1CC = 1fpe plenum to bullet energy "rule"
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1CC = 1fpe plenum to bullet energy "rule"
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Topic: 1CC = 1fpe plenum to bullet energy "rule" (Read 768 times))
Chickenthief
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Posts: 250
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Real Name: Henrik
1CC = 1fpe plenum to bullet energy "rule"
«
on:
January 12, 2020, 02:24:02 PM »
Hello Sir.
So how "firm" is this rule of yours?
Thing is that i'm having an Airforce Texan .45 TX2 and i thought that i "thought" of a neat addon.
In short replacing the bottle with a tube/plenum and have the shoulderstock include 2 90deg bends + an underlying carbon bottle. But since the AF has a 480cc bottle for a 700fpe gun i'm SOL for an upgrade and i think i just might go thethered like all the rest ;-)
Like Peter Sellers said in the film: Murder By Death. Angry man arguing with cow on wall, is like train without wheels, soon gowing nowhere. https ://youtu.be/ne9hTr5jwB4?t=44
Noob = no external links so omit the space between https and :// and you should be good!
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Re: 1CC = 1fpe plenum to bullet energy "rule"
«
Reply #1 on:
January 12, 2020, 02:47:08 PM »
This common base line of 1cc per ft-lb of power is spoken of in REGULATED PCP's and not those PCP's that take / use the entirety of the tanks volume to supply the shot.
As stated many times you can get away with 1/2 cc per ft-lb and still make high power, it just takes a higher set point pressure to extract the same power using just the air within a regulated guns plenum.
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Re: 1CC = 1fpe plenum to bullet energy "rule"
«
Reply #2 on:
January 12, 2020, 09:38:14 PM »
If the reservoir is only 1/2 cc per FPE, you will produce a bit less power from the same pressure than if the reservoir was 1 cc per FPE.... Consider this chart....
As you can see, the smaller the reservoir, the less power.... but it doesn't become a serious problem until you go below about 1/2 cc per FPE.... The drop from 1 cc per FPE down to 1/2 cc per FPE is about 8%....
Bob
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1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).
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All Springer/NP/PCP Air Gun Discussion General
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ezman604
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1CC = 1fpe plenum to bullet energy "rule"