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  • Q810403

    Which of these statements about stall speed is correct?

    (A) Increasing forward sweep decreases stall speed

    (B) Increasing forward sweep increases stall speed

    (C) Decreasing wing anhedral decreases stall speed

    (D) Increasing wing anhedral decreases stall speed

    Correct answer marked as B.

    I agree that an increase in wing sweepback will increase the stall speed. However, answer B clearly states "Increasing forward sweep"; that is, sweeping the wings forward.

    If one pictures an aircraft with swept back wings, then surely forward sweep would bring them back closer to being straight wings, and hence decrease the stall speed once again.

    The only way I can see B being correct is if the wings are swept forward from an already straight position. However, this isn't specified, and a similar question ( does work under the assumption that the wings are already swept back.

  • #2
    Many Tornado or F111 pilots might agree with your interpretation. But note that swing wing variable geometry aircraft are not included in EASA learning objectives.
    Like many PoF exam questions, this one seems to be written from the perspective of a designer. He has the simple choice of giving his aircraft straight wings, wings with sweepback, or wings with forward sweep.
    Have a look at the Grumman X29 or the HFB 320 in google images. They illustrate what is meant by forward sweep in the exam.
    Straight wings have the lowest stalling speed. Changing the design by sweeping those wings either forward or back will increase stalling speed, and the more they are swept, in either direction, the greater the increase.


    • #3
      Alrighty Ben, thanks for the clarification!