i also am 100 kilos
on my older longboard my biggest sail was 7.0
i never tried a RIO, but i imagine it can rock/plane well
once on a bigger short board for my weight in lighter winds i went with an 8.5 non-cambered sail - this was the biggest no cam sail from my preferred sail company MS - there are others that make a 9.0 no cam like SW retro.
i have even tried an 11.0, but that is heavy
8.5 is great in 20-40 kph winds and i am actually buying a 10.0
people use this up to 20 knots on formula boards
it is NOT like 15 years ago
so, depends on your budget and strength
tough guy with patience - go for 8.5 to 9.0 (cam or no cam is your choice)
really out of practice and less patience - want to lend it, etc - go for 7.0 or 7.5
joe windsurfer @ 100 kg
2006 AHD type-F FF 160/79cm, 2002 BIC Techno Formula, 2000 Fanatic BEE 124 LTD + Mistral Equipe I LCS
HSM Fire 6.3, Gaastra Flow 3x 7.0, TR-6 8.4, TR4 10.0
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Last edited by joe_windsurfer; 20th February 2010 at 10:25 AM.