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Haircut said..i had a very brief go (rodeo ride), and i can see the attraction and challenge
i was surprised by the large sized sail apparently needed for overall ease of use.
has anyone successfully mastered using a foil on a rig like a 4.5m in 12knots-ish winds? That would be a real move forward imho

what sized sail / wind strength is used in your photos Sean?
Personally I think videos like the Naish one where Robby is cruising on a 4.7 in '8kts' of wind are taking the p$. There is a limit even given a super high lift foil like the naish in what you can take off in. At my weight (68kg) with a 5.2 wave sail and a very good pumping technique it's about 12kts on a Pryde F4 with the race wing, which is a super efficient foil; with my 7.8 it's 7-8kts...can keep foiling down to 6kts once going.
Lift increases with the square of windspeed so 10kts is a lot more that 6kts in terms of the power your sail can generate and there is simply no way of getting around it even with the highest lift foil in the world.
The other thing to consider is with a 5.2 in 12kts, yeah you can cruise around but if you are into course racing you are going to have a bad day. You need power to sail good angles, particularly in the lighter winds. Take Sunday at the foil nationals just gone, Sunday was solid 25kts with higher gusts, most of the fleet was on a 7.0 or 7.8.