Wave fins are small curved fins with excellent manoeuvre properties. As wave boards are also very small they are extremely sensitive and need the right size and type of fin. If the fin is too big and its tip too hard, controlling the board will become worse and manoeuvrability will suffer. If the fin is too soft or too small its performance will also be reduced drastically.
Under on-shore conditions, slightly larger and stiffer fins are being used maybe with less curvature. The fin profile may be slightly fuller and the nose rather blunt to achieve more lift.
Under side-shore conditions, control and speed are of maximum importance. The fins are slightly smaller, have more curvature and a flatter profile.
A good wave fin should give the sailor a good control of the board and support his/her manoeuvres. After a radical manoeuvre, the flow will break down and a new stable flow pattern has to be built up as fast as possible. A slightly fuller profile, a blunt nose, maximum thickness closer to the nose, and a rather soft tip will meet these demands.
Most of the wave fins are made of G 10. This type of material makes them robust and provides them with good flex-twist properties. Their draft mostly ranges between 17 and 25 cm.