futura 111 and sail out of range
 

is it possible to use with a futura 111 (2011 range sail 5mt-8mt) a sail 8,5mt with 3 camber?
i'm 69 kg
two fins 42 and 44

Absolutely!
You won't get the full early planing benefits from the 8.5 sail, and you won't get planing quite
as early as you would on a bit wider board, but it will certainly work for recreational sailing.
Should be good from around 12 knots up to maybe 15 knots, then look for a smaller sail
around 7.0-7.5 m2.'
Roger

Hav'nt tried a 8.4 but just got a 7.8 Loft Switchblade and on my F111 with the stock Venom 42 it handles it easily and trucks upwind, I weigh about 75kg. Very nice : )