Of all the boards that I have tried, the ultimate light wind board ranking is
So my conclusion is the big kite needs a big fin to counter the force.
It is the size of the fin, not size of the board that matters.
I dont think so....
IMO the light wind ranking is typically:
Freerace board / Skimboard / SUP all about the same regarding light wind ability
Wide flatrockered surfboard
Surfboard / bigger Twintip
Finless Skimboard ??? I think it is more a question about conditions and how experienced you are, as fins or no fins should make no difference at all, if you have good skills and smooth water.
I think you are talkning about round or elliptical "beach" skimboards without fins ?
Right, they are not that efficient.... But if you take, say a North Skimfish - then it will be able to go so early that you almost wont believe it !
I've tried these, and I've raced against these so to speak, in light wind with a freerace board.
So it is NOT all about fins IMO, but rockerline, volume, surface, edges - means much more than fin size regarding "light wind" ability.
Fin size is important regarding upwind angle and efficiency on raceboards, but apart from that not important IMO.
PS: Light wind ability and upwind performance are two very different things.... And NOT mentioned in above list.