Guys, just for my own edification, I drew the wing half-span of my Great Planes PT-19 and found the centroid and the MAC. The initial balance point, 4-15/16" from LE @ the fuse calculates to be 32% of the MAC, and the fore and aft CG range, 4-1/8" & 5-7/16" calculate to be 25% to 36% of the MAC. How do you determine what % of the MAC is the correct range on an airframe, whether it is a warbird or aerobat? 36% MAC sounds like an accident waiting to happen! Thanks for your help.