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Old 26th Jan 2012, 15:25   #47 (permalink)
keith williams
 
Join Date: Jan 2011
Location: England
Posts: 653
You need to understand the meanings of the various terms.

The MAC is the Mean Aerodynamic Chord Length.

The statement that
Quote:
the MAC is given as 134.5 inches
means the distance from the MAC leading edge to the MAC trailing edge is 134.5 inches.

15% of 134.5 inches is 20.175 inches.

So if the CG is at 15% MAC it is 20.175 inches aft of the MAC leading edge.

If we now add the MAC leading edge poistion of 625.6 inches aft of datum we get a CG position of 20.175 + 625.6 = 645.775 inches aft of datum.
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