Gents,
thanks for the info and calculations (if they were done as a result of my prodding!).
Based on Kris' measurements, a crude MAC is 13.51". Here's how:
Root chord, R = 428 mm = 16.85"
Tip chord, T = 258 mm = 10.16"
Mean double chord, C = R+T = 27.01"
MAC = 0.5C = 13.51"
At an effective span of 78.5" (removing a total of 2.5" for the wing tips) we have a half span (panel, P) of 39.25". Now watch this if you haven't seen it before:
Wing area = C*P = 27.01*39.25 = 1060 sq in.
Bo, what was your polygon measurement? Right - 1061 sq in...
David.