OffsetPC:

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   Offset Pitch Control Algorithm

   This "control" algorithm maintains a constant pitch angle, which in
   general is not equal to zero. The pitch angle offset can be specified
   in the file.

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   Form:
   PitchInc = OffsetPC( theta, alpha1, offset )
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   ------
   Inputs
   ------
   
   theta            (1,1)     Rotor angle (rad) [NOT USED]
   alpha1           (1,1)     Zero-pitch angle of attack [NOT USED]
   offset           (1,1)     Desired offset angle

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   Outputs
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   PitchInc        (1,1)      Pitch angle control increment (rad)

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