My mainsail has a luff length (full tensioned) of 8.00 mtr and an area of 14.80 sq. mtr. With this I have an aspect ratio of 4.31 and a foot length of 2.10 mtr. The length of my squaretop is 580 mm.

My mainsail was made in 2003 and it reflects the standard then. Currrently the squaretops have grown to about 800 - 850 mm in length and the max allowed F16 area is now 15 sq. mtr with a max luff length of 8.10 mtr. I estimate the foot lengths to now be just over 2.0 mtr, as in 2.05 and such. This leads to an aspect ratio of 4.37.

Pretty much F16 mainsails have aspect ratio's between 4.25 and 4.40 depending on how the individual sailmakers cut their sails.

I hope this helps.

Wouter