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Old January 2nd, 2012, 01:13   #16
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Super good info in this thread! Thanks a lot guys....

Just
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Old January 2nd, 2012, 02:18   #17
voorhees -FWA-
 
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hey there, sorry to interject again... but something has been bugging me about the rocket valve thing...

If I took the rocket valve out of my KWA M9 or 1911 and pressed the trigger, the entire mag should vent right? I'd do this but I don't really want to strip down my pistols to test this.

Also, if i took the NPAS out of my WE M16 or the stock plastic valve out of my WE SCAR, inserted a mag and pressed the trigger... the entire mag should vent?

You guys were very clear on the workings; I just need to know if this is what happens...

Thanks!
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Old January 2nd, 2012, 02:33   #18
Daiviet
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Quote:
Originally Posted by voorhees -FWA- View Post
hey there, sorry to interject again... but something has been bugging me about the rocket valve thing...

If I took the rocket valve out of my KWA M9 or 1911 and pressed the trigger, the entire mag should vent right? I'd do this but I don't really want to strip down my pistols to test this.

Also, if i took the NPAS out of my WE M16 or the stock plastic valve out of my WE SCAR, inserted a mag and pressed the trigger... the entire mag should vent?

You guys were very clear on the workings; I just need to know if this is what happens...

Thanks!
Pretty much
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Old January 2nd, 2012, 02:57   #19
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yes.

To simplify, it takes gas to cycle the gun. it takes gas to push the bb out of the barrel.

firing with no bb: only needs enough gas to cycle

firing with bb: gas to cycle + gas to push the bb down the barrel.
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Old January 2nd, 2012, 08:49   #20
voorhees -FWA-
 
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This blows my mind...

I've fix GBB's GBBR's, completely stripped and rebuilt them - if it's broke I can fix it... I guess I only assumed that the gas used was always the same, as when the hammer hit the striker valve, I've never really noticed any difference.

I will be upgrading my WE SCAR to open bolt and NPAS, so I will try this once with a lightly filled magazine and see what happens before I do the upgrade, I need to see this in action!

Thanks guys.
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Old January 3rd, 2012, 13:44   #21
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OK, I just took the lower reciever off my WE SCAR L, inserted a mag, and pressed the trigger - no upper. The entire mag vented and I am now satisified as to validity of the original claims about the way the gas is vented after the striker valve is hit.

Neat experiment. Thanks!
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Old January 3rd, 2012, 13:52   #22
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Originally Posted by voorhees -FWA- View Post
OK, I just took the lower reciever off my WE SCAR L, inserted a mag, and pressed the trigger - no upper. The entire mag vented and I am now satisified as to validity of the original claims about the way the gas is vented after the striker valve is hit.

Neat experiment. Thanks!
Note: this also works with pistols with the slide removed (and is not recommended to do...)
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Old January 3rd, 2012, 14:51   #23
m102404
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You might want to take a read through this. Most of what you're talking about is the Negative Pressure Air System.

http://redwolfairsoft.com/redwolf/ai...l?reviewID=199

In short...in the gun, how much gas is expended by each shot is determined by the length of the barrel, the weight of the BB, and fine tuned with the floating valve spring and to a minor extent the weight of the floating valve. In the mag it's the ability of the main valve to flow gas into the guns system. It's all a balance...you will end up with a messed up gun if you used (for example) a really light spring and a heavy float valve.

If you want a really good look, and chance to fiddle, take a TM Hicapa and closely examine the movements of each part. When/how/what causes each part to move, etc...
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