On Thu, 5 Sep 2002 21:16:46 +0200, Hans Ulrich Ammann
<[EMAIL PROTECTED]> wrote:
>In most newer ESA publications they use [Ns/kg].
Which exactly matches the definition of specific impulse: impulse per
unit mass of propellant. Makes coding the sims a whole lot easier
when you keep your units straight.
>As [N] = [kgm/s^2] you end up with [m/s] as an unit for specific trust.
I believe this is called effective exhaust velocity. Lower than
actual exhaust velocity, but more useful in talking about vehicle
performance.
>The number is 9.81 times that in seconds.
That's they key. :-) "You lie! You did not get 1150 seconds out of
a peroxide engine!" "Uh, no. Seconds? Lessee... 117 seconds.
Better?" "Don't *do* that." :-)
-R
--
"Sutton is the beginning of wisdom -
but only the beginning."
-- Jeff Greason
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