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Homework Help: Aerodynamic power

  1. Jan 21, 2012 #1
    1. The problem statement, all variables and given/known data
    aerodynamics question. Power P to fly a plane.
    Has P = Mass 3/2 do not know if this means square M by 3/2? that is how i take it to be then you divide this by √S which is cross section of wing.

    figures are M = 124.6kg 3/2 divided by S = √ 36m Squared
    solution comes up with M 1389/S 6m = 231.5kg m to power of -1
    I do not know how to get to figure of 1389?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jan 21, 2012 #2


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    Staff: Mentor

    (124.6)(3/2) ≈ 1391

    If the author used logs with only a few decimal places, or a slide rule, to work out the answer it could have ended up as 1389. Is this example from a book? If so, what's the date of publication?
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