Re: Re : To the moon.....

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Article #3860

#3860

From: no, I don't repeat it!
Date: Mon, 25 Jan 1993 21:22

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In article <727907500snz@chrism.demon.co.uk> chris@chrism.demon.co.uk (Chris Marriott) writes:

>Your equation is too simplistic - it only really applies either in the
>absence of gravity, or if the velocity change occurs instantaneously
>(ie, an "impulse").  If the fuel is burned over a finite time, you
>have to take into account the losses due to gravity and (if in atmosphere)
>friction.

True, I should have mentioned that. The losses due to gravity and
atmospheric friction are comparable to a velocity change of about
1500 m/s and have to be taken into account. Otherwise, however,
the equation is right.

Btw, after getting to LEO, the burning rate of the fuel makes no
difference to total velocity change acquired from it.

	Pauli
--
Disclaimer fault - lawyers dumped

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References: <PAULI.RAMO.93Jan24190410@vipunen.hut.fi> <727907500snz@chrism.demon.co.uk>

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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!news.funet.fi!funic!nntp.hut.fi!nntp!Pauli.Ramo
From: Pauli.Ramo@hut.fi (no, I don't repeat it!)
Subject: Re: Re : To the moon..... 
In-Reply-To: chris@chrism.demon.co.uk's message of Sun, 24 Jan 1993 20:31:40 +0000
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References: <PAULI.RAMO.93Jan24190410@vipunen.hut.fi> <727907500snz@chrism.demon.co.uk>
Date: 25 Jan 93 21:22:27
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