07-February-2005, 06:52 PM
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Established Member
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Join Date: May 2003
Location: Rochester, NY
Posts: 1,135
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From the Space Shuttle Reference Manual
Quote:
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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.
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