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Waiting4wind said..
Naish reccommends small sails for their foilboards, I think 4.7 to 5.7, while guys on other brands are using large sails, eg, pride, starboard.
is the sail size a function of the foil design? Will the naish not cope with larger sails 6-7m. I would have thought to maximise light wind planing a bigger sail is needed?
As the others have said there is quite a different philosophy going on between the brands. Naish is purely in the 'get going as early as possible and have as much fun' camp. I tried all the Naish foils up at the WSS demo day and they get going super early and are very easy to use, this is their ballpark. I reckon if all you want to do is foil for fun and have a blast in super light wind with smaller sails you can't beat the Naish, you will not win races.
Pryde and Starboard on the other hand seem to be aiming at more of the race end of the market. I have the RS:Flight F4 and it is a very very fast foil. With the two wings you have everything covered from course racing to high speed slalom. However, cruising around in <10kts is not that easy or comfortable even with big sails and someone on a Naish will most likely foil right past you with a wave sail while you're slogging/pumping and have way more fun. Once it's 12+kts though and if you're interested in racing you'll destroy a Naish around a course.
The NP RS:Flight AL is a bit of a weird one I reckon. It has quite a small wing (a fair bit smaller than the F4's big wing) which means that it needs a fair bit of wind to get going. I reckon I'd need a 7.0m and min 12-14kts+ to get going on it comfortably, where I can cruise on the F4 in 10-12kts on a 6.0m (less wind once you're on the foil).
They also have the RS:One Convertible, which has the same mast, fuse and stabiliser as the Flight:AL but it has a bigger front wing as it's designed for course racing. This gets going quite a bit earlier, similar to the F4 with the big wing. I'm not sure why the didn't sell the Flight:AL with the bigger wing or have it as an option as it seems more in line with what people want to do with a foil; Marketing I guess.
So end of the day pick wisely, all foils' are not alike. I think most people getting into foiling and just wanting to get out in light winds and cruise around/learn the ropes would be better served on the Naish foils. If you're into course racing or more speed, the NP or starboard foils offer more performance once you're over that super light wind threshold but that's not without drawbacks like bigger sails/race sails etc.