AFS UHM Carbon Mast

The AFS UHM Carbon Mast represents the top of the standard-profile AFS mast range. Ultra High Modulus carbon is up to twice as stiff as standard carbon and around 40% stiffer in torsion compared to HM — the result is a mast with near-zero energy-robbing flex that delivers every pump, every carve, and every foil input with absolute immediacy. For advanced riders and racers chasing maximum performance, this is where the AFS lineup peaks before the Skinny variant.

Available in five configurations — 75cm, 80cm, 85cm, 95cm, and a dedicated 95cm Race — the UHM covers everything from all-round high-performance AFS foils riding through to committed race course sailing and open-ocean downwinding where extra mast length provides crucial clearance.

Who It's For

The UHM is built for advanced and expert riders across wing foiling, kite foiling, surf foiling, downwinding, and SUP foiling who prioritise performance over all else. If you pump hard, carve aggressively, and are actively chasing speed — this is your mast. The 95cm and 95cm Race lengths are particularly suited to riders entering or competing in organised foil racing events where mast clearance and stiffness margins are critical. The UHM is not recommended for beginners: its near-zero flex makes error correction harder and touchdowns feel far more abrupt than on HR or HM.

Key Features

• UHM (Ultra High Modulus) carbon — up to 2× stiffer than standard carbon, ~40% stiffer in torsion than HM
• ~26% stiffer in flex compared to the HM grade
• Maximum energy transfer: every pump, carve, and input is delivered without delay
• Five length options: 75cm, 80cm, 85cm, 95cm, 95cm Race — the widest range in AFS high-performance masts
• Dedicated 95cm Race variant optimised for race-course and long-distance foiling
• Full Fuselink compatibility: Fuselink base to fuselage, standard top to board
• Thinner profile than HR for reduced hydrodynamic drag at high speed
• Suits all disciplines: wing foil, kite foil, surf foil, downwind, SUP foil

On the Foil

Riding on UHM is a fundamentally different experience to HR or HM. The absence of flex means the foil responds instantly — which feels incredible when you're pumping efficiently and carving hard, but demands clean technique throughout. Sloppy pumping gets punished rather than absorbed; a lazy carve snaps back rather than easing through. At speed, the UHM's thinner profile generates meaningfully less drag than the HR, and you'll notice longer glide times and a higher ceiling on top-end speed. For downwinders and race sailors, the stiffness also matters for upwind performance — every watt of sail or wing energy goes directly into forward thrust with no loss to mast flex. The 95cm Race variant is worth noting separately: that extra 10cm of clearance makes a real difference in steep ocean swell and allows more aggressive foil angles without risk of mast tip breach.

Compatibility & Setup

The AFS UHM Carbon Mast uses the Fuselink system — AFS's proprietary conical mast-to-fuselage connection fastened by two M8 screws. The Fuselink base is compatible with all current AFS Fuselink fuselages. The top plate connects via a standard US double-rail box plate or AFS board box. Fuselink is not compatible with Tuttle, Deep Power, or other proprietary box systems without an adapter. Riders on older AFS Performer fuselages will require the AFS Switch Fuselage to use the UHM with current wing ranges. The 95cm and 95cm Race lengths are suited to larger boards and open-water conditions — check your board's mast box position allows for correct foil placement at these lengths.

Construction

Ultra High Modulus carbon fibre has the highest stiffness-to-weight ratio in the AFS range. The UHM fibre's higher Young's modulus allows AFS to produce a thinner mast profile that surpasses HM rigidity — delivering better hydrodynamics and better mechanical performance simultaneously. The carbon fibre layup uses 0° alignment for flexural stiffness and approximately 45° for torsional rigidity, with UHM-grade fibre throughout the full length. The 95cm Race variant uses an optimised layup for extended-length stiffness, maintaining rigidity margins across the full mast span. Manufacturing tolerances on UHM masts are tight — any variation in fibre tension or resin distribution is more consequential at this grade, so AFS's quality control process is critical to achieving consistent performance.

Spec Table

Pairs Well With

Match the UHM mast with the rest of the AFS range, mount it to a performance wing foil board, and complete the build with a high-aspect wing foil foil setup for a serious race or performance package.

Why We Stock It

The UHM is the mast you move to when you're no longer asking questions about whether your technique is good enough — you just want the equipment to reflect your riding level. We stock the full length range including the Race variant because we have customers who compete and who need the right tool for the job. If you're chasing personal bests on the water, this is where you start the conversation.

FAQs

What does UHM mean on an AFS mast?

UHM stands for Ultra High Modulus — the stiffness grade of the carbon fibre. UHM carbon is up to twice as stiff as standard carbon and approximately 40% stiffer in torsion and 26% stiffer in flex than HM carbon. It's the top tier of the AFS standard-profile mast range, delivering maximum energy transfer and minimum flex for race and high-performance riding.

How does UHM compare to HR and HM?

All three grades step up in stiffness from HR (most forgiving) through HM (intermediate-advanced performance) to UHM (maximum rigidity). HR suits beginners and all-round riders. HM is the performance sweet spot for most advanced riders. UHM is for expert and race-level riders where every fraction of lost energy to flex costs time or speed. The jump from HM to UHM is significant — expect a noticeably more direct, demanding ride.

What is the 95cm Race variant?

The 95cm Race is a dedicated racing-optimised version of the 95cm UHM mast. The extra length (versus the standard 85cm and 80cm options) provides greater mast clearance for aggressive foil angles in ocean swell, and the Race-tuned layup maintains stiffness margins across that extended length. It's designed for riders competing in foil racing events or undertaking serious long-distance downwind runs where consistent performance across a full session is essential.

Is the UHM suitable for everyday recreational riding?

The UHM can be used for everyday riding if you're an advanced rider with solid technique. However, the near-zero flex is less forgiving than HR or HM — bad touchdowns feel harder, and sloppy technique gets amplified rather than smoothed. For recreational riders who aren't actively racing or pushing for maximum speed, the HM is a better everyday choice. The UHM is best appreciated when your technique is consistent and you're actively chasing performance.

Is the AFS UHM mast compatible with my board and fuselage?

The UHM uses the Fuselink connection — compatible with all current AFS Fuselink fuselages. The top plate fits standard US double-rail box boards or AFS-specific board boxes. Not compatible with Tuttle, Deep Power, or other proprietary connections without an adapter. If you have an older AFS Performer fuselage, you'll need the AFS Switch Fuselage.

How should I care for a UHM carbon mast?

Rinse with fresh water after every session, especially around the Fuselink connection points. Store in a mast bag — avoid point-loading, which can crack UHM carbon more readily than lower-modulus grades. Check M8 Fuselink screws for correct torque before riding. UHM carbon is extremely stiff but less impact-tolerant than HR: treat any collision damage or unexpected delamination seriously and inspect the mast before riding again.