FThrustLander:

% Returns thrust and exhaust velocity for a rocket engine.

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   Form:
   [thrust, uE] = FThrustLander( massFuel, d )
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   Inputs
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   massFuel (1,1) Mass of fuel (kg)
   d        (.)   Data structure
                  .thrust  (1,1) Thrust magnitude (N)
                  .uE      (1,1) Exhaust velocity (m/s)
                  .uThrust (3,1) Thrust unit vector

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   Outputs
   -------
   thrust	(3,1)	Thrust vector (N)
   uE      (1,1) Exhaust velocity (m/s)

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