Wouter...
You wrote "The specs thus far are :

Weight ready to sail : 60 kg (132 lbs)
Length : 3.70 mtr (12 feet 2 inches)
width : 1.85 mtr (6 feet 1 inch)
mast height : 6.000 mtr (19 feet 8 inches)
mainsail luff length : 5.500 mtr (18 feet)
mainsail area : 7.00 sq. mtr. (75.3 sq. ft.)
boom length 2.000 mtr (6 feet 6 inches)"

What is the designed crew weight for this particular boat?
Please excuse me if you have already answered this in a earlier post...the F12 topic has gone through so many incarnations that its hard to keep track of what went with what...

Thanks,
Bob