Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!burl!mgnetp!ihnp4!houxm!houxz!vax135!floyd!cmcl2!seismo!hao!hplabs!sri-unix!REM@MIT-MC From: REM%MIT-MC@sri-unix.UUCP Newsgroups: net.space Subject: Rocket thrust Message-ID: <929@sri-arpa.UUCP> Date: Sat, 16-Jun-84 17:50:00 EDT Article-I.D.: sri-arpa.929 Posted: Sat Jun 16 17:50:00 1984 Date-Received: Fri, 22-Jun-84 09:27:51 EDT Lines: 8 From: Robert Elton MaasYour argument has a serious flaw. If exhaust gas is slowed by frictin with air, it's transferring momentum to the air it slides against, thus total momentum isn't decreased by this friction. In fact if the chemical reaction in the engine resists this backpressure by pushing harder on the exhaust gas to try to foce them to keep their original velocity, the total momentum of the exhaust&FrictionnedAir will be greater.