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how much pressure to fire a tennis ball 15m?

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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how much pressure to fire a tennis ball 15m?

Unread postAuthor: blandy10 » Sun Apr 15, 2012 2:34 am

Hi everyone! Im doing a school project and what im making is a pneumatically powered spud gun (obviously). I was just wondering, roughly how much psi would I need to fire a standard tennis ball a reasonable distance? (15+ Meters or about 49 Feet)
Please help!
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Unread postAuthor: Crna Legija » Sun Apr 15, 2012 2:58 am

Changes with the dimensions of the cannon, download GGDT read the instructions on the usage page then run the numbers.
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Unread postAuthor: POLAND_SPUD » Sun Apr 15, 2012 3:05 am

short answer ? Not much
achieving 15meters is not a problem
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Unread postAuthor: MrCrowley » Sun Apr 15, 2012 4:50 am

The amount of psi required is inversely proportional to the length of a piece of string.

Buy 3' of PVC pipe that fits a tennis ball. Use 1.5' for the barrel and 1.5' for the chamber. Attach a sprinkler valve between the two pieces of pipe. Pressurise to ~20PSI and then fire. You should get 15m out of such a design.
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Unread postAuthor: blandy10 » Sun Apr 15, 2012 6:47 pm

thanks guys! ill try that out!
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Unread postAuthor: beastmode986 » Sun Apr 15, 2012 7:46 pm

make a ball valve cannon and fill it to 50 psi you should get 50ft if you open the ball vaalve fast
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Unread postAuthor: Gun Freak » Mon Apr 16, 2012 5:24 pm

I'm thinking you won't even need a sprinkler valve, I'd go with a ball valve, 3/4" should do.
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Unread postAuthor: MrCrowley » Mon Apr 16, 2012 5:26 pm

Just thinking...why not go with a slingshot?
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Unread postAuthor: Gun Freak » Mon Apr 16, 2012 5:30 pm

MrCrowley wrote:Just thinking...why not go with a slingshot?

school project

Build a cannon ->> look awesome.
Make a slingshot ->> look lame! Unless you build a Sprave slingshot which I highly doubt :D
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Unread postAuthor: Zeus » Mon Apr 16, 2012 8:44 pm

In my experience one's arm does a fine job of launching a tennis ball, with variable range too!
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Unread postAuthor: blandy10 » Fri Apr 20, 2012 5:18 am

I should probe add some more detail, Im planning to make the entire thing remotely activated, that means it is able to raise, lower and possibly even pivot remotely, if it works it will be pretty awesome!
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Unread postAuthor: inonickname » Fri Apr 20, 2012 9:11 pm

If you want to do some math (seen as it's a school project) give me a bell and I'll be happy to give you a hand.
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Unread postAuthor: shardbearer » Tue May 01, 2012 8:30 pm

For remotely activated, use a sprinkler valve and leave the solenoid pilot valve on.
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Unread postAuthor: 8tonsemi » Wed May 02, 2012 4:24 pm

You will need at least 50 PSI.
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Unread postAuthor: Technician1002 » Wed May 02, 2012 6:16 pm

^^^^ only with a restrictive valve. Much lower pressure can reach that far.
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