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Flak Gun Help

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: judgment_arms » Mon Jan 28, 2008 6:25 pm

Nobody’s placed an order yet. If you want one read my last post.
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Unread postAuthor: ShowNoMercy » Tue Jan 29, 2008 3:55 pm

I think and hope that this will be my last question, yea right, but anyway, here it goes. To attach the air ram to the barrel, how should I go about doing that? The wrench in the works is that the barrel cannot be punctured, so no bolt through it. There lays the problem of how to mount it. It must be strong enough to move a 15 foot barrel so I am perplexed, again. :roll:
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Unread postAuthor: judgment_arms » Tue Jan 29, 2008 4:16 pm

Ream out a coupler, affix a mounting point to said coupler, glue said coupler to barrel.
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Unread postAuthor: grumpy » Tue Jan 29, 2008 4:29 pm

you could do something similar to this. not sure if this has been posted here before or not.
http://www.youtube.com/watch?v=EKHYS8DnPzE
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Unread postAuthor: socoj2 » Tue Jan 29, 2008 5:07 pm

O you could look about 15 post below you...

Because the Boom boom can only shoot 1 barrel every 3 seconds...

Mine on the other hand ;)


http://www.spudfiles.com/forums/build-l ... 12314.html

Unless you have a block to distribute force you are going to have an issue with a single Rame cycling the bolt.
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Unread postAuthor: ShowNoMercy » Tue Jan 29, 2008 5:21 pm

Well I am not going for a very rapid fire rate here, I am mostly going for the appeal of a breach loaded cannon that happens to open and close the breach for you. Nothing special.

Furthermore, I am using a rather large chamber and a Supah, so my fill rate will be rather slow.
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Unread postAuthor: socoj2 » Tue Jan 29, 2008 7:27 pm

I guess it depends on what you shoot. and how much power you want.

I have 60 CUI @ 60 PSI
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Unread postAuthor: ShowNoMercy » Tue Jan 29, 2008 8:58 pm

Umm my chamber as of now and is most likely to get bigger, is like 6 feet of 4 inch PVC, whose volume I would figure out but my head hurts. And since my air compressor is a tiny waste of space, it takes like 5 minutes to fill. :cry:
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Unread postAuthor: DYI » Tue Jan 29, 2008 9:36 pm

Your chamber volume is roughly 905 cubic inches.

Not many people have Supah valves these days, I've gathered that they're a bit of any oddity. If your going for 3" bore though, a bit larger porting could be in order.
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Unread postAuthor: ShowNoMercy » Tue Jan 29, 2008 9:38 pm

Nah I am using a 2 inch bore, based off of the caulk tubes I plan on using as ammo. If I get it all working I may have enough inertia to start fabricating a recoil operated action but thats a ways off. And the supah is almost two years old, still working great.
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