Why does the shuttle throttle on ascent?

"Tim Rogers" wrote in message ...
:
: "Blueskies" wrote in message
: . net...
:
: "Danny Deger" wrote in message
: ...
: :
: : "Danny Deger" wrote in message
: : ...
: :
: : Why does the shuttle throttle to 3 Gs on ascent?
: :
: :
: : The 3 G throttling is done late in the flight (about 7:30)and has
: nothing to
: : do with dynamic pressure. It was designed in to allow "regular" people
: fly
: : the shuttle.
: :
: :
:
: Yes, the aerodynamic loads are highest early in the flight so the engines
: are throttled then back up. The shuttle rolls
: over on its back to fake the occupants into feeling 3 gs when in fact the
: vehicle is pushing 4 gs....
:
: No.
: The 3 Gs is at the backs of the occupants (and along that same axis for the
: vehicle.) This is the same if they are heads up or heads down.
: If you lie with your back on the floor, you feel the same 1 G if your head
: is facing north or south.
:
: Tim
:
:

Not talking about facing north or south, they're talking about hanging from your feet or standing upright...