damned67 said..
"That depends a lot on how you are surfing it ....." - like the rest of my boards, poorly.
I like the idea of playing with a 'thruster-like' set up, particularly as I read that many riders seem to use smaller than 'usual' fins in their gliders. Well, smaller than the usual 'inch of fin for foot of board' type approach.
However, if I don't like that set up, I'm stuck with fins I will likely never use again.
Looking at my fin rack, I do have an Island Fin Design "Leeward" (hatchet) that is either 9.5" or 10". Also have a Island Fin Design 10" Islander, which is similar to the 4A, and 10.5" Alkali/Thomas fin sitting there too.
If your surfing it as a glider less fin is your friend for sure and there's no need for sides as they will just create drag... The function of a thruster or three fin array is to assist with turning and stability when waves are bigger/steeper or you are turning more critically.
The islander 10" looks really nice but you could go 9" I reckon and the Thomas Bexton by Alkali is a cracker, I found it to be a really fast and smooth fin, I only swapped it for the Hatchet as it was more stable on the nose... But the hatchet is pretty much redundant unless your noseriding.
Thats my thinking anyways...