Question on typical numbers for rockets
From: Del Cotter (del_at_branta.demon.co.uk)
Date: 07/16/04
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Date: Fri, 16 Jul 2004 21:12:29 +0100 To: sci-space-tech@moderators.isc.org
I'm playing with fantasy rockets for science fiction scenarios, and
I'm looking for some typical figures for rockets. What would you say
was a reasonable number for the following?
# volume flow rate
If an engine deals with a fluid having a density of 200 kilograms per
cubic metre and a mass flow rate of 400 kilograms a second, it would
have to have a volume flow rate of 2 cubic metres a second. Is this
a reasonable number for a LOX/LH2 engine? a LOX/kerosene engine?
# thrust to weight ratio
If an engine had a thrust of 1,800,000 newtons and a mass of 3,000
kilograms, it would have a thrust to weight ratio of 60, i.e. 600
newtons per kilogram. Is this a reasonable number for a LOX/LH2
engine? a LOX/kerosene engine?
# payload ratio
What would you say a reasonable ratio of payload to total initial
(i.e. fully-fueled) mass would be
a) for a two stage rocket
b) for a single-stage-to-orbit vehicle
(one percent? five percent?)
# structure mass/tank volume ratio
Not counting the engine or the payload, what is a reasonable mass for
a stage containing x cubic metres of fuel, where the fuel is
a)LOX/LH2 b)LOX/kerosene c)peroxide/kerosene?
# payload mass/volume ratio
For, say, a manned vehicle, how many cubic metres does a tonne
typically occupy?
-- Del Cotter Thanks to the overwhelming volume of UBE, I am now rejecting *all* email sent to del@branta.demon.co.uk. Please send your email to del2 instead.
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