FCS H4 CF Medium Thruster Fins

The FCS II H4 Fin represents an innovative approach to high-performance fin design, combining precision Swiss engineering, high-density unidirectional carbon fibre, and revolutionary fin geometry. Developed to deliver exceptional speed, drive, and control, this fin set provides a smooth, predictable response, even in the most demanding surfing conditions.

The defining feature of this set is the combination of distinct side and centre fin templates. The side fins feature a lower section designed to maximise acceleration, while their distinctive hatchet-shaped tips provide stability and control throughout turns. The centre fin features a highly raked elliptical outline, engineered to reduce drag and deliver progressive, predictable release during manoeuvres.

The fins feature a thicker base and progressively tapered tip, optimising flex and regulating energy release during rail-to-rail transitions. This geometry promotes a dynamic response while maintaining speed and stability when greater pressure is applied through the fins.

The H4 construction, developed through precision Swiss engineering, uses high-density unidirectional carbon fibre, with specifically oriented fibres designed to optimise energy transfer and promote acceleration. The result is an exceptionally lightweight, strong structure engineered to convert the energy applied throughout turns into speed and projection.

Another key innovation is the Dynamic Trailing Edge, featuring an internal composite that deforms under extreme loads. This technology allows surfers to push harder against their fins while maintaining a controlled response and helping reduce the likelihood of sliding out during powerful manoeuvres.

The manufacturing process combines specialised robotic automation and camera-assisted quality control, ensuring precise geometry and consistency across the fin set. Part of the Accelerator - Find Control family, the FCS II H4 delivers speed, flow, and dynamic responsiveness with additional control.

Versatile across a wide range of conditions, these fins excel particularly in critical overhead waves, where stability and predictability at high speeds are essential. They are especially recommended for performance shortboards with moderate-to-low rocker equipped with FCS II fin boxes.

Key Features:

High-performance three-fin Thruster set

Precision Swiss engineering

H4 construction with high-density unidirectional carbon fibre

Distinct side and centre fin templates

Hatchet-shaped side fin tips for stability and control

Highly raked elliptical centre fin for predictable release

Thicker base and progressively tapered tip for optimised flex

Dynamic Trailing Edge for increased control under extreme loads

Excellent combination of speed, drive, and stability

Robotic manufacturing with camera-assisted quality control

Accelerator - Find Control fin family

FCS II Fin System

Technical Specifications:

Brand: FCS

Model: FCS II H4 Fin

Configuration: Thruster (3 fins)

Fin Family: Accelerator - Find Control

Construction: H4

Material: High-density unidirectional carbon fibre and composite materials

Side Fin Template: Acceleration-focused lower section with hatchet-shaped tip

Centre Fin Template: Highly raked elliptical outline

Technology: Dynamic Trailing Edge

Fin System: FCS II

Available Sizes:

Small (S): 55-70 kg

Medium (M): 65-80 kg

Large (L): 75-90 kg

Recommended Conditions:

A wide range of surfing conditions

Critical overhead waves

Conditions demanding stability and control at high speeds

Recommended Board Types:

Performance shortboards

Surfboards with moderate-to-low rocker

Boards equipped with the FCS II Fin System

Ideal For:

Surfers seeking maximum performance

High-speed surfing and powerful manoeuvres

Riders who value drive and control

Fast turns with smooth rail-to-rail transitions

Surfers seeking predictable performance in demanding waves