MSVRatio:

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   Compute the velocity ratio for a multi-stage rocket.

   Call this function with no inputs and no outputs to show a plot of the
   velocity ratio as a function of payload ratio for different numbers of
   stages.

   The equations used to compute the velocity ratio neglect the effects of
   gravity and drag.

   Since version 1.0
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   Form:
   vRatio = MSVRatio( sR, pR, nStages )
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   ------
   Inputs
   ------
   sR           (1,1)  Ratio of stage dry mass to stage wet mass
   pR           (1,M)  Ratio of total mass above the stage to total mass
                       of the stage
   nStages      (1,N)  Number of stages

   -------
   Outputs
   -------
   vRatio       (M,N)  Ratio of burnout velocity to exhaust velocity.

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   See also: M2EP
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   References:   Wiesel, W. E., Spaceflight Dynamics, 2nd Ed. McGraw-Hill, 
                 1995, p. 201.
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Children:

Common: Graphics/NewFig