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high as a kite said..
How do you measure the size of a wing.
Is it as easy as measuring around the outside edge?
To measure the flat area, divide the wing into a series of rectangles from front to back. If it's a kite usually the panels give you a good enough set of rectangles to work with. For a foil, put some tape on it and mark a line every few cm. You only need to do it for half the wing.
Measure the width and the depth at the middle of the rectangle. That compensates for the angle or irregularities of the trailing or leading edge. It also works for triangular tips.
Calculate the area of each rectangle. Depth x Width.
Add them up and double it (because you only measured half the wing).
You can't measure the projected area but you can estimate it. Most kites are around 60% of the flat area.
PS My go to foil for all kinds of fun is the J Shapes Cruzer. Great in the waves or slashing around on flat water.