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Multi-shot designs?

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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Multi-shot designs?

Unread postAuthor: hunternet93 » Wed Apr 28, 2010 2:46 pm

I'm planning an airsoft "spread launcher", and want a good multi-shot design. It needs to be pretty cheap, simple to build, and portable. My first cannon has to be pumped for every shot which really smells when the enemy is only 20 feet away and your sidearm is out of ammo... :shock:
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Re: Multi-shot designs?

Unread postAuthor: jackssmirkingrevenge » Wed Apr 28, 2010 2:57 pm

hunternet93 wrote:a good multi-shot design. It needs to be pretty cheap, simple to build, and portable.


Something like this? ;)
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Unread postAuthor: JDP12 » Wed Apr 28, 2010 2:58 pm

lol ghetto indeed!!
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Unread postAuthor: kydavies » Wed Apr 28, 2010 3:06 pm

you need a large airtank in combination with blowgun valve and a clip/bolt action or muzzel load
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Unread postAuthor: hunternet93 » Wed Apr 28, 2010 3:10 pm

Wow. How does it work? (I have no BBMG knowlage sorry) This would be great at airsoft games! Does the coke bottle hold the compressed air?
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 28, 2010 3:19 pm

hunternet93 wrote:(I have no BBMG knowledge sorry)


Get some!


[youtube]http://youtube.com/watch?v=_GMMbyJbUQM[/youtube]

can someone link jor2daje's excellent high speed BBMG footage in the wiki?

Does the coke bottle hold the compressed air?


Pretty much, usually around 90 psi - but with a dedicated air tank you can go higher and it will last longer.

lol ghetto indeed!!


I didn't have access to my workshop at the time, what was a spudder to do? :D
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Unread postAuthor: hunternet93 » Wed Apr 28, 2010 3:24 pm

I get how it works now. Does the bottle really supply that much air? Or are you using a compressor?

EDIT: I didn't see your new post before I posted this. Thanks for the info!

Another edit: How long would a 2 in by 3 ft chamber at 80 PSI power a small airsoft BBMG? I'd rather not carry around a compressor in the field. :lol:
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Unread postAuthor: clemsonguy1125 » Wed Apr 28, 2010 4:03 pm

Maybe 5 seconds, you could even do something as simple as 2 ball valves 3 inches apart with that air tank you mentioned and breech load paper shells full or bbs, for the breech just cut a rectangle in the barrel and use a pipe repair coupling, this wont be the most powerful launcher but should give you the spread you want and the multiple shots per tank you wanted. Heres plans for a two ball valve breach loaded nerf gun
http://nerfhaven.com/homemade/zero_ballvalve/
Multi shot BB gun
http://www.instructables.com/id/Gift-Ho ... Christmas/
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Unread postAuthor: hunternet93 » Wed Apr 28, 2010 4:20 pm

clemsonguy1125 wrote:Maybe 5 seconds, you could even do something as simple as 2 ball valves 3 inches apart with that air tank you mentioned and breech load paper shells full or bbs, for the breech just cut a rectangle in the barrel and use a pipe repair coupling, this wont be the most powerful launcher but should give you the spread you want and the multiple shots per tank you wanted. Heres plans for a two ball valve breach loaded nerf gun
http://nerfhaven.com/homemade/zero_ballvalve/
Multi shot BB gun
http://www.instructables.com/id/Gift-Ho ... Christmas/

You just described my first pneumatic cannon :D. It works pretty well, but I've decided to make a BBMG now after finding how simple they are. What would be the best kind of tank to use to be able to fire at least 30 seconds, while still being portable? I've seen a few portable compressors, but they'd be too expensive and noisy.
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Unread postAuthor: clemsonguy1125 » Wed Apr 28, 2010 4:28 pm

HPA, the setup will run you about 100 to 150 bucks, or co2 which will run you around 100 bucks, if you do this make sure you regulate it, right now im looking into propane but have not done testing yet, noname powered one of his bbmgs by propane and a few other have filled pneumatics with it, Ive got a topic about a bbmg rig, Ill see if I can find
BTW did you post your first gun
http://www.spudfiles.com/forums/propane ... 20242.html
Theres the link
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Unread postAuthor: hunternet93 » Wed Apr 28, 2010 4:34 pm

clemsonguy1125 wrote:HPA, the setup will run you about 100 to 150 bucks, or co2 which will run you around 100 bucks, if you do this make sure you regulate it, right now im looking into propane but have not done testing yet, noname powered one of his bbmgs by propane and a few other have filled pneumatics with it, Ive got a topic about a bbmg rig, Ill see if I can find
BTW did you post your first gun


I haven't posted it yet, I might today if I have time. I don't have the money for HPA or CO2, my budget right now is about $50. I might just make a sniper rifle, it would be more effective in many situations anyway. Could I have a larger tank connected by a ball valve to a smaller tank, and the smaller tank is connected by a blowgun valve to the barrel? I would open the ball valve, monitor the pressure using a gauge, and when it got to a certain pressure close the ball valve and fire.
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Unread postAuthor: clemsonguy1125 » Wed Apr 28, 2010 4:41 pm

For propane yes, people do it on advanced combustions all the time, it expands slow enough to monitor it but air you wont be able to, that will work ok for a sniper but the best thing to to would be to make a piston valve out of galvinised steel and mount a shock pump to it, this will give you much higher power than a pvc tank. BBMGs use such a high amount of air its hard to make them portable withour regulating HPA or CO2 Heres my attempt at a portable BBMG
http://www.spudfiles.com/forums/portabl ... 19708.html
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Unread postAuthor: jor2daje » Wed Apr 28, 2010 5:49 pm

I think something like this http://www.spudfiles.com/forums/my-plinker-t16854.html could be good, for me I got about 15 high power shots (probably more if you are airsoft safe) and it could be filled easily with a bike pump.
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Unread postAuthor: clemsonguy1125 » Wed Apr 28, 2010 7:52 pm

I made one like yours and with a 3 foot 1 1/2 inch chamber I got 30 airsoft shots at 60 psi. Only 20 were decently powerful though. Once I added a gravity fed magazine it became to weak to puncture a coke can. Make sure you spring load the magazine.
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Unread postAuthor: Gun Freak » Wed Apr 28, 2010 7:54 pm

You could make something like the XRV because it only takes like 5 seconds to reload with a good magasine setup.
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