View Single Post
Old 04-01-2017, 08:09 PM   #14
Anthony
 
Join Date: Feb 2005
Location: Berkeley, CA
Default Re: GURPS ULTRATECH ballistics?

Quote:
Originally Posted by DouglasCole View Post
I used the ideal gas law to figure out how the pressure falls off as the volume expands (the volume is the chamber plus the barrel) and then just integrated Force = Pressure x bullet area over the barrel length.
Pretty sure that doesn't work once the expansion rate is significant relative to the speed of sound in the gas; ideal gas law is for equilibrium.
__________________
My GURPS site and Blog.
Anthony is online now   Reply With Quote