What makes MUFins so exceptional?

As described on the home page MUFins use specifically developed foils which have been optimized for the windsurfing speed range and conditions. MUFins provide nearly twice as much lift at low speeds compared to conventional fins with the same fin area. MUFins allow nearly twice as much angle of attack (flow angle) than conventional fins. On the other hand, those characteristics provide outstandig upwind performance and spin-out resistance and even the drag is much lower compared to conventional fins which makes MUFins so fast.
All these characteristics allow a very stable ride and jibing under all wind and wave conditions.

Why do MUFins have no flex?

When sailing, the wind can be very gusty (sudden change in wind speed and direction), which leads to sudden changes in sail forces that are very uncomfortable. To compensate the varying forces sail tip flex was invented that lead to very easy sail handling. But in the water there are no gusts which have to be compensated. Due to the fact that the airfoils of conventional fins have limited spin-out margins, flex was introduced to reduce the spinout problem. Therefore performance is lost.
Because MUFins are so spin-out resistant, flex is not needed and full performance is available in all conditions. Fin evaluations have shown that no flex is preferred.

Why do MUWave Fins have not the typical wave fin outline?

The typical wave fin outline is under hydrodynamical aspects regarded as highly inefficient due to the extremely high rake (swept back) at the tip. Further to provide this flex, airfoils ended up being very thin at the tip which results in early stalling. My impression is that the wave fin outline was heavily influenced by adopting from sea animals, when fins first were used on surfboards. Since then the outline has never changed and few people have questioned this approach.
Tests of MUFins in wave conditions have shown that they work perfectly in small waves as well as in real big surf with their elliptic shape.

Why are MUFins so spinout resistant ?

See first question.

Why do MUFins have an elliptic outline ?

The so called induced drag of a fin is produced by pressure equalization at the tip of the fin.
The induced drag is minimal, when the fin outline is elliptic. This has been well known for over 70 years. That‘s why MUFins have an elliptic outline – to reduce the induced drag.

What does CNC milling mean ?

CNC is a short term for Computerized Numerical Control. MUFins are designed by using a CAD program (CAD = Computer Aided Design), specific software transforms the CAD data in such a way that the milling machine mills the fin exactly to the CAD data. Therefore every MUFin has the same high precision which gives the fin the excellent performance and characteristics.

What is G-10 material ?

G-10 is a glass epoxy laminate which has been used as electro-static dissipative material. It is very stiff and it offers excellent machinability and tight tolerances. All MUFins are made of G-10.

How the fin area could be determined?

There is a very simple method to do that. Place your fin on a sheet of paper and draw the outline of your fin.
Then draw a line in parallel to the box in a distance of 0.5 cm followed by parallel lines in a distance of 1 cm until the tip of the fin as shown in the sketch. Each line represents a rectangle of 1 cm width.
Measure the distance of each line between the outline and add up all distances. The area in cm squared is equal the sum of all lines in cm multiplied by 1cm.

My fin doesnt fit the box excactly, what can I do?

fin box fitting