I am delving into an area where I have no expertise, but it seems like you could take photo of an unrigged sail from above, laying flat in a specific sized space (say a 6 meter square box or smaller for smaller sails) outlined with a line.
With the photo and some computer software, it seems like one could come up with a program that would instantly give you the "sail occupied" space inside the box, thus providing the exact size of the sail.
This way, everyone making sails and using the same software would be able to measure sail size consistently and accurately. A universal process, isn't that refreshing.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.