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  • 320375

    Looking through feedback this question has reared its ugly head!! Can someone give an insight to this ...

    Now, I understand for a piston engine the holding speed is VMP which in this answer is 95kts ... However, from my notes I have the following....

    VX Piston = VMP
    VY Piston = Between VMP and VMD

    If this answer is saying that VMP is the best rate of climb speed then it means that this speed is also the best angle of climb?! Surely one speed cannot give you both best rate and best angle?!

    So either this question has two correct answers or one 'more correct' than the other, in either way should this not be appealed with the CAA as being misleading?

  • #2
    Your notes should state:
    Vx piston about 1.1Vs
    Vy piston is between Vmp and Vmd
    However the examiner considers Vy to be nearer to Vmp. Hence the answer to the question.
    If we transfer Vmp onto the drag curve it is very close to 1.1Vs.
    But we can say that Vx is always less than Vy.
    On the practical side my PA28 Vx is 65 kts and Vy is 78 kts.

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    • #3
      Originally posted by colin View Post
      Your notes should state:
      Vx piston about 1.1Vs
      Vy piston is between Vmp and Vmd
      However the examiner considers Vy to be nearer to Vmp. Hence the answer to the question.
      If we transfer Vmp onto the drag curve it is very close to 1.1Vs.
      But we can say that Vx is always less than Vy.
      On the practical side my PA28 Vx is 65 kts and Vy is 78 kts.
      Thanks Colin, I shall amend my notes accordingly

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