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Basic Tennis Ball Cannon

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Basic Tennis Ball Cannon

Unread postAuthor: MrCrowley » Mon Aug 09, 2010 2:36 am

Just a little something I made with one of the 2" sprinkler valves I picked up. Even though the valves are 27 years old, they cleaned up really well and this one works fine. Not anything special really, just a 2" sprinkler valve (guide rod removed, piloted by 1/2" ball valve), a 3'x2" chamber and a 3.3' tennis ball cannon (65mm PN12 PVC). Also fits soda cans perfectly.

Can't be bothered painting it, this is just a fun cannon to use everynow and then. Pressure gauge has since been added. GGDT says 120m/s muzzle velocity with a tennis ball.
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Unread postAuthor: wyz2285 » Mon Aug 09, 2010 3:41 am

looks good,well done.the valve is 27 years old :o !?
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Unread postAuthor: SpudBlaster15 » Mon Aug 09, 2010 12:25 pm

Damn, that thing is cleanly built.

That is all. :P
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Unread postAuthor: MrCrowley » Mon Aug 09, 2010 3:16 pm

:D

By the way, 100 spudbux to anyone who can guess from which cannon of mine the 1/2" ball valve and 2" chamber came from. :wink:
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Unread postAuthor: MrCrowley » Fri Aug 13, 2010 2:53 am

Two new videos + two new photos.
[youtube]http://www.youtube.com/watch?v=YfHtrX4_Sxo[/youtube]
[youtube]http://www.youtube.com/watch?v=fpgaCLWu__M[/youtube]
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Surprisingly, I still can get it to seal and pump it up in under a minute with a track pump.
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 13, 2010 3:16 am

Fantastic stuff!

Since you have the benefit of using half soda cans as perfect lightweight sabot, I think some buckshot rounds are in order :D :D :D
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Unread postAuthor: MrCrowley » Fri Aug 13, 2010 3:21 am

jackssmirkingrevenge wrote:Fantastic stuff!

Since you have the benefit of using half soda cans as perfect lightweight sabot, I think some buckshot rounds are in order :D :D :D

Now that I think about it, I do have ~100 1/2" lead fishing sinkers... :D

Any suggestions on the loading? I'm thinking half a soda can with a dozen sinkers and a plastic bag scrunched up at the front to keep them in...
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 13, 2010 3:28 am

That would have been my first suggestion, make sure that they care evenly distributed and pressed against the bottom of the can so that they won't destroy the sabot on firing...
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Unread postAuthor: Zeus » Fri Aug 13, 2010 6:16 am

I like this, a sprinkler valve to pilot a sprinkler valve.

Should use a piston valve.

No primer stain. Praise the Lordy
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Unread postAuthor: MrCrowley » Fri Aug 13, 2010 6:23 am

Zeus wrote:Should use a piston valve.

Hence the basic part haha. I probably could've saved quite a bit of money by just making a tennis ball barrel for my VAL cannon (1.5" porting piston valve) but I wanted something portable (can't get the piston to seal on the VAL using a track pump since I added the 1" sprinkler valve to pilot it) and I had four 2" sprinkler valves to use :P

Trivia: At my local plumbing store, they wanted $50NZD for a 65mmx50mm bushing (for the barrel), so instead I heated up the end of the barrel and a 50mm slip-socket male threaded adapter and managed to get it to fit inside the 65mm barrel and then once it cooled I removed it and glued it in.
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Unread postAuthor: Zeus » Fri Aug 13, 2010 6:34 am

I meant as a pilot, because it's normally the other way around.

Just my sense of humour.

MrCrowley: Sticking it to the ripoff merchants.
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Unread postAuthor: MrCrowley » Fri Aug 13, 2010 6:38 am

Zeus wrote:I meant as a pilot, because it's normally the other way around.

Just my sense of humour.

Ahh I see. Yeah I probably could. Only reason I changed from ball valve to sprinkler was ease of trigger. GGDT says no noticable performance increase though.
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Unread postAuthor: SpudBlaster15 » Fri Aug 13, 2010 12:19 pm

Nice videos. I second JSR's buckshot round suggestion. A half soda can sabot and a couple dozen marbles would be interesting.
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Unread postAuthor: MrCrowley » Sat Aug 14, 2010 7:36 am

Didn't have the chance to do a buckshot today but I did have some more fun with soda cans:
(may be still processing on YouTube...)
[youtube]http://www.youtube.com/watch?v=CmSCAVV6bAA[/youtube]
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Unread postAuthor: SpudFarm » Sat Aug 14, 2010 7:46 am

Nice!
I just had to comment on your hipfire skills :O You should belong to the mafia..

Other then that, is there any way you could get your hands on one of the Casio high speed camera series? I would love to see those soda can sabots exiting the barrel.
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