From: utzoo!decvax!cca!OTA@S1-A@sri-unix Newsgroups: net.space Title: Specific Impulse of SSMEs Article-I.D.: sri-unix.1447 Posted: Wed May 12 01:47:29 1982 Received: Thu May 13 00:49:34 1982 From: Ted AndersonThe specific impulse of the Space Shuttle Main Engines is very close to 450 seconds. There is some variation between engines and so forth, but I think the variation amounts to less than 5 seconds. I don't know the number for the SRBs, but I'd estimate between 250 and 300 seconds. Ted Anderson