Re: SPACE: Launch from ULDB?

From: Spike Jones (spike66@attglobal.net)
Date: Thu Mar 15 2001 - 09:03:43 MST

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ooops dropped a negative sign in the first equation. Guess
Im just a positive kinda guy... {8^D spike

Spike Jones wrote:

> mass fraction ~ exp(9100/Ve)

bzzzst. mass fraction ~ exp(-9100/Ve). Got it right the second
time tho:

> ...
>
> Then the mass fraction is exp(-9100/exhaust velocity).
> The exhaust velocity is about 3600 on the deck and...

Recall that exhaust velocity is G times the specific thrust.
Mass fraction here is the (not-fuel)/(total mass on the pad). spike

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