| Will it work? |
| yes |
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83% |
[ 5 ] |
| no |
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16% |
[ 1 ] |
| leaks |
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0% |
[ 0 ] |
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| jackssmirkingrevenge |
 Posted: 06/11/2008 0:55 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 7050
11306.91 Spud Bux
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| I found the patent for the above mentioned cartridge - on firing, the bolt basically hits the cartridge inner body and moves it forward, thus opening the valve against the outer body, releasing the air and firing the projectile.
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| psycix |
| Posted: 06/11/2008 3:54 AM Post subject: |
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Major General
Joined: 25 Jun 2007
Posts: 1857
355.02 Spud Bux
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Altough the design is nice, it is not valveless. Its basically a sort of hammer valve where the barrel IS the hammer.
Note this gun would fire if you drop it on its back end or use it to poke something. 
To overcome the problem of all that pressure pushing, you could get a rod to the other side of the chamber and make an piston in some sort of extra chamber part.
| Description: |
| Design of the backforce piston. Note that the backforce piston diameter should be a lil smaller then the barrel thing. You dont want to neutralize all force. |
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| trollhameran |
| Posted: 06/11/2008 14:51 PM Post subject: |
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Colonel
Joined: 04 Dec 2007
Posts: 517
1250.77 Spud Bux
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| psycix: i think i understand your idea, would the piston have a pilot valve behind it? so that when you open the pilot the piston goes back and pulls the barrel with it? If thats how it would work, wouldn't it be more effective to just make a normal piston cannon?
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| jackssmirkingrevenge |
| Posted: 06/11/2008 15:07 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 7050
11306.91 Spud Bux
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| The point of the "backforce piston" is to reduce the load on the valve to make it easier to open...
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| Atlantis |
| Posted: 06/20/2008 17:07 PM Post subject: |
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Brigadier General
Joined: 03 Sep 2005
Posts: 956
5049.40 Spud Bux
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I know this topic is slightly old but I decided to go ahead and build a prototype of this design. I made it out of a 1.5" by 3/4" bushing, the neck of a 20oz pop bottle some 1/2" pipe and a 1/2" endcap, and a baloon neck for a seal. I imagine more professional materials could be use but this seems to work. I plan on lining this up with a bolt loading system so I charge the bolt then pull the trigger to push the bolt into the valve. The bottle neck was sawn off the bottle with about 1/8" left between the neck and the bottle, this little piece fits snugly inside the 3/4" socket of the bushing, I put an O-Ring between them and hotglued it in, it doesn't seem to leak at all.
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