On Wed, 02 Oct 2002 14:22:25 -0700, Pierce Nichols
<[EMAIL PROTECTED]> wrote:
>Planned deliverable T/W at liftoff will be 1.5
I insisted on this based on sims of the Mk 0. You only need 1.2 to
take off, but you really need 1.5 to land safely. Since we want
intact abort, we need at least 1.5 all the way through the flight
profile.
>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.
Dry mass spec is 20 kg max. Propellant spec is 20 liters of 85%. So
if we hit the spec, our mass fraction will be 58%. So that 1.5 at
takeoff becomes 2.6 at landing...yep, deep throttling it is.
-R
--
"When I want your opinion, I'll issue you one."
-- Clay C. Chaffee, SSgt USMC
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