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Dog-faced pony soldier
Join Date: Feb 2004
Location: A Rock Surrounded by a Whole lot of Water
Posts: 34,187
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Not an expert on the 747, but I'll propose the following for thought: The downward-deflected control surface is deflected downwards to increase camber (and lift) on the left wing, trimming for wings-level versus a left-wing-low condition in an untrimmed condition. The upward-deflected surface (spoiler) is deflected upwards in lieu of rudder trim to trim YAW - i.e. dragging the left wing back and trimming against a nose-right untrimmed condition.
Possible? Dunno.
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Black Cars Matter
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