QRHydrocarbon:

Path: Propulsion/Chemical

% The lower heating value for a hydrocarbon fuel.
   The fuel is CnHm.
   n can also be the name of a jet fuel: JP-3 through JP-8

   Since version 8.
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   Form:
   qR = QRHydrocarbon( n, m )
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   Inputs
   ------
   n            (1,1)     Number of carbon atoms or fuel name
   m            (1,1)     Number of hydrogen atoms

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   Outputs
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   qR           (1,1)     Lower heating value (J/kg)

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