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Air power vs Combustion power for tennis ball 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: Antonio » Thu Jan 31, 2008 5:37 am

I wouldnt go with air or combustion. Using a mechanism is way easier. Why not build something with two flywheels power by an electric motor or something. Isnt that how the real machines work. Here is a cool vid of a person which used bike parts to make a tennis shooter:
[youtube]http://www.youtube.com/watch?v=LBxUjBUdQ5o[/youtube]
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Unread postAuthor: Novacastrian » Thu Jan 31, 2008 5:57 am

That is a very cool bit of kit ant, now to buy a couple of bike parts...
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Unread postAuthor: jimmy101 » Thu Jan 31, 2008 11:34 am

The link BigGrib posted would be an excellent starting point. Lots of good ideas including the breach loader setup. (Add a T and you've got a place for a magazine.)

A smaller sprinkler valve, 1" or even 1/2" would work fine for your use. The sprinkler valve's standard electrical activation would work fine as well.

Any kind of valve that is more efficient than a ball valve or sprinkler valve is probably not only overkill for what you are trying to do but is also too dangerous for firing at a person. WAG for BigGrib's gun, I would say it'll launch a TB at perhaps 500 FPS (~340 MPH). That is more than three times faster than a major league baseball pitcher can throw a baseball. Roughly ten times the kinetic energy of that major league pitcher. Definitely in the energy range that would be far to dangerous to launch at a person.
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Unread postAuthor: origin unknown » Thu Jan 31, 2008 5:15 pm

I suggest a sprinkler valve pneumatic with a very small chamber for quick pressurizing by hand and a very short barrel to keep power down all in an over/under configuration and a pop-safety valve made to open at whatever pressure is safest in your case. Hope all goes well with your project.
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Unread postAuthor: biged » Thu Jan 31, 2008 7:52 pm

1.5" valve, 2.625" ID barrel, 11 gallon air tank.
Barrel support is adjustable for 1.5"x6', 2"x8', and 3"x10' barrels.

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Not finished with it yet. $70 so far.

///ed///
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Unread postAuthor: nicetoentice » Fri Feb 01, 2008 12:01 am

Yes, lots of great ideas to start with.
I like BigGrib link also http://www.spudfiles.com/forums/viewtop ... tml#153709

The " T " as a place for a magazine is nice too.

Now I just need to see if adding a CO2 tank supply would work.Kind of the same line as a T-shirt launcher.

I like to see some close up photos of the breach loader.

Great ideas,thanks to all for a little more enlightenment.

The bike mechanism thing is cool too....seems like more work for me after then the goalie :lol:

Again thanks, the more post the more ideas to work with :D
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