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viatormundi said..DavidJohn, for JL Rail 28" wide which size of these FCS Connect fins would you recommend?
I have at home also an SIC fin, more straight. I think it is called the Spitfire design. What is the major difference between that and a dolphin shape fin!
The SIC fin looks like this

I'd recomend the 9".. but you might need to check that it fits your JL board (it should).. and you shouldn't be concerned in the least about the click in feature.. I trust it 100%..
You will not notice a big difference between the dolphin shape and the spitfire shape at low speeds except when it touches in shallow water.. The spitfire shape will catch and grab rather than slide and drag without catching like the dolphin shape can..
At higher speeds in particular planing speeds is where you will notice the biggest differences.. When surfing a wave or runner and you're turning left and you keep the board flat to lessen the drag of digging a rail you will feel the fin creating lift and making the board lift its upwind rail and want to turn left.. and once the upwind rail starts to lift the amount of lift from the fin increases making the turning effect worse.. This lift effect is great for windsurfers that want to go upwind but just like windsurfers if you want to go downwind or surf a wave you don't use a spitfire shape fin.. You use a more dolphin shape fin..
IMO a good DW fin is one that offeres good tracking (but not too much) and good stability (but not too much) and needs to have enough have enough curve in the tip to drag when it touches and enough rake to not catch weed.. but not too much because too much rake makes the board hard to turn..
Spitfire fins work well on long unlimited DW boards because the fin doesn't need to help with stability or tracking because these big boards have already have good tracking and stability but the one thing these boards don't do well is turn.. The spitfire shape helps big boards turn but imo they don't work well on 12'6" and 14' boards unless you have no interest in surfing or DW..
I like a fin that feels very neutral so you don't know it's even there.. It just works.. and you should try and use as small a fin that you can get away with to reduce the drag..