UFromAlphaBeta:

Path: AC/ACCoord

% Compute wind vector from angle of attack and sideslip.
 This is the velocity vector. When alpha is zero the velocity vector
 is along +x. When it is 90 it is along +z.
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   Form:
   u = UFromAlphaBeta( alpha, beta )
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   ------
   Inputs
   ------
   alpha       (1,:) Angle of attack (rad)
   beta        (1,:) Sideslip angle (rad)

   -------
   Outputs
   -------
   u           (3,:) Body vector

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   Reference: MAE142_Lecture13.pdf
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