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idea for 3/4" QEv Sawed-off

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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idea for 3/4" QEv Sawed-off

Unread postAuthor: Brian the brain » Sun Mar 15, 2009 3:23 pm

That would be Sawed-off Mark III for me, or the Ultimate Sawed-off perhaps..

A quick sketch up
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: JDP12 » Sun Mar 15, 2009 3:44 pm

I like it quick quetion however- how do you plan on reloading the mag?

I presume a threaded cap on the end or something similar.

Also how were you planning to seal it?

Looks good, good luck
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Unread postAuthor: Brian the brain » Sun Mar 15, 2009 3:57 pm

I can reload it by breaking open the barrel completely.

Simple huh?

I plan to seal it by sliding a pipe over the barrel and the qev port.
Wich I need to lathe down to fit the sliding pipe.

I plan to either fill the reservoir with a fridge pump to whatever pressure I can get, or replace the entire reservoir by a CO2 bottle and " reg" it with the internal pop-off safety valve.This should give me a lower working pressure.
Just low enough so the hammer valve doesn't lock up.
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: JDP12 » Sun Mar 15, 2009 4:19 pm

Yes i Like it alot..

How big of a spring do you think you'll need to cock that hammer and have it successfully fire?
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Unread postAuthor: Brian the brain » Sun Mar 15, 2009 4:23 pm

The same one I used on B2TB..It's about 1/2" diameter and 2" long.

The hammer doesn't need much force, just mass and speed.
The moment the hammer hits the valve, the spring is no longer pushing.

If it were, the valve would not close back up.
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: JDP12 » Sun Mar 15, 2009 4:24 pm

oh true. I see now how mass would matter more than speed,

Best of luck building this gun!!! I can't wait to see the results
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Unread postAuthor: Brian the brain » Sun Mar 15, 2009 4:31 pm

Gotta get the money first...so it will be a wait.
Got some more brainstorming to do about a hammervalve and piston roled into one in the mean time.

\with the valve piloting on the barrel side, through the piston..

It will take a lathe, 3 O-rings and it will start a new wave on SF if I get it right...
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Unread postAuthor: JDP12 » Sun Mar 15, 2009 6:35 pm

interesting... good luck
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Unread postAuthor: inonickname » Sun Mar 15, 2009 7:48 pm

Brilliant! I'm unsure about that magazine, but if you have a lathe to do the sliding collar on it will be fine. Good idea on the inbuilt "reg", it should work great.

Lets see it happen (soon enough hopefully)
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Unread postAuthor: psycix » Mon Mar 16, 2009 2:07 pm

It will take a lathe

I'd be happy to machine something for you. But you probably already knew that.

The magazine idea is really good! It reminds me on your "falling block" design, but now with a better possibility to seal.
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Unread postAuthor: Lentamentalisk » Mon Mar 16, 2009 7:07 pm

Ok, there is obviously something I am not getting about the whole reloading mech. Could you explain it to me please?
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Unread postAuthor: starman » Mon Mar 16, 2009 7:41 pm

Lentamentalisk wrote:Ok, there is obviously something I am not getting about the whole reloading mech. Could you explain it to me please?


I have to agree. The barrel is going to have to solidly reconnect to the breach for each shot. How is this better than a more standard magazine/bolt type loader?
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