Firefly Foil Assist
Firefly by Just Foils is a foil assist designed to make downwinding, wave riding and pump foiling easier to access.
Waves, bumps and pumps. Made easier.
Firefly gives you the extra speed you need to get onto foil, helping remove the hardest part of the learning curve: the start.
More attempts, more time flying and more chance to progress.
Let the Board Do Its Job
Foil boards are shaped with purpose. Every rail, contour and surface is designed to release cleanly and move through water efficiently.
Firefly keeps the underside of the board clear, so it can lift, release and glide the way it was shaped to.
Less Weight on the Board
With Firefly, the main battery weight is carried by the rider, not fixed to the board.
The only added board weight is the motor assembly, helping the board stay responsive for pumping, carving and linking waves.
A Hip Pack You Barely Notice
Firefly sits low on the body in a comfortable hip belt, not high on your shoulders like a backpack.
It stays stable and out of the way, so you can move naturally, pump hard and ride without feeling restricted.
Reliable Signal - Always!
Because the main system is worn on the rider, Firefly avoids the signal problems that can come with burying electronics under a board.
There is no need for special signal windows, board antennas or awkward workarounds.
Your board. Not a trench board.
Ride the board you already love. Firefly does not require a special trench board or a board built around a bulky foil-assist system.
Use the board you already know, with the feel, volume and shape you chose in the first place.
Extend the Session
Firefly’s removable battery system means you are not limited to one fixed battery.
Swap in a fresh pack and keep riding, giving you the option of hour after hour on the water.
Designed With Safety First
Firefly is worn on the rider, so safety has been considered from the start.
The battery system is housed securely, carried low on the body and designed to stay stable while riding, pumping and carving. The pack is positioned away from the board and foil, with a controlled power connection and a quick-release belt, connector and leash so the rider is not locked into the setup.
What’s Included
|
Item |
Quantity |
|---|---|
|
Waterproof foil assist unit with quick detach EVA waist belt |
1 |
|
High-performance motor with coiled cable and plug |
1 |
|
Leash with cable sleeve |
1 |
|
Aluminium propeller blades |
3 |
|
Propeller hub |
1 |
|
Improved laminar-flow cable guide, no tape needed |
1 |
|
Mini pod for motor |
1 |
|
Low-profile under-board cable guides |
3 |
|
Waterproof remote control |
1 |
|
Remote control flotation strap |
1 |
|
Battery pack |
1 |
|
Dual-port battery fast charger |
1 |
|
Charger power adapter |
1 |
|
Charger power lead |
1 |
|
Battery charging leads |
2 |
|
Balance connector leads |
2 |
Technical Specifications
Specification | Details |
|---|---|
Product | Firefly Foil Assist |
System type | Rider-mounted foil assist |
Intended use | Prone, pump and downwind foiling |
Battery position | Hip-mounted battery pack |
Board-mounted battery | No |
Battery type | High-performance lithium-ion |
Battery structure | 2 × 6S3P packs used together (in series) |
Combined nominal energy | Approx. 583Wh |
Fully charged battery voltage | 50.4V max |
Battery capacity | 13.5Ah |
Motor type | High-performance brushless motor |
Motor KV | 130KV |
Motor class | 6384 class |
Motor controller | 160A high-output electronic speed controller |
Motor, prop and cable weight | Approx. 1.5kg |
Battery cell-only weight | Approx. 3.1kg |
Foil Assist unit weight (without battery) with waist belt | Approx. 2.6kg |
Runtime | Approx. 40-120 minutes |
Charging | Dual-port balance charging |
Estimated charge time | Approx. 1.5-2 hours from empty, charger and power-supply dependent |
Warranty | 12 months |
Manufacture | Made in the UK |
Additional batteries | Available separately |
Runtime
Runtime depends on rider weight, foil setup, conditions, water state, throttle use and rider ability.
Typical runtime is approximately 40-120 minutes. More efficient riders, cleaner take-offs and better pumping can significantly reduce motor use and extend the session.
Charging
The supplied dual-port charger charges both 6S packs at the same time using the included charging and balance leads.
Estimated charge time is approximately 1.5-2 hours from empty, depending on charger settings, power supply output and the balancing phase at the end of the charge.
Warranty
Firefly comes with a 12-month warranty against manufacturing defects.
As with any high-power electric marine system, correct charging, storage, handling and use are essential. Batteries should only be charged with the supplied charger and leads.