Discussion
The aerodynamic centre of a thin aerofoil in supersonic flow lies close to
Answer: D
Supersonic loading is far more uniform along the chord than subsonic loading, so the resultant acts near the middle rather than at the quarter chord. The rearward shift of the aerodynamic centre as an aircraft accelerates through Mach one is a major trim and stability problem, and Concorde pumped fuel between tanks to deal with it.
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