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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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Tennis Ball Combustion Cannon

Unread postAuthor: Jumpin Jehosaphat » Tue Jun 19, 2007 5:48 pm

I want to make a hand-held combustion cannon because the little propane bottles are more portable than carrying around an air compressor.
I was wondering whether tennis balls safe to use in a combustion cannon, or if they will burn.
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Unread postAuthor: noname » Tue Jun 19, 2007 5:55 pm

They smell disgusting and if makes the end plug blast out of the chamber instead of the ball leaving the chamber, but they're fine other than that. :D
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Unread postAuthor: Jumpin Jehosaphat » Tue Jun 19, 2007 6:12 pm

Hmm, I might be better off using a CO2 pneumatic gun... but that can expensive.
Maybe I could just shoot golf balls with a combustion.
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Unread postAuthor: noname » Tue Jun 19, 2007 6:23 pm

I'm sure if you had the end plug in there really tight it would be fine, it's just that tennis balls fit really tightly in 2 1/2" PVC.
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Unread postAuthor: boilingleadbath » Tue Jun 19, 2007 8:42 pm

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Unread postAuthor: lukemc » Tue Jun 19, 2007 9:06 pm

noname wrote:I'm sure if you had the end plug in there really tight it would be fine, it's just that tennis balls fit really tightly in 2 1/2" PVC.


what? are you talking about making a cannon and not solvent welding??
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Unread postAuthor: noname » Tue Jun 19, 2007 9:13 pm

I have no idea where you got that from. I only screwed in the plug about 2 and a little bit of the threads and it got blown out. Why wouldn't I solvent weld something?
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Unread postAuthor: Flying_Salt » Tue Jun 19, 2007 9:21 pm

It will kick really hard and be loud. Why not?

A simple pneumatic can be made cheaply, unless you drop you tools in there then glue it up or something...
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Unread postAuthor: lukemc » Tue Jun 19, 2007 9:21 pm

Image
this is an end plug.....
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Unread postAuthor: ammosmoke » Tue Jun 19, 2007 9:48 pm

Erm, he meant a cleanout plug.......
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Unread postAuthor: noname » Tue Jun 19, 2007 10:02 pm

Yeah, what Ammosmoke said. I thought it would be rather obvious, I guess I was wrong.
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Unread postAuthor: pyromaniac » Tue Jun 19, 2007 10:55 pm

If i remember corectly wow made a cannon on compresed propane.

since you dont want to spend money on a reg and you dont want groass tennis balls this may work.
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Unread postAuthor: mark.f » Wed Jun 20, 2007 9:22 am

Either way you cut it, (pneumatic or combustion), the tennis balls will burn. The friction inside the barrel being launched burns the fuzz on the edges of the ball. I, really, have only noticed black spots on the "back" of my tennis balls whenever I use a rich mix, since the spark is at the back of my chamber. The pressure rises enough to get the ball moving before the flame front reaches the back of the tennis ball.
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Unread postAuthor: jimmy101 » Wed Jun 20, 2007 11:00 am

Like markfh11q said, a combustion gun for tennis balls will work fine. Some scorching but not a big deal.

A threaded cleanout plug should not blow out of a standard combustion gun, it it does, something is seriously wrong with the plug.
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Unread postAuthor: noname » Wed Jun 20, 2007 11:07 am

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