Surfboard fin
Fins can provide lateral lift opposed to the water and stabilize the board's trajectory, allowing the surfer to control direction by varying their side-to-side weight distribution.A common problem with these early boards was "sliding ass", in which the tail would slip sideways, usually causing a wipeout.[1][2] Around 1936, Woody Brown independently added a fixed fin to his second surfboard design in San Diego, which further popularized the feature.[1] In surfing, there are two major types of (typically stationary) surfboard fins (hydrofoils), and a host of illustrative issues.A "skeg" (an upright, streamlined, often raked keel) typically denotes one centrally-mounted stabilizer foil mounted perpendicularly to the riding surface, at the rear of the surfboard.Rail fins also add lift (known as "drive") in trim and with greater holding ability, enable steeper wave faces to be ridden and higher speed "down the line."Most surfboards intended for larger waves are longer (to increase hull speed for paddling, wave-catching, and surfing), and as most shapers orient the rail fins toward the nose of the board, a longer board inherently results in reduced toe-in of rail fins, therefore less negative angle of attack, less oscillation, greater stability, and higher speeds.This is a significant additional factor in lift at various attitudes, drag, and performance, as are the variables of other foils – including flexibility, thickness, and planform.The center fin merit of being able to adjust its suction face and its angle with the direction of the turn to avoid the hydrodynamic stall.In Windsurfing, a derivative of traditional surfing, skegs are also often used as a central stabilizing fin (hydrofoil) located at the rear of the board.The skeg has undergone numerous phases of development and, as with other foils, its design is determined by the balance of the pressures it experiences in use, including lift, drag (physics), ventilation and stall (flight).It was not until the 1980s that Simon Anderson invented the popular thruster set-up (three fins – two on the rail 25–30 cm (10–12 in) from the tail end, one center fin 8–12 cm (3–5 in) up from the tail) which stabilized the board compared to the twin-fin set-up, and provided more control and lifting surfaces in an effective configuration.It had a narrower tail than the twin-fin designs that preceded it; this feature gave the Twinzer more speed without losing maneuverability.The Bonzer array is firmly held to be an integral part of the Campbell brothers' overall board design featuring double concave bottom contours out the tail.The central line configuration comes from optimizations of Dynamic system "ADAC",[5] conducted in France by jf Iglesias, and applied to surf since 2014 with the brand Fyn.The configuration on the center line thus increases the force of the rail support, to benefit from the effects of leading edge flaps and adjust the positions of the gaps between the fins (if rear spoiler is mounted USbox) .The configuration on the center line of the dynamic fin has maneuverability and drive the system ADAC and also the effectiveness of the rail support of the central position that was formerly reserved only for singles.When the surfer is turning at high speeds, the turbulent boundary layer helps the flow overcome an adverse pressure gradient and allows the fin to remain attached to the surface longer than it would otherwise.Designed by Australian Surfer/inventor Courtney Potter while working closely with Josh Kerr, Jamie O'Brien and Christian Fletcher and a comprehensive series of Fluid Dynamic testing.This is what propels the board, the smaller rake fins will offer greater speed and will be more predictable but less ideal for short, fast turns.Large rake fins offer you a "squirrelly" yet playful experience whilst letting you make tighter turns.
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