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B&A Rifle Final Plans

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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B&A Rifle Final Plans

Unread postAuthor: Acdcmonkey1991 » Mon Apr 02, 2007 6:26 pm

This is the FINAL design for the cannon/rifle I'm building this weekend. Instead of the old design, the chamber is now 3 in. X 12 in. At 150 PSI the GGDT says I can get 106 foot pounds and 550 fps with a 50 gram projectile. The valve is a modified sprinkler with a 1/4 in. ball valve actuator. The barrel is 30 in. long and is shc. 40 3/4 in. PVC. It is now also a muzzle loader due to its raw power. :twisted: :twisted: :twisted:
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rifle model.JPG
This is the new...
Notice the new stock design and the safety valve
rifle model.JPG (17.45 KiB) Viewed 856 times
riflesz.JPG
This is the old...
riflesz.JPG (24.46 KiB) Viewed 856 times
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Unread postAuthor: PVC Arsenal 17 » Mon Apr 02, 2007 8:13 pm

There will be some dead space in that design. How bout you bridge the upper and lower parts of the stock and plug the rest.
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Unread postAuthor: spudthug » Mon Apr 02, 2007 8:33 pm

that dead space wont matter because the valve is at the barrel...if the valve was at the chamber isnt that dead space??? (i know i am probly wrong but thats always what i thought) yell at me if u want but thats what i thought...maybe (most likely) im wrong...correct me
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4" piston valved cannon-half done..( i spilt my cement...)

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Unread postAuthor: Acdcmonkey1991 » Mon Apr 02, 2007 8:42 pm

I'm probably going to cut a custom piece of wood to put in between the sock and then glue it in between.
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Unread postAuthor: Hotwired » Mon Apr 02, 2007 8:42 pm

No, you're right.

Dead space is empty space that has to be pressurised by the released gas before it reaches the projectile.

There shouldn't be a problem with having the stock pressurised.
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Unread postAuthor: skinner » Mon Apr 02, 2007 9:26 pm

Flow restriction might be a factor, it would be more economical to take the shortest route, such as from the chamber, 2 x 90° elbows, then to the valve, and attach a stock on the back, like so........

Image

or similar.

good luck.
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Unread postAuthor: PVC Arsenal 17 » Tue Apr 03, 2007 3:34 pm

spudthug wrote:that dead space wont matter because the valve is at the barrel...if the valve was at the chamber isnt that dead space??? (i know i am probly wrong but thats always what i thought) yell at me if u want but thats what i thought...maybe (most likely) im wrong...correct me



You're right. I'm not all there sometimes.
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Unread postAuthor: Acdcmonkey1991 » Tue Apr 03, 2007 4:53 pm

The stock is actually part of the tank.
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