FCS SF-4 Stretch Surfboard Tri-Quad 5 Fin Set< p>FCS fin systems have been working in collaboration with the world's most established surfers and shapers like Stretch Riddle to refine and produce an incredibly diverse and dynamic quad/ quattro fin system. This five fin set features an extra center fin that can be paired with the two front fins in a combo thruster set up, and represents great value for an entry level quad set up. Designed by Riedel for a wide variety of surfers and conditions, this fin features a moderate inside foil along a wide base, which generates significant speed from the initial turn, and a neutral foil along a thin, flat tip. Based on Glass Flex material, and features an inside foil very similar to the M-series fins. At increased speeds, applied force will allow the thin tip to twist with the flow becoming neutral while reducing lift and drag through turns. At low speeds, the ample surface area in the tip provides power, giving you the ability to generate speed with ease. Stretch's cambered foils were developed using a NACA foil in combination with theories taken from sailboard sails. At increased speeds, applied force will allow the thin tip to twist with the flow becoming neutral while reducing lift and drag through turns. At low speeds, the ample surface area in the tip provides power, giving you the ability to generate speed with ease. The result is a board that is free yet stable in high-speed turns. SF4 Tri Quad fins in your board and you'll fly down the line! The "stretch" fins are designed for that specific reason a fuller body and a flatter tip allow you to gain speed with ease! Front: Base: 4.48in. Depth: 4.48in. Area: 15.15sq.in. Rear: Base: 3.88in. Depth: 3.8in. Area: 11.22sq.in.
