Hi fellow sailors. i have built a class 5 YOTT and have been using a used land yacht sail i was lucky enough to find on the internet that I was told is a 5 meter sail. The sail is not labeled anywhere like a windsurf sail with the square meter size or luff size so im taking the sellers word that it is a 5 meter. i have compared it to some BLO KART 4 meter sails and it is slightly larger and seems about right to be a 5 meter. So here is my question, We have had several very light wind days sailing here and with the wieght of my YOTT and my wieght i need a larger sail for days like this. I know class 5 rules restict the sail size to 5.5 m2 for racing but this is for recreation sailing on light wind days. HOW BIG A SAIL DO MANY OF YOU USE ON YOUR CLASS 5 YACHTS? i WAS THINKING OF MAKING A SAIL AROUND 7.0 -7.5 METERS. Do any of you use sails that big

And should it be the same at the top as the bottom Mast pockets is what I'm talking about. When I knocked together the sail for 'Test Bed' I just took the max spec size from the Class 5 regs which I think was 140mm flat. I've just spotted an article explaining windsurf downhaul about the bottom of the sail being the 'engine' and the top the 'exhaust'. And that the bottom needs the battens close to the mast to get the correct shape but away from the mast at the top. Is this correct? Should I tighten the pocket to be close to the mast (not too tight to stop easy movement) then run the stitching straight along the pocket or should I follow the mast's taper Thoughts from the experts please, as currently the sail is like an on off switch, literally nothing happens till the wind picks up then it's off like a rocket

Cheers Col