# Aerodynamic power

#### NegDee

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

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#### gneill

Mentor
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?
(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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