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In order to find the percent MAC, firs determine the distance of the CG from LEMAC. 

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The location of the CG expressed in percent MAC is 

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determined using the formula found in Figure 3-18 . The CG of the airplane is located at 27.4 percent MAC. 

It is sometimes necessary to determine the location of the CG in inches from the datum when its location in percent MAC is known. 

The CG of the airplane is located at 27.4 percent MAC. 

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Determine the location of the CG in inches from the datum by using the formula found in Figure 3-19 . 

The CG of this airplane is located at station 160.9 inches aft of the datum. It is important for longitudinal stability that the CG be located ahead of the center of lift of a wing. Since the center of lift is expressed as percent MAC, the location of the CG is expressed in the same terms. 

