MOLDED CARBON FINS FOR

WINDSURFING AND KITESURFING SPEED AND RACING

Matching your board and sailing style with the right fin helps to provide the speed and control you need to win. The right fin balances the forces on the board, helps you plane up earlier and keeps you planning through transitions and lulls.

HOW WE WORK WITH YOU

We can customize the fin according to your sailing style, location, and board. F4 has five designs each that can be customized for you. It sounds like alot, but we can guide you through the process to make sure you get the right fin. To get started, simply send us a email to F4 Fins

THE F4 DIFFERENCE - WHY MOLDED CARBON?

F4 flex technology is based on a high pressure elevated curing process. F4 Fin structural layers cover the outer surfaces, unlike machined G10 fins. When a G10 fin flexes, the layers are pulled apart at the bond lines. When an F4 fins flexes, its a continuous fiber along the entire length of the outer surface that takes the load. Its why an F4 fin doesn't wear out like G10 fins.

ITS NOT JUST ABOUT LENGTH!

Its about balance and control. Flex, Rake, and Surface Area play key roles in in the position of the center of pressure of your fins. The of pressure is the point on your fin where the sum of the hydrodynamic forces act. Like the draft on your sail, if the center of pressure is near the bottom of the board you get lift with control, if its near the tip you get lift with pitch.

The right fin will make your board lift more out of the water and provide the combination of speed and control. Too much lift, will cause tail walking, too little will cause your board to be nose down.

YOUR CUSTOM FIN

We work with you to determine the best option for your board, sailing location and objectives and can customize the following -

Rake - the angle of the fin from the base, as measured from the penpendicular to the tip.

Flex - Soft fins are working well in many conditions. Our fins come in seven grades of stiffness: XXS (extra extra soft), XS (extra soft), S (soft), SM (soft medium), M (medium), MS (medium stiff), and H (stiff)

TIP AREA (SURFACE AREA DISTRIBUTION) -The fin can be cut from the base or tip. Cutting the tip creates a more powerful, lifting fin. Cutting at the base reduces the chord overall and creates a more controllable fin. For example, a 74-4 fin is made from a 74cm with 4cm cut from the tip, creating a larger tip area. The CRAD can be made up to 90cm long, BB-80cm, E -76cm, D2-76cm.

WHAT TO PICK

For the Mike's Lab 10, the best all around race fins are the BB design from 64 to 80-10. The CRAD's are also good from 68cm to 76-6 XXS.

For slalom and kite, the D2 for high wind (32cm-46cm), and the CRAD or E up to 52cm.