At 03:54 PM 10/2/02 -0500, John Carmack wrote:
>A word of warning -- you may be designing a bit weak on the engines. Our
>original lander only held 8L of peroxide, and it used four 30 lbf
>engines. Realize that all your engines won't be firing equally, which
>reduces your lift capacity, pressure will decay with blowdown, and it sure
>does make flying the vehicle easier if you have at least a delivered T/W
>of 2 at the end of the flight.
POGO will be constant pressure, not blow-down. Planned deliverable
T/W at liftoff will be 1.5; one of our big design challenges will be
getting the engines to throttle low enough to land. It's intended to have a
pretty good mass fraction -- probably higher than most HPR rockets.
>What is the current plan for landing gear? I just ordered some mroe wire
>rope isolators for our tube vehicle. I think the multi-axis absorption is
>just about ideal for a VTVL testbed.
Probably styrofoam balls or some similar cheap shock absorbing
material. Not sure.
-p
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