Foil Cruise Mast Set

With the Foil Assist Cruise Mast AL, the motor pod is positioned lower on the mast, precisely 15 cm above the fuselage. Despite this adjustment, it retains all the features of the Foil Assist Mast AL, including internally routed cables that ensure better glide and maneuverability, and a rigid, surf-inspired profile for precise control and instant responsiveness, minimizing drag for smoother and more efficient sessions.

Safety is paramount with the Foil Assist Cruise Mast AL; therefore, it comes with an optional propeller safety guard that attaches easily with three small screws to the motor. This feature is especially recommended for those new to foiling with electric propulsion. However, please keep in mind that using the safety guard increases energy consumption, resulting in more drag and reduced battery runtime. To counter this, we recommend pairing the mast with larger foil and board sizes.

Equipped with a powerful folding gear propeller, the propeller only opens and rotates when activated and automatically closes upon releasing the ring controller button, ensuring minimal drag and enhanced safety. If additional torque is needed, the plastic propeller blades can be replaced with more robust and also sharper aluminum power propeller blades.

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.  
The batteries offer an average runtime of approximately  30 minutes, although actual ride time can vary based on skill level, weight, riding conditions, chosen speed, board and  foil size.

Designed for complete modularity, the Foil Assist Cruise Mast AL allows for effortless swapping of motor and connector cables within the entire Assist mast range. Its fuselage adapter system is compatible with most major foil brands, including Duotone, F-One, Armstrong, Gong, Axis, Lift, North, Code, Sab, AFS, and KT. This compatibility grants you the freedom to utilize your preferred foils while reaping the benefits of the advanced Duotone Foil Assist technology. Additionally, the mast can be attached to any mid-length foil-board featuring standard US foil tracks, enhancing its versatility.

To maximise battery runtime with your Foil Assist, we recommend using a front wing with a surface area of 900 cm2 or larger, along with a board that has a minimum volume of 35 L. For beginners and schools, we particularly recommend combining the Foil Assist with the Midfish Air board. This setup also allows the battery box to be positioned on the tail of the board, offering an alternative to using the harness.

While the assist system may not offer the range or full integration of traditional eFoils, it is significantly smaller and lighter, enabling configurations that dedicated eFoils cannot achieve. Most importantly, you can run this assist setup using your existing boards and foils. To increase the ride time, we recommend purchasing an additional set of batteries.

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

ePropeller Guard Cruise

Midfish / Midfish Air

Skybrid / Skybrid SLS / Skybrid Air

Duotone Adapter Fuselage Fuselage Aero AL 3BS

Fuselage Aero Tail D/LAB

Free

Free SLS

Glide 2.0 SLS

Glide 2.0 D/LAB

Crest D/LAB

SIZES

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

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