Discussion
Assertion (A): The aerodynamic centre of a wing moves aft as it accelerates through the transonic range.
Reason (R): Supersonic chordwise loading is much more uniform than subsonic loading.
Select the correct answer from the options below.
Answer: A
Both statements are true and the second accounts for the first. Subsonic loading is concentrated forward, placing the centre near the quarter chord, while supersonic loading is spread along the chord and places it near mid-chord. The resulting trim change is large and must be managed, as Concorde did by moving fuel.
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