ORIGINAL: doxilia
Simply calculated without getting the proper MAC of the wing:
Crude MAC = 14.83 + 9.76 = 24.59''/2 = 12.295''
Wing Area = MAC x Span = 12.295'' x 63'' = 774 sq in
Naturally this includes the tips and I've overshot the MAC so 24 squares are lost to give 750 squares.
David