Dont want to be a cynic here but F10 ??? Perhaps I`m a bit of a wimp but 55 to 65 MPH is totally unsailable for me.Once got caught out in a yacht in a F10 the sea looked like snow and had spindrift to a depth of at least a foot !(You can drown in the spray in a F10)
A 3.5 works for me in 35 knots (easily)A f10 is about 50 knots.50 knots contains just about double the energy of 35.
By that reckoning I`d need a 1.75 sail.Reckon my body is about that !!!
Any piks of these F10 days ???
Theres windy and there is F10 .If its F10 stay at home.