home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.space.shuttle
- Path: 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
- Message-ID: <PAULI.RAMO.93Jan25212227@vipunen.hut.fi>
- Sender: usenet@nntp.hut.fi (Usenet pseudouser id)
- Nntp-Posting-Host: vipunen.hut.fi
- Reply-To: Pauli.Ramo@hut.fi
- Organization: /u/opi/s/ramo/.organization
- References: <PAULI.RAMO.93Jan24190410@vipunen.hut.fi> <727907500snz@chrism.demon.co.uk>
- Date: 25 Jan 93 21:22:27
- Lines: 19
-
- 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
-