StructuralMass:

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   Determine the mass available for airship structure and systems.
   The lifting gas is assumed to be Helium.
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   Form:
   [m0,mT,mH] = StructuralMass( VMax, kSV, rhoF, alt, mP );

   Example:
   [m0,mT,mH] = StructuralMass( 736310.778, 0.065, 0.5, 21300, 1814 );
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   ------
   Inputs
   ------
   VMax        (1)       Maximum volume                    [m^3]
   kSV         (1)       Surface area -to- volume ratio
   rhoF        (1)       Exterior fabric density           [kg/m^2]
   alt         (1)       Pressure altitude                 [m]
   mP          (1)       Payload mass                      [kg]

   -------
   Outputs
   -------
   m0          (1)       Mass available for structure and systems   [kg]
   mT          (1)       Total vehicle mass, including payload      [kg]
   mH          (1)       Mass of Helium                             [kg]

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Children:

Common: Atmosphere/StdAtm
Common: Graphics/NewFig