Discussion
Assertion (A): The aerodynamic centre moves rearward as an aircraft accelerates through the transonic range.
Reason (R): Supersonic chordwise loading is far more uniform than subsonic loading.
Select the correct answer from the options below.
Answer: C
Both are true and the second explains the first. Subsonic loading is concentrated near the leading edge, placing the resultant at the quarter chord, whereas supersonic loading is spread along the chord and places it near mid-chord. The shift produces a large nose-down trim change, which Concorde managed by moving fuel.
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