King fins are handmade composite fins designed for slalom windsurfing. Since 2012, we have constantly improved the shape of the fins with the aim of making them fast in all conditions. Today we offer autoclave quality and race-ready fins that you can sail with confidence.
The current model is a fifth evolution called the E5; in this model we have changed the guidance curve to have a smaller tip area and increase the top speed.
In each fin there are up to 38 different layers of 6 types of fabric, cut to length to achieve a standard stiffness. We recommend the medium standard stiffness (M) for all-round performance, but we can also produce much softer (S or S-) and harder (H) versions on request. Rake angles are set at 3.5° for 48-50 cm, 4° for 42-47 cm fins and 4.5° for tuttle box fins from the trailing edge vertically.
Autoclave technology for composite materials is mainly used in the aerospace and marine industries, for high-performance parts in Formula 1, racing cars, etc. The autoclave is a heated pressure vessel that generates high pressure for the compression of the laminates. The result is high quality composite parts with the highest possible fibre volume content and almost zero porosity.
King fins are made from epoxy/carbon/glass fibre in two-piece moulds. We use autoclaves with programmed pressure-temperature-time cycles. Our advantage is that with the autoclave we can make fins without variability – two fins feel exactly the same in the water.
The surface, the trailing edge and the leading edge are ground with SiC grinders up to 1200 grit. This treatment gives a smooth surface for laminar flow. A clean and degreased surface of the fin is important for optimal performance without spin-outs. Each fin is checked for quality before delivery to the customer. The boxes are adapted to tuttle and deep tuttle boxes for most boards. Since 2022, we have been producing boxes made of 100% prepreg carbon as standard.