once they open air pressure helps them to open even faster)

the whole gun would consist of the 3 way valve itself (which would act as the main valve) a short length of pipe to act as the chamber and the barrel

you could even put a small air cylinder and use the same loading mech as I used on my semi
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Unread postAuthor: psycix » Mon Dec 21, 2009 8:59 am

I suggest coaxial QDV. It will give you the best performance in the most compact package.
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Unread postAuthor: jhalek90 » Mon Dec 21, 2009 7:04 pm

I am working on a piston valve, piloted by a blow gun.... the gun is just under a 18 in but it has a 12 in barrel... the total length minus the barrel is that of a 1/4'' T and a 1/4" elbow with a 1/4'' close nipple in between.

Just took it upto 250psi. louder than your mother after the dog pees on the floor.
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Unread postAuthor: qwerty » Tue Dec 22, 2009 4:29 am

Like mine? i just used 15mm copper coaxail and i get very nice results with an O-ringed piston at 200psi i get 500fps +. But this is very old(3 months) and i didn't bother posting it. Overall it's very fun, loud! and easy to service. ( i can hand open and close everything because i just use o rings.)
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Unread postAuthor: chinnerz » Tue Dec 29, 2009 7:49 pm

looking at your avatar, why not try and base it off a flint-lock pistol. Nothen sexier than a flint-lock blunderbuss... coincidentally there is also nothing as “badass” as one :P
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Unread postAuthor: Brian the brain » Wed Dec 30, 2009 6:15 pm

A sawed-off double barrel is slightly more badass..

why hasn't anybody made a double barrel coax yet....????
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Unread postAuthor: thedeathofall » Wed Dec 30, 2009 7:02 pm

why hasn't anybody made a double barrel coax yet....????


we are waiting for you to set the bar... you seem pretty good at the handheld shotgun thing. :wink:

I'll say the oring idea is pretty good. I'll have to try it out some day, but the idea of a flintlock pistol is awsome as well. It would be a pain in the butt to make though.
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Unread postAuthor: jackssmirkingrevenge » Wed Dec 30, 2009 9:56 pm

Brian the brain wrote:why hasn't anybody made a double barrel coax yet....????


Not a coax but surely 9 barrels is enough ;)
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