Sorry, you lost me at molecules. I was just trying to make it understandable without unnecessary gobbledegook. The only true way of knowing is to try it.
Sorry, you lost me at molecules. I was just trying to make it understandable without unnecessary gobbledegook. The only true way of knowing is to try it.
OK do you agree that any air below the regulator is not unusable? Since shooting below the reg would change the velocity?
By your calculations the 480 tank has 4.237cf (at 3625) and the 500 tank has 3.884 (at 3190) so this is a difference of 9% - (4.237/3.884 - 3.884/3.884)
Now the 480 tank should have a capacity of 2.1cf at 1800psi and the 500 tank has 2.199 at 1800psi. This is the unusable air.
If we take the unusable air away we have the following 480=2.137 and the 500=1.692cf. This usable air difference is 25.9% (2.137/1.692 - 1.692/1.692)
If we go to 2000psi then the capacity of each is 480=2.338 and the 500=2.435.
If we subtract this 2000psi of unusable air we get usable capacities of 480=1.899cf and the 500=1.449 which is a difference of 31% (1.899/1.449 - 1.449/1.449)
Now run the reg all the way up to 3180psi. The 500 bottle now has .014cf but the 480 has .52 which is 37 times the amount of air.
Using these equations you should be able to see that as the reg pressure goes up so does the additions percentage of usable air with the higher pressure vessel.
Apologies to BigTinBoat. I recalculated subracting the unused air from each bottle at 1800 PSI or 124 bar and compared the remainder. my figures came to 60480 cubic centimetres for the carbon bottle and 48000 cubic centimetres for the aluminium unit, yielding just over 20% decrease in available and usable air. I found it easier to use alll metric than converting into cubic feet and psi. Although my figures don't exactly match yours, they are a lot closer than my previous estimate. I'm still suprised that it is so high for such a small increase in overall capacity
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