However, to check the CG, I
still have to take these calculated values and place them onto the
diagram called "Center of Gravity Moment Envelope". Does anyone know
if this lookup can be performed via a calculation?


You can describe the envelope as a series of lines; your point will be on one
side or the other of each of those lines. So, apply a test ( p1 +? ax+b ) for
each of those lines, and if it passes all the tests, it's in the envelope.

Jose

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