DragUndercarriage:

Path: ACPro/ACPerformance

% Computes drag coefficient increment due to the undercarriage.

   Type  DragUndercarriage for a demo.
   Since version 5.
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   Form:
   deltaCD = DragUndercarriage( m, s, f )
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   Inputs
   ------
   m              (1,1)  Mass (m)
   s              (1,1)  Reference area (m^2)
   f              (1,1)  If entered the flaps are down

   -------
   Outputs
   -------
   deltaCD        (1,1)  Change in drag coefficient

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   Reference: Mair, W. A. and D. L. Birdsall, "Aircraft Performance,"
              Cambridge, p. 124.
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