🚀 go-pugleaf

In article <92322.152812AUJAM@ASUACAD.BITNET> <AUJAM@ASUACAD.BITNET> writes:
>... didn't they design the engins to
> burn at throttle up 110% to push past a certant point in the launch trajectory
>and this is only for a few second,kind of like red lining your car...

This sounds like a confused combination of two things.

One is that in some kinds of engine-failure emergencies, the remaining
engines get pushed to 109% (the highest the engines are currently cleared
for) to make up for the loss.

The other is that during a short period early in flight, as the shuttle
is approaching maximum dynamic pressure ("max q" -- when air drag is
at its peak, because the shuttle has accelerated to a fairly high speed
but isn't yet clear of the thick lower atmosphere), the engines are
throttled *down* briefly.  This holds down speed a little until the
shuttle is in somewhat thinner air, reducing the peak pressure and
the associated stresses and heating.
-- 
MS-DOS is the OS/360 of the 1980s.      | Henry Spencer @ U of Toronto Zoology
              -Hal W. Hardenbergh (1985)|  henry@zoo.toronto.edu  utzoo!henry