JJF Medium Thruster Surfboard Fins – FCS II | Curve

Curve JJF Medium FCS2 Thruster Fins offer improved manoeuvrability and precision without sacrificing hold in bigger, more powerful waves

Extra base surface area and sweep / rake provide structural projection and reliable hold through powerful turns, helping maintain connection with the wave face while managing the high speeds generated in larger surf

Featuring lightweight fibreglass Hexcore construction for a balance of strength and performance

Improved Manoeuvrability & Precision – Responsive handling for precise turns in powerful conditions without sacrificing hold

Speed & Connection – Designed to manage high speeds and harness the energy of a powerful wave face for connected, controlled surfing

Fibreglass Hexcore Construction – Lightweight honeycomb core construction for a balance of strength and performance

Control & Precision – Supports confident, precise turns in powerful surf

Medium Size – Suited to surfers looking for a balance of responsiveness, control and hold, particularly on larger boards with more rail engaged in the wave face

FCS II Base System – Designed for compatible FCS II fin boxes

Specifications

• Model: JJF Thruster – Medium
• Configuration: Thruster – 3 fins
• Template: Neutral drive
• Size: Medium
• Construction: Fibreglass Hexcore
• Fin system: FCS II style

Side Fins – 2 fins

• Height: 4.56" / 115.8 mm
• Base: 4.45" / 113.0 mm
• Area: 14.98 in² / 96.6 cm² per fin
• Foil: Flat
• Angle: 6.5°

Rear / Centre Fin – 1 fin

• Height: 4.56" / 115.8 mm
• Base: 4.45" / 113.0 mm
• Area: 14.98 in² / 96.6 cm² per fin
• Foil: Symmetrical

Ideal Conditions

Big, heavy, powerful and barreling waves where control and precision are essential. Suited to larger boards with more rail engaged in the wave face, providing reliable hold, improved manoeuvrability and controlled release through committed turns

Who Are These Fins For?

The JJF Medium Thruster Fins are suited to surfers in the weight range of 55–80 kg who want improved manoeuvrability and precision in bigger, more powerful conditions without sacrificing hold.

They are particularly suited to larger boards with more rail engaged in the wave face, where managing speed, maintaining connection and controlling powerful turns are critical.

The extra base surface area and sweep provide a balance of hold, projection and responsiveness, helping maintain control at speed through critical sections.

Frequently Asked Questions

What conditions are Medium fins best suited to?

They are designed for powerful surf, including heavy and barreling waves where control and precision are priorities

Are these fins suitable for larger boards?

Yes, they are suited to larger boards with more rail engaged in the wave face, where maintaining hold, managing speed and controlling turns are important

What is Hexcore fin construction?

Hexcore fins use a lightweight honeycomb core within a fibreglass construction, helping balance weight, stiffness and performance

Are these sold as a thruster set?

Yes, this is a three-fin set for a thruster configuration

Which fin system do they fit?

These fins use an FCS II-style base designed for compatible FCS II fin boxes

JJF Thruster Fins – Medium

A performance-focused fin set offering improved manoeuvrability and precision without sacrificing hold in bigger, more powerful waves, particularly on larger boards with more rail engaging the wave face