There is simple reason that is easy to understand why Speeedfins create more speed, more drive, project off the bottom turn and help to eliminate stop start surfing.
It’s called “Attached laminar flow”.
Q. What is “Attached laminar flow” (ALF).
A. Attached laminar flow (ALF) is the water flowing down each side of the fin foil.
Q What if the Attached Laminar flow is stopped or disrupted.
A. If the Attached laminar flow is interrupted while turning this creates turbulence or cavitation on one side of the fin which slows the surfboard as this is drag.
Q. Which side of the fin?
A. The low pressure side or in other words the side that the water is not being pressed against.
 Q. Why then are Speeedfins foils better than every other foil system?
A. Speeedfins foils are active. This means the rear half of the fin at the base moves sideways slightly as the water pressure builds. The harder you turn the more they move.
Q. How much do they move?
A. Not much. Depending on the fin material used. For example our REO model will move left to right around 7mm whereas our Ceramic & Carbon models will move 4-5mm.
Q. Why does this movement make Speeedfins faster?
A. As the fin responds to the water pressure the base of the fin has changed shape slightly helping to allow the water to stay attached. To put it simply, the base of the fin goes from being straight to looking like a banana if you are looking down at the fin.
In summary, Speeedfins active trailing edge helps to keep the water attached whereas glass-on fins and all other current removable fin systems in effect have fixed based created cavitation and drag as the surfboard goes through the turn
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