North Sonar UHM Foil Drive Carbon Mast

North Sonar UHM FD Carbon Mast

Foil Assist / Assisted Prone Surf & Downwind Foiling

Sizes: 80cm

When you want increased glide and sharper turning performance from your electric-assisted foil setup, the North Sonar UHM FD Carbon Mast delivers a fast, low-drag feel. Designed for seamless integration with Foil Drive systems, this mast significantly reduces hydrodynamic resistance so you can accelerate onto foil faster. You'll notice improved efficiency, extended battery run time, and precise power transfer through every turn. Upgrading to this Ultra High Modulus carbon mast keeps your motor submerged during takeoff while maintaining clean clearance once you're riding above the water.

What North has to say:

For greater glide and quicker turns, the North Ultra High Modulus Carbon Foil Drive Mast is 25% thinner and features a 14% shorter chord length than the AF80 FD Mast. This almost eliminates drag and significantly increases manoeuvrability, so you'll accelerate faster onto foil and experience more efficient glide once you're up.

The UHM Mast features a state-of-the-art monocoque design, with the motor pod seamlessly faired into the mast 18cm from the baseplate - the perfect balance for Assist with the propeller submerged, yet high enough to avoid interference when you’re up on foil. At 80cm ride height, it’s ideal for assisted prone surf and downwind foiling, with minimal battery consumption.

Who is this for?

This mast is designed for foil riders looking for hydro-efficiency, minimal drag, and fast response when using a Foil Drive system for assisted prone surf and downwind foiling.

Design Profile:

An ultra-low drag, 80cm Ultra High Modulus carbon monocoque mast featuring a faired motor pod 18cm from the baseplate and pre-installed internal wiring.

Performance Features:

• Reduced drag profile for faster acceleration onto foil and extended battery run time.
• Enhanced glide and efficient pumping performance.
• 108mm chord length providing increased manoeuvrability for tight, rapid turns.
• Extreme torsional and bending stiffness delivering direct power transfer to the foil.
• Fixed motor pod positioning for propeller immersion on takeoff and zero drag while on foil.

How does it compare?

Versus the AF80 FD Mast:

The Sonar UHM FD Carbon Mast is 25% thinner (13.5mm width) and features a 14% shorter chord length (108mm) compared to the AF80 FD Mast. This drastically cuts hydrodynamic drag, improves battery consumption, and provides lighter, more responsive turning control.

Tech Specs:

• Ultra High Modulus Prepreg Carbon - Strong, lightweight monocoque design for maximum structural rigidity and hydrodynamic efficiency.
• Integrated Motor Pod - Seamlesly faired 18cm from the baseplate to optimize propeller placement during motor assist and foil flight.
• Pre-installed Wiring - Features a pre-installed Foil Drive Puck and internal routing for connection to motor systems.
• GeoLock Connection System - Tapered geometry locking system providing a tight, optimized load-bearing fuselage connection.
• Dimensions - 80cm mast length, 108mm chord length, and 13.5mm width.