Wouter

Does a sail with a 1mm head and the same area as a sail with a 1000 mm head have the same aspect ratio?

NOT using the SCHRS model as we use a simple method to make measurement easy.

I am quite aware of how SCHRS does it!

Are you suggesting that a sail that is a rectangle is has the same aspect ratio as a triangle of the same luff length and area?

If yes (and I have the feeling you will say yes). Then why do people refer to sails with larger heads "higher aspect?".