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3 shots shotgun design

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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3 shots shotgun design

Unread postAuthor: Demon » Mon Nov 17, 2008 6:40 pm

I just learned then my friend was playing real airsoft with his friends...

Now i wanna play and i thought for about one day and got this final design:

Each chamber is 1 inch long and 1 inch pipe and the barrel is 2 inch long.

When you pump the gun, you open all the valves exept the one on the barrel, after that you close them all. To shoot you open one of the chamber valve and fire. to shoot again, close the chamber valve and open a new one.


Ps: i dont use a sprinkler valve because it makes way to much sound...
This gun is based on shoot and run.(shoot and disapear without letting the "enemy" know where you are.


Edit by MrC for content and grammar
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Last edited by Demon on Wed Nov 19, 2008 7:27 am, edited 7 times in total.
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Unread postAuthor: jonnyboy » Mon Nov 17, 2008 8:07 pm

Try paper cups for the shells.
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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
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Unread postAuthor: Demon » Tue Nov 18, 2008 7:04 am

Try paper cups for the shells.


Do you mean make cup with paper or using a cup made out of paper?

The two are not an option because the strange flow of the ball valve rip appart paper wadding... and the paper cup is too big to enter in a 1 inch pvc tube.
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Unread postAuthor: Rokmonkey » Tue Nov 18, 2008 7:14 am

You'll have a possibility of 4 shots because of the dead space in the center between all the alves. Or if you stick to three, the first shot will have much more air behind it than the first, the second and third chambers will be emptied into a lower pressure chamber on firing. Just something to note.
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Unread postAuthor: Demon » Tue Nov 18, 2008 7:25 am

You'll have a possibility of 4 shots because of the dead space in the center between all the alves.


I was actually thinking to that... and the dead space looks big as the chambers....
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Unread postAuthor: psycix » Tue Nov 18, 2008 4:10 pm

Having your gun able to fire multiple shots is only really usable when you can also load ammo in the same rate.

You could also make exchangeable chambers.
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Unread postAuthor: Demon » Tue Nov 18, 2008 4:52 pm

Having your gun able to fire multiple shots is only really usable when you can also load ammo in the same rate.


To reload i will just disconnect the barrel from the adapter...
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Last edited by Demon on Tue Nov 18, 2008 5:45 pm, edited 1 time in total.
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Unread postAuthor: pocket » Tue Nov 18, 2008 4:53 pm

here she is kinda self explanitory all though they take patients to make them the dimensions depend on the barrel diameter but the length is 2 3/4
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Unread postAuthor: Demon » Tue Nov 18, 2008 5:50 pm

I finaly got the perfect design to make the shell:

I just put paper around bbs with wadding at each end, it makes ,this way, reload in less then 5 seconds.

Now wish me good luck, i am going to start construction very soon.
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Unread postAuthor: pocket » Tue Nov 18, 2008 5:53 pm

lol your welcome?... good luck though i spent days perfecting it now im not supposed to say this on this forum but i was able to take d*w* a b*r* at 10 yards with this design and i believe it was the shell
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Unread postAuthor: iknowmy3tables » Tue Nov 18, 2008 5:57 pm

you got some seriously small dimensions, each additional filling chammer has got to have more volume than the dead space between all those valves, using 1" fittings you will get a volume approximately equal to 12inches of 1"pipe in there, I would recommend reducing the barrel size to 3/4" pip, that way you can use real shotgun shells as shells
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Unread postAuthor: Demon » Wed Nov 19, 2008 7:26 am

you got some seriously small dimensions, each additional filling chammer has got to have more volume than the dead space between all those valves


Well... for some reasons i cannot discuss here because this airsoft shotgun is not "legal" , i dont need it to be very powerful.
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Unread postAuthor: starman » Wed Nov 19, 2008 8:36 am

If you go with it as a 4 shooter, the first shot (from the center section only) will be a different shot than the other 3. They will include the center section and the chamber being fired. For this reason, I think I would tend to minimize the size of the center section relative to the chambers and just make it a 3 shot, releasing any pressure that was in the center via the barrel before loading the first shot.

Nice little idea. You would want to close off used chambers after they are fired....remembering which ones you've fired may get a little tricky... :wink: For safety reasons, a gauge on each chamber would be a must.
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Unread postAuthor: Demon » Wed Nov 19, 2008 2:38 pm

for safety reasons, a gauge on each chamber would be a must.


Not really because it will add a lot of leaks, considearing the when it is glued, there is no leaks...

And why add a gauge on each chamber for safety's reasons?
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Unread postAuthor: MrCrowley » Wed Nov 19, 2008 3:22 pm

Demon wrote:
for safety reasons, a gauge on each chamber would be a must.


Not really because it will add a lot of leaks, considearing the when it is glued, there is no leaks...

And why add a gauge on each chamber for safety's reasons?

If you install a gauge correctly there shouldn't be any leaks. I'm not sure what you mean.

I don't think a gauge on each chamber is a must, be a single gauge would be. So you know how much pressure you're putting into the whole cannon, when you close off the other sections, the pressure shouldn't be any different.
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