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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 Maas 

Your 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.