Small Line, Big Focus

This isn’t mass production. Every fin is hand-built, with designs refined for early engagement, energy efficiency, and controlled flex

Two-Fold Drag Reduction

We target drag where it matters most:

• The tip of the inside fin
• The inside edge of the outside fin

In every turn, the inside fin carries most of the lift and drive. The outside fin mainly follows—until you switch direction and it becomes the inside fin.

In a bottom turn, the inside fin carries most of the drive, while the outside fin follows—until direction changes and their roles switch.

Controlled Flex & Flow

The figure shows how a central spar, depicted by the red cone, resists the bending and twisting forces on the fin (shown by two curved arrows).

Using geometry, carbon layups, computational fluid dynamics, each fin has a controlled load-induced flex. i.e.: The fin deforms in a controlled manner to reach the optimum shape under pressure, reducing drag and improving hold.

Physics meets surfing

Tip drag reduction

Both fins are shown at the same speed and angle of attack.

• The flat foil fin leaves a large, turbulent wake (blue region).
• The Summit 164, after flexing under load, shows a much smaller drag zone, with cleaner flow around the tip.

Outside fin drag reduction

Here both images show the inside edge of the outside fin at −20° angle of attack:

• The flat foil shows delayed, messy reattachment of flow.
• The Summit fin holds a cleaner, more controlled wake, reducing drag when transitioning through turns.

Construction Options

• Black Series: Carbon fiber with foam core, ultralight and strong, epoxy matrix with a protective glass skin.
• White Series: Solid fabric epoxy, heavier but bombproof — ideal for SUP or reef impact zones.

Finish

Every fin is coated with UV-stable 2K urethane, sanded and polished to a glass-like finish. Built for performance.