Tennis ball launcher

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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farcticox1
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Atempting to make a low powered tennis ball launcher, couldn't find a suitable piece of pipe for the barrel so made my own from flat piece of stainless, not perfectly round and has a bit of a seam but I think it will do the job.
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mark.f
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I think it will too. For whatever it's worth, I say mount the barrel with the seam at the top and pray for a backspin. :D
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Moonbogg
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Very cool. I made a tennis ball cannon in high school from a rolled and welded sheet like that. It worked perfectly and I bet yours will too.
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biged
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Sorry for late response, just a heads up.

2-3/4" exhaust pipe from any auto parts store has a Inside Diameter of 2-5/8ths of a inch. ($30 to $50 for a ten foot piece.)
A tennis ball fits perfectly into them.
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