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Tennis Ball Combustion Cannon

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: SpudBlaster15 » Wed Jun 20, 2007 1:57 pm

2.5" SDR 21 (good luck finding it!) fits tennis balls WAY better than 2.5" Sch 40. The fit is not tight enough to burn the balls in any manner.
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Unread postAuthor: jimmy101 » Wed Jun 20, 2007 3:56 pm

noname wrote:Yeah, it's getting sticky and hard to unscrew now. I'll just get a new plug today.

You might spend some time and clean up the threads on the plug and the fitting. Sometimes there is a pretty severe "flash" ridge in the threads. This keeps the cap from screwing on properly since it seizes up way to early.

Latke talks about cleaning up the threads on his site.
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Unread postAuthor: joannaardway » Wed Jun 20, 2007 4:01 pm

markfh11q wrote:The pressure rises enough to get the ball moving before the flame front reaches the back of the tennis ball.

That's unlikely to be the reason. The more likely factor is that after the propane has completed combustion, there is no oxygen left for the tennis ball to burn in.
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