RocketDrag:

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   Compute the drag on a rocket using a plate model or Jones/Sears/Haack. 

   Uses a scale height atmosphere for the Earth above 80 km, otherwise
   StdAtm for the Earth or exponential atmosphere (AtmDens1) for other
   planets. If only r and v magnitudes are input, the drag magnitude is
   returned.

   The standard atmosphere data is stored in a persistent variable.

   Since version 2015.1
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   ------
   Inputs
   ------
   r        (3,:)      Position (km)
   v        (3,:)      Velocity (km/s)
   d         (.)       Data structure
                       .cDA   (1,:) Coefficient times area for plate model
                       .drag   (.)  Data for LiftAndDragJonesSearsHaack
                       .planet (:)  For planets other than Earth
   j        (1,1)      Stage index, if needed

   -------
   Outputs
   -------
   drag     (3,:)      Drag force (kN)
   rho      (1,:)      Atmospheric density (kg/m3)

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   See also AtmDens1, AtmDens2, StdAtm, LiftAndDragJonesSearsHaack
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Children:

ACPro: ACProAerodynamics/LiftAndDragJonesSearsHaack
AeroUtils: AtmosphericCalculations/AtmDens1
AeroUtils: AtmosphericCalculations/AtmDens2
Common: Atmosphere/StdAtm
Math: Linear/Mag