In article ,
Ron Wanttaja wrote:

On Sun, 06 Mar 2005 23:33:48 -0500, Dan Nafe wrote:
[snip]
Doesn't the vehicle get lighter as fuel and oxidizer are consumed,
requiring less thrust, lowering the consumption rate...

Exactly, but the basic rocket equation takes that into account:

Fuel = Initial Mass * (1 - 1/(e^(Delta-V/(ISP * g)))

Ron Wanttaja

I guess that is why you are a rocket scientist.

Dan "Damn-it-Jim,-I'm-a-doctor" Nafe