From: utzoo!decvax!cca!David.Smith@CMU-10A@sri-unix
Newsgroups: net.space
Title: Specific impulse & chamber pressure
Article-I.D.: sri-unix.1457
Posted: Thu May 13 22:02:22 1982
Received: Fri May 14 05:33:26 1982

From: David.Smith at CMU-10A (C410DS30)
I have read a couple of times (AW&ST, not recently) that the SSMEs
develop a chamber pressure of 300 bar (atmospheres).  I have also
read a couple of times (FLIGHT International) that the Ariane's first
stage engines develop about 55 bar.  Is such a difference credible?
I would expect exhaust velocity and specific impulse to be directly
related to the chamber pressure.  Such a difference in specific
impulse seems hard to swallow.