VTToVB:

Path: AC/ACCoord

% Compute body velocity from alpha, beta and vT.
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   Form:
   vB = VTToVB( vT, alpha, beta )
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   ------
   Inputs
   ------
   vT          (1,1) Velocity
   alpha       (1,1) Angle of attack (rad)
   beta        (1,1) Sideslip angle (rad)

   -------
   Outputs
   -------
   vB          (3,1) Velocity in the body frame

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   Reference: Stevens, B.L., Lewis, F.L. , Aircraft Control and 
              Simulation, John Wiley & Sons, 1992, p. 64.
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