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Pneumatic launcher

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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Unread postAuthor: pricetag » Sat Apr 19, 2008 4:56 pm

I basically want to make a rocket, which one should i make?
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Unread postAuthor: clide » Sat Apr 19, 2008 10:11 pm

bigbob12345 wrote:Please explain this [wiseass physics knowledge] because I dont see how it could possibley make it explode :? Water is heavy if you use enough but wouldnt shooting heavy things be the same.
And Ive done it dozens of times, with no explosion what so ever.

It won't make it explode directly (unless you've used crappy material for the barrel). But if your gun isn't built to handle the recoil or if you aren't prepared for it then it is very easy to snap fittings and/or hurt whoever is firing.
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Unread postAuthor: DYI » Sun Apr 20, 2008 9:10 am

A properly built gun won't explode even if you fill the barrel with lead and fire. On the other hand, if your gun was made of PVC, excessive recoil could damage the fittings, but any heavy projectiles will do that.

I had a similar problem with my SCTBDC that involved the DWV ABS reducers on the barrel cracking open when I shot 10 pound darts at 400 psi. Wrapping it in a large amount of fiberglass seemed to solve the problem.
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Unread postAuthor: bigbob12345 » Sun Apr 20, 2008 9:13 am

TurboSuper wrote:Did you fill the whole barrel?
What was the cannon made out of?

Barrel filled all the way
It was made out of sch40 pvc
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Unread postAuthor: Brian the brain » Sun Apr 20, 2008 9:24 am

Get malleable iron fittings and ballvalve and try again.
The water puts too much stress on PVC.
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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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