InertiaCubeSat:

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   Compute the inertia of a 1U, 2U or 3U CubeSat assuming the mass
   is uniformly distributed throught the volume. This is a good
   first cut. This uses the mass data structure which contains mass,
   inertia and center of mass.

   Type InertiaCubeSat for a demo.

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   Form:
   inertia = InertiaCubeSat( type, mass )
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   ------
   Inputs
   ------
   type   (1,2)     '1U' '2U' '3U'
   mass   (1,1)     Mass (kg)

   -------
   Outputs
   -------
   inertia (3,3)     Inertia matrix (kg-m^2)

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Children:

Common: CAD/Inertias