I saw your post and was wondering how I can determine the area of a typical wing tip from an already built model, without any plans to look at. This is what I think might work, tell me if it is close enough or am I missing something.
I streach a string around the wing tip from the tip wing rib at the leading edge around to the same rib at the trailing edge of the wing. lets call this distance 12 inches. then I measure the chord of the wing lets say 9 inches. On a piece of paper I draw a line 9 inches long to represent the wing chord. Then I attach my 12 inch string to the ends of the 9 inch line and streach it out so I form a right triangle. I can then measure the unknown side and compute the area of the triangle thus solving for the wing tip area.
Will this work?
Sparky