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Originally Posted by Hamlet
From the Space Shuttle Reference Manual
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The orbiter flies upside down during the ascent phase. This orientation, together with trajectory shaping, establishes a trim angle of attack that is favorable for aerodynamic loads during the region of high dynamic pressure, resulting in a net positive load factor, as well as providing the flight crew with use of the ground as a visual reference. By about 20 seconds after lift-off, the vehicle is at 180 degrees roll and 78 degrees pitch.
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It would seem aerodynamic loading and visual reference are the main reasons. |
CLICK! Angle of attack, that makes sense. Upside down, the aerodynamic load squeezes the Shuttle and boosters together, Right side up, the forces would try to pull them apart.
Thanks