On Wed, 31 Jul 2002 14:30:15 -0400, Alex Fraser <[EMAIL PROTECTED]>
wrote:
> My arguments for multiple catpacs is for scaling reasons and for the
>ease of designing the chamber for mixing of other fuels. No one has
>commented on the off setting of the engines to cause a vortex to aid
>mixing.
Didn't someone object that vortex mixing would cause torque and
chuffing? Orbital had a torque problem a few years ago: they had no
roll control on one of their vehicles, never needed it. But when they
switched to a composite bell (nozzle? Henry will know), they lost the
bird. Turns out the composite was spiral wound, and that introduced a
tiny roll torque - enough, over the length of the burn, to overwhelm
the GNC. Which, because the vehicle had no roll control, the GNC
couldn't fix. Bye bye birdie...
-R
--
"Sutton is the beginning of wisdom -
but only the beginning."
-- Jeff Greason
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