Kurt,

I'm not skipping anything. He's not trying to calculate the CG; the designer already did that. He wants to know where on the wing he should go to measure back 5 1/4 inches. The fact that the MAC plays an important role in calculating the CG does not tell us that the person who wrote these garbled instructions was trying to tell him to measure the 5 1/4 inches there. Have you ever seen plans or instructions that told you to do that measurement at the point where the wing width equals the MAC? I haven't.