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Nacelle placement on a transonic transport matters aerodynamically because

  • A.The nacelle determines the critical Mach number of the fin
  • B.It adds area and can interfere with the wing shock
  • C.The nacelle changes the wing's aspect ratio
  • D.The nacelle carries most of the wing's lift

Answer: B

A nacelle adds cross-sectional area over its length and its own flow field interacts with the wing's supersonic pocket. Placed carelessly it strengthens the shock and provokes separation; placed well it can be nearly neutral, which is why nacelle position is settled early and changed reluctantly.

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