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Improving performance on my Piston valve air 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: Lentamentalisk » Tue Mar 16, 2010 1:27 am

Well if he is stuck like that, lets hope his piston is pretty damn light.
With all the gear the soldiers were wearing, many drowned or had to shed it all before they could make it to shore.
In fact, during the filming of Saving Private Ryan, the actors were given wooden rounds to carry rather than real metal ones, because it was so incredibly impossible to move in the water with all the weight.
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Unread postAuthor: Metalcookie » Tue Mar 16, 2010 3:54 pm

No, I'm not stuck like that. Only in Texas am I stuc kin a battle field XD

Actually, I'm here because I've got many beloved relatives either with cancer or on hospice :(
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Unread postAuthor: Metalcookie » Sun Mar 21, 2010 10:21 am

Well, I figured out why it ain't shooting like it should be. I put a bigger 4 foot air tank on it along with a bigger barrel, and I wrapped the piston in tape to get a tighter seal, and It did perform better, but then I remembered it was shooting better with the first piston I made. ( I tried filliing it with hot glue, hoping the glue would keep it together :roll: the sealing face broke.) Then I weighed both pistons. the hot glue one did perform better, because it was much lighter.
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Unread postAuthor: Gun Freak » Sun Mar 21, 2010 10:41 am

Have you tried a bolt piston?
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Unread postAuthor: Technician1002 » Mon Mar 22, 2010 3:01 am

Having two places with the 1 inch restriction is bad. Think of them as in series. The one between the chamber and T can drop you delivered pressure by 1/2 or more since it contains a 90 degree bend. Make the chamber elbow and T 2 inch all the way up to the valve seat. I think you will notice the difference in delivered pressure without the restriction.

Use 2 inch air chamber into 2 inch elbow with a very short 2 inch pipe to join the elbow and T. It's now wide open and the weak elbow is eliminated and less likely to break off.

Remember the air from the chamber has to both move the piston and fill the space it used to occupy as well as eject the projectile. The movement of the 2 inch piston takes a few cubic inches of air to displace it.
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