"Mike Weller" wrote in message
news:1121443598.642f01f4298df066c5b035efb54d5426@o nlynews...
On Thu, 14 Jul 2005 13:14:22 -0700, wrote:


My recollection was that the turbopump used the engery in the expanding
fuel
to pump the fuel. If the fuel runs out doesn't the turbopump stop
pumping?

Mike
MU-2

There are a number of differnet ways that turbopumps
on rockets can be powered, what you are describing is an expander cycle,
the SSME is a staged combustion pump.

The pump is preburinign some small amount of fule to spin the turbine,
if I recall it's about 150,000 HP per pump per engine.
This is a lot of power.


The F-1 turbines for the engines on the Saturn V first stage each
produced, nominally, about 54,000 horses. Times five that is a huge
amout of power that needs to be harnesed. 7.6 Million pounds of
thrust was the result of that. Your Garretts should stand back in
awe.

Mike Weller


I can't afford to pay for 15 tons of fuel and O2 per second anyway.

Mike
MU-2