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Very high velocity pneumatic parts.

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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Very high velocity pneumatic parts.

Unread postAuthor: kiwi of nitro » Sat Sep 20, 2008 1:13 am

I've been building combustion cannons and want to try something new.

I'm looking to launch AAA, AA C or D size batteries, out of a pneumatic at the highest velocity possible using a valve setup, no pistons,or diaphragms. I want to fire larger projectiles, I was considering a 1" barrel since that's optimal with a sprinkler valve right? Plus, will 1" fit D batteries?

Any help is greatly appreciated, my cumbustion cannon would fire Ds with tape around them and they would flatten into a pancake on impact with a boulder. It was like steel, acid filled paintballs... :shock:

I'd like to see even more power and be able to totally obliterate batteries on boulders. :)
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Unread postAuthor: ALIHISGREAT » Sat Sep 20, 2008 1:30 am

maybe a valvless design or burst disk?

http://www.spudfiles.com/forums/valveless-pellet-rifle-t15495.html check out this topic on 'valveless' pellet guns and click the link to the google patent to show a design for one.
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Unread postAuthor: Davidvaini » Sat Sep 20, 2008 1:32 am

I would suggest a burst disk.
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Unread postAuthor: starman » Sat Sep 20, 2008 3:19 am

Also, go with the longest barrel that's still practical.
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Unread postAuthor: Sticky_Tape » Sat Sep 20, 2008 9:01 am

Inline is what I suggest
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: sniper hero » Sat Sep 20, 2008 9:49 am

QEV I would say
better then a sprinkler
no problems making a piston
no modding needed

I don't know about the measurements from all those batteries
find the batteries and try it out in the shop :P
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Unread postAuthor: mark.f » Sat Sep 20, 2008 10:37 am

BTW, C batteries fit in 1", not D batteries.
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Unread postAuthor: Sticky_Tape » Sat Sep 20, 2008 11:15 am

My first ball valve pneumatic used d batteries it had a 1.25'' abs barrel
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: skyjive » Sat Sep 20, 2008 11:38 am

C batteries fit 1" SCH40, AA fit 1/2" with a little tape
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Unread postAuthor: DYI » Sat Sep 20, 2008 3:56 pm

QEV I would say
better then a sprinkler
no problems making a piston
no modding needed


As the title said, he wants high velocity. That isn't going to be possible with a regular QEV, as they can't take very much pressure.

If you want the simplest build possible and the most power possible at the same time, burst disks are the way to go. The only problem is if you want to have fun shooting it. In that case, a good piston valve is your best bet.
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Unread postAuthor: Hotwired » Sat Sep 20, 2008 5:18 pm

Well 900psi isn't exactly small beer.

The "highest velocity" (speed) possible is a bit of a huge open ended thing to say you want. An aim of being able to "totally obliterate batteries on boulders" is perfectly possible with any valve down to a ball valve.

Also, I suspect someone has no real idea of what the main valve in a pneumatic is if they want a "valve setup" not "diaphragms and pistons".

I think Kiwi needs to do some research on pneumatic cannons and come back with some kind of solid aim plus what he's up for making.
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Unread postAuthor: kiwi of nitro » Sat Sep 20, 2008 5:49 pm

Hey, I was thinking of using a modded sprinkler or quarter turn ball valve to release the pressure into the barrel.

Hotwired, I know exactly how a piston or diaphragm works inside a cannon, and I just don't feel like making a piston or dealing with a diaphragm in one of those cannons.

I have established that I'm going to use a 1" diameter barrel and I plan on putting the air chamber below the barrel, and I still haven't decided on whether I'm going to use a modded sprinkler valve or quarter turn ball valve.
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Unread postAuthor: Hotwired » Sat Sep 20, 2008 6:11 pm

A sprinkler is a diaphragm valve :)

For a first pneumatic a modded sprinkler should be good, ball valves have an awkward twisting action which can fiddle with aim a bit.

Sorry for being especially spiky in the last post, just fishing to see if it was a spoon feeding request :wink:
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Unread postAuthor: D_Hall » Sat Sep 20, 2008 6:30 pm

Kiwi,

Pay attention to the words of hotwired. He's right. You either (a) are not communicating well or (b) don't have a clue. I don't know which is the case (only you could know that at the moment). So....

If a) Do a bit of reading around here to figure out the difference in vocabulary between this forum and your own source of knowledge.

If b) Do a bit of reading around here to get the proverbial clue because your statements are contradictory. You want a sprinkler valve but you don't want to deal with diaphrams? That's like saying you want to drink a fifth of vodka but don't want to get drunk. Which is it, 'cause you can't have both!
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Unread postAuthor: kiwi of nitro » Sat Sep 20, 2008 7:53 pm

This is a diaphragm setup.

Image

I understand a sprinkler valve uses a diaphragm, but it's a contained piece that's easy to mod and install.

The picture I posted shows a cannon that uses a diaphragm to seal the barrel.

If you haven't seen this before, the clean out plug holds the diaphragm in place and some copper air pipe is screwed into the back of the clean out plug. It leads to a ball valve that releases the pressure in the pilot chamber.
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