NACABladeMOI:

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   Approximates the mass moment of inertia about a point on the blade
   cross-section for symmetrical NACA blades.
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   Form:
   MOI = NACABladeMOI(d)
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   Inputs
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   d          (1,1)  Data structure
                     .t          (1,1)  Thickness Ratio
                     .c          (1,1)  Chord length (m)
                     .x0         (1,1)  X Coordinate of Rotation Axis (m)
                     .y0         (1,1)  Y Coordinate of Rotation Axis (m)
                     .M          (1,1)  Mass (kg)
                     .dx         (1,1)  Resolution (m)

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   Outputs
   -------
   MOI        (1,1)  Moment of Inertia (kg*m^2)

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   Reference: 

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