Article View: sci.space
Article #7623Re: Specific Impulse
From: David desJardins
Date: Tue, 14 Oct 1986 21:55
Date: Tue, 14 Oct 1986 21:55
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In article <748@hplabsc.UUCP> dsmith@hplabsc.UUCP (David Smith) writes: >> >> I = m V / m g = V / g >> sp e o e o > >But why is it defined with that silly g-naught in the denominator? >(all together now!) > > TO JUSTIFY MEASURING IT IN SECONDS! David Smith is clearly right. The *only* possible justification for introducing a factor of g0 -- a completely arbitrary constant from the point of view of, say, a lunar lander! -- is to make things simpler for those who use the English system and don't know enough to distinguish between pounds and pounds-mass (or slugs). That it has always been done that way is no excuse. The misunder- standings of the past are no justification for continuing a source of confusion in the future. -- David desJardins
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!linus!philabs!cmcl2!seismo!think!nike!ucbcad!ucbvax!cartan!brahms!desj From: desj@brahms (David desJardins) Newsgroups: sci.space Subject: Re: Specific Impulse Message-ID: <14@cartan.Berkeley.EDU> Date: Tue, 14-Oct-86 17:55:06 EDT Article-I.D.: cartan.14 Posted: Tue Oct 14 17:55:06 1986 Date-Received: Thu, 16-Oct-86 08:23:24 EDT References: <8610131130.AA10458@s1-b.arpa> <748@hplabsc.UUCP> Sender: daemon@cartan.Berkeley.EDU Reply-To: desj@brahms (David desJardins) Organization: Math Dept. UC Berkeley Lines: 20