Quite useful to join the model aircraft ranks to sort out MAC!! If you build a swept wing model, the MAC is needed as reference for a standard C.G at about 25% MAC.
How's it done? - simple ... draw a scale plan view of one wing; reverse the view and attach it to the first one such that the trailing edges coincide; draw lines joining the four 'corners'; where these lines cross is the MAC point on each wing. On one (or both) wing plan(s) draw a chord line at this (these) point(s). Mark a point at, say, 25% of that chord line on each wing and join them. For easy handling CofG purposes, the aircraft should balance longitudinally when suspended at that point. Simple, innit?
Then all you have to do is learn to fly radio!!!
