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size vs. pressure

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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size vs. pressure

Unread postAuthor: covey12 » Mon Apr 26, 2010 2:52 pm

so i was just randomly thinking and figured i just put it up here, would there be a functional difference between a large chamber with low pressure ( around 50 psi) or a smaller chamber with a higher pressure ( say 400 psi) both holding the same amount of air, wouldn't the smaller chamber work better? i doubt it be much of a difference but it seems to me that it would
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Unread postAuthor: Demon » Mon Apr 26, 2010 2:53 pm

It depends on the projectile diameter .
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Unread postAuthor: SpudBlaster15 » Mon Apr 26, 2010 3:19 pm

A high pressure chamber is more efficient at transferring energy to the projectile, especially when the launcher is equipped with a relatively short barrel.

If both chambers contain the same amount of potential energy, the one filled to the higher pressure will yield better performance.
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Unread postAuthor: Technician1002 » Mon Apr 26, 2010 4:58 pm

The composition of your projectile may limit practical impulse energy delivered to the projectile. Many of the Pumpkin Cannons are limited in air pressure due to the soft nature of the projectile. To transfer the energy, a longer barrel is used (often near 100 feet) and a larger lower pressure chamber is used.

The construction of your launcher may provide additional limits. A soda can launcher at high pressure will provide a heavy recoil at high pressure. A higher volume chamber and lower pressure can limit the recoil force and still reach high muzzle velocities. A 7 foot barrel at 100 PSI gives a good solid recoil kick. A smaller chamber at higher pressure could become unmanageable for a hand-held launcher.
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 26, 2010 11:48 pm

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Unread postAuthor: Technician1002 » Tue Apr 27, 2010 12:22 am

Oops posted in the link bumping it. Post moved here where it belongs;

I like your numbers. I need to put together a fridge compressor for my Marshmallow cannon. In theory I can go to 300 PSI with it. With the 7 foot long TB barrel it should do a nice job.
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