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New Project: Wire-Controlled Air Burst Cannon

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: D_Hall » Fri Jun 27, 2008 7:13 pm

SEAKING9006 wrote:As long as I use strong enough fishing line, it should work.

As long as you use strong enough fishing line.... True.

I gather than that you're going low pressure and minimized accelerations? IE, deliberately low performance?
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Unread postAuthor: SEAKING9006 » Fri Jun 27, 2008 7:25 pm

I'm going for grenade launcher rather than anti tank gun, if that's what your asking. And yeah, 25-50psi is where I normally run my cannons. That limitation is mainly based on the low capacity of my compressor, 3 gallons. As long as it will shoot out of the cannon, with a good trajectory, that's fine. If I need to bring the pressure higher, I'll just use heavier line.
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Unread postAuthor: sandman » Fri Jun 27, 2008 10:56 pm

yes fishing string is strong, but it just will not stand up to rapid acceleration
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Unread postAuthor: psycix » Sat Jun 28, 2008 5:36 am

I would attach the rope outside the front end of the barrel, and then have the rope simply go into the barrel.
Instead of having the spool outside the barrel, why not just throw in all rope and shoot that too? No more inertia problems.
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Unread postAuthor: Spuddin » Sat Jun 28, 2008 8:31 am

great idea here, i would love to see a prototype in action. i honestly think the line will break at the breach hole. why not use the tried and tested working model of a fishing bow. i made one a few years ago and it works great. just a good zebco 303 or something similar, not a open face reel. but it must be mounted at the muzzle on the outside.
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Unread postAuthor: SEAKING9006 » Sat Jun 28, 2008 4:00 pm

I've drawn up the 3'rd version of the concept (2nd wasn't drawn) and I'm adding it now. In this revision, there is no breech hole. A piece of 1 1/2" with a threaded port for access will hold the spool internally. The entire barrel/tee/reel housing will all be one piece, secured to the valve with a union. A small piece of 3/4" sticking up will likely be attached to keep it straight.
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Unread postAuthor: psycix » Sun Jun 29, 2008 3:30 am

Why not put that spool on the left side of the T (behind the ammo) so its fired along?
That way the projectile has to pull less on the string to accelerate it.
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Unread postAuthor: SEAKING9006 » Sun Jun 29, 2008 5:05 pm

I may use that idea later, but I'm focusing on a simple projectile that doesn't have too terribly many aerodynamic efficiency. As it is, the cannon will have relatively low performance.
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Unread postAuthor: SEAKING9006 » Tue Jul 01, 2008 1:38 pm

I am set to build the first prototype. All I need are fittings and a few different diameters of pipe. I can't wait to test it!
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Unread postAuthor: SEAKING9006 » Tue Jul 22, 2008 9:30 am

UPDATED, see first post.
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Unread postAuthor: SEAKING9006 » Thu Jul 24, 2008 10:22 pm

UPDATED, cannon complete.
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