GTA

All Springer/NP/PCP Air Gun Discussion General => "Bob and Lloyds Workshop" => Topic started by: JPSAXNC on June 01, 2018, 02:51:57 PM

Title: Need help calculating bar-cc/FPE
Post by: JPSAXNC on June 01, 2018, 02:51:57 PM

Here's the shot string. 742 740 746 744 746 744 751 750 743 750 750 747 746 749 740 741 732 746 742 746 742. 21 shots. the pellet 14.3 grains  fill pressure was 2500psi. ending pressure was 1470psi. the pressure drop was 70 bar, the reservior volume is 80 cc's the average velocity was 744fps. the average FPE. was 17.5 FPE. Thanks, James

Title: Re: Need help calculating bar-cc/FPE
Post by: JPSAXNC on June 01, 2018, 03:38:40 PM

Correction sorry, The pressure drop was 100bar.

Title: Re: Need help calculating bar-cc/FPE
Post by: rsterne on June 01, 2018, 09:43:51 PM

21 shots x 17.5 FPE avg. FPE = 367.5 FPE

2500 psi - 1470 psi - 1030 psi / 14.5 = 71.0 bar drop

71.0 bar x 80 cc = 5680 bar.cc

5680 / 367.5 = 15.46 bar.cc/FPE

Bob

Title: Re: Need help calculating bar-cc/FPE
Post by: JPSAXNC on June 01, 2018, 10:49:23 PM

Thank's Bob, That's a big help.