WindMdl:

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   Wind model with constant velocity and angle.
   Use as a replacement for the variable wind model.
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   Form:
   [VWind, AngWind] = WindMdl
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   ------
   Inputs
   ------
   t                  (1,1) Not used

   -------
   Outputs
   -------
   VWind              (1,1) Wind velocity
   AngWind            (1,1) Wind angle

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