On Thu, 1 Aug 2002, Randall Clague wrote:
> ...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...
I don't recall a failure like that, actually... Both Pegasus and Taurus
do roll control (in the case of Pegasus, after first-stage separation,
first-stage roll control being aerodynamic) using cold-gas thrusters in
the avionics package, and always have.
I wonder if you are thinking of the early engine cutoff of the second
Ariane 5 flight, which was caused by a spiral tube pattern in the nozzle
extension, whose roll torque was badly underestimated and overwhelmed
the roll thrusters.
Henry Spencer
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