Foil Assist Mast Set D/LAB

Crafted for unparalleled performance and control, the D/LAB mast features a slim, low-drag profile that ensures playful and precise turning, exceptional rigidity, and maximum speeds. Constructed with High Modulus Carbon fibre and optimised fibre orientation, the D/LAB Mast achieves superior bending and torsional stiffness. Additionally, its optimised base plate design significantly reduces resistance during take-off and landing, while the tapered chord length and thickness maximize strength while minimising drag. 

Measuring 84 cm, the Foil Assist Mast D/LAB is particularly 
well-suited for prone and downwind-oriented riders. It is also ideal for wake foiling and light wind wing foil sessions.

Powered by a high-torque motor that offers a maximum thrust of 33 kg, this mast enables users to pair it with smaller foils and boards, resulting in greater responsiveness, manoeuvrability, and control. Safety and efficiency are further enhanced by a powerful folding gear propeller that only opens and rotates when the motor is engaged and automatically closes upon releasing the ring controller button, ensuring minimal drag and enhanced safety.

The placement of the receiver in the battery box on the harness ensures optimal signal transmission to and from the remote, providing reliable power throughout your session. This makes it particularly suitable for seasoned foilers looking to explore new possibilities with their equipment.

While it is less modular than the alloy version, the D/LAB Mast is specifically compatible with the 3BS fuselage and SLS wing sets, as well as the (Monobloc) Tail D/LAB and D/LAB wing sets. When it comes to mounting foils from other brands, only Armstrong foils can be connected using our specially designed fuselage. Moreover, the carbon mast can be attached to any brand's foil board utilising standard US foil tracks. For optimal performance, we strongly recommend combining the D/LAB Mast with the specially designed Duotone Midfish foilboard.

Unlike conventional systems that mount the batteries on the mast top plate or the board, the Duotone Foil Assist batteries (2 x 1 kg) are placed in a waterproof box attached to a comfortable waist harness. This arrangement ensures that the board-foil setup remains perfectly balanced despite the motor, preserving the pure feel of foiling as much as possible. A backpack with batteries has the disadvantage of placing weight on the shoulders, which can disrupt balance during turns and quick movements.

With the harness, the weight sits on the hips, where it does not affect your balance, and you have full freedom of movement in your upper body. You will hardly notice the weight of the harness (approximately 3.76 kg, including the box and batteries) after just a few minutes. The connection between the batteries and the motor is made via a cable that runs along a shorter leash from the battery box to the top plate of the mast. The board leash is attached below the cable port of the battery box to the harness. The receiver for the remote control is mounted in the lid of the battery box, ensuring a more reliable connection between the remote and the motor, as the Bluetooth signal is not disrupted by water.

The eHarness has been designed with a clear focus on safety and user-friendliness. The magnetic buckle and the Velcro neoprene strap allow for quick and easy removal. With the adjustable buckle, you can customize the harness to fit your individual waist size. If you need to detach the harness underwater, you can easily do so with a quick tug. Additionally, the harness is made from non-water-absorbing materials and features built-in buoyancy, allowing it to float independently and not pull you down in the water. To prevent the battery box from opening under water pressure, it is protected with a neoprene cover that can be opened using a large zipper.

When developing the Foil Assist, our primary goals were to create a system that is light, small, and simple to maintain, while preserving the pure feel of foiling as much as possible. We achieved this by strategically placing the batteries (2 × 1 kg) in a waterproof case on a waist harness, rather than on the board or the top plate of the mast.

To connect the batteries to the motor integrated into the mast, a cable runs alongside a shorter leash from the battery box to the top plate of the mast. The shorter board leash connects just below the cable port of the battery box to the harness.

Riders will quickly get used to the weight of the harness (approximately 3.76 kg, including the box and batteries), while appreciating the feeling of an evenly balanced board with no excess weight beneath their feet. This innovative battery placement improves the motor’s responsiveness and ensures quicker acceleration compared to traditional battery placements underneath the board.

The harness has been designed with safety and simplicity in mind. Its magnetic attachment system allows for quick and easy detachment, making it user-friendly for all riders. For a tailored fit, the adjustable sizing buckle accommodates various body sizes from S-M to L-XXL. To provide added peace of mind while riding, the harness is equipped with a quick-release safety mechanism. Additionally, it is constructed from non-water-absorbing materials and features built-in buoyancy, allowing the harness to float independently and providing an extra layer of safety in the event of a fall. To prevent the battery box from opening during wipeouts, we included a neoprene cover with an easy-to-open zipper on top.

Recommended Board & Foil Setup

Midfish

Crush SLS (40 L)

Fuselage Aero Tail D/LAB Monobloc Tail PX D/LAB Monobloc Tail S D/LAB

Crest D/LAB

Glide 2.0 D/LAB

Back Wing Stabilizer S Back Wing Stabilizer H

SIZES

S – M (WAIST MEASUREMENTS: 71 – 89 CM / 28" – 35")

L – XXL (WAIST MEASUREMENTS: 89 – 114 CM / 35" – 45")