Search found 27 matches
- Wed Feb 10, 2010 12:36 am
- Forum: Pneumatic Cannons
- Topic: Which of these three designs would produce best performance?
- Replies: 6
- Views: 1771
- Mon Sep 21, 2009 11:53 am
- Forum: General How-To & Discussion
- Topic: New Blow Forward System?
- Replies: 10
- Views: 3584
http://www.zdspb.com/media/tech/animati ... 3_7fps.gif
That would work... actually it does ^^
With some calculation of the seat diameter ofcourse, so that your valve only fires after enough air went to the loading mechanism.
That would work... actually it does ^^
With some calculation of the seat diameter ofcourse, so that your valve only fires after enough air went to the loading mechanism.
- Tue Jul 28, 2009 6:11 pm
- Forum: Pneumatic Cannons
- Topic: Piston Valves Explained Visually
- Replies: 177
- Views: 296404
- Thu Jul 16, 2009 5:35 am
- Forum: Pneumatic Cannons
- Topic: Will a pneumatic cylinder keep up?
- Replies: 6
- Views: 1848
- Thu Jul 02, 2009 4:19 am
- Forum: Pneumatic Cannons
- Topic: Valve type...Piston, Shuttle or QEV?
- Replies: 12
- Views: 2891
- Wed Jul 01, 2009 4:41 pm
- Forum: Pneumatic Cannons
- Topic: A way to fill it with a single stroke of a hand pump?
- Replies: 3
- Views: 1187
I'll try to calculate it too :) I'm not used to using inches though... So I could be wrong :D Volume of the chamber of the gun: 1/4" x 1/4" x PI = 0.19634375 square inches 0.19634375 x 6" = 1.1780625 cubic inches Piston diameter? Compression ratio of 20:1 (like you calculated) => volume cilinder mus...
- Wed Jun 10, 2009 5:43 am
- Forum: General How-To & Discussion
- Topic: Self-closing piston valve (brass fittings)
- Replies: 66
- Views: 37311
- Tue Jun 09, 2009 2:00 pm
- Forum: General How-To & Discussion
- Topic: Carbon fiber tubing
- Replies: 6
- Views: 1826
I don't think this would make it to spudding... Pure carbon tubes are very sensitive, when you smack it you will make a dent in it and the fibres will then continue to rip. That's why most of the time they wrap the fibers around an aluminum core. How are you going to connect this tube to other tubes...
- Sat Jun 06, 2009 1:44 pm
- Forum: Pneumatic Cannons
- Topic: Piston and boltaction diagram
- Replies: 29
- Views: 7059
- Sat Jun 06, 2009 6:57 am
- Forum: Pneumatic Cannons
- Topic: full auto questions
- Replies: 6
- Views: 1544
To Thunderlord: I already suggested to make the bolt longer, so that it doesn't leak in the magazine. And the bolt HAS to seal, otherwise the chamber will keep leaking through the bolt. But, as I said it has to seal in front of the port, so that the air that remains in the pop-off tube can leak thro...
- Fri Jun 05, 2009 4:41 pm
- Forum: Pneumatic Cannons
- Topic: full auto questions
- Replies: 6
- Views: 1544
I think this design has a reasonable chance of working (It's always hard to predict :S). You will want to make sure though that the bolt is a little bit longer, so that the magazine is shut off when air can pass through. also make sure the bolt seals in front of the port, so that air trapped in the ...
- Fri Jun 05, 2009 4:02 pm
- Forum: Pneumatic Cannons
- Topic: Piston and boltaction diagram
- Replies: 29
- Views: 7059
Let me get something clear: Are you going to pull the bolt backwards, or push the barrel forwards? IMHO in any case, the barrel should be supported by the stock (Or slide mechanism if you push the barrel forward, but if you are a accuracy nazi, that will cost you a little accuracy. But it won't be n...
- Fri Jun 05, 2009 9:39 am
- Forum: Pneumatic Cannons
- Topic: Piston and boltaction diagram
- Replies: 29
- Views: 7059
The accuracy won't depend on how long the bolt slides over the barrel. (Unless you aim using the bolt, but that would be weird). Accuracy is more affected by the fit of the projectile, length of the barrel (So you can sight it better) and straightness of the barrel. It doesn't really matter much how...
- Thu Jun 04, 2009 11:30 am
- Forum: General How-To & Discussion
- Topic: Im tearing my hair out with this calculation!!!
- Replies: 18
- Views: 3456
What I would then do (And I'm by no means qualified, haven't even finished high school) is calculate the moles of gas in the chamber. Then subtract the moles of gad that needs to stay in the chamber (so if you want to regulate 50 psi, 50 psi should stay in the chamber). Next you calculate the moles ...
- Wed Jun 03, 2009 10:31 am
- Forum: General How-To & Discussion
- Topic: Im tearing my hair out with this calculation!!!
- Replies: 18
- Views: 3456
Dave_424 Gippeto tested the iron fitting s using his dead weight tester. While he didn't test a bell reducer, I think you would be safe, considering the other fittings withstood more than 8000 PSI (although you would need a safety margin of say 3, the fittings withstood nearly 4 (!) times your press...