Duotone Foil Assist Compatibility Guide: Which Foils Work With It?
One of the cleverest features of the Duotone Foil Assist system is that you do not necessarily need to replace the foil platform you already own.
If you currently ride Duotone, Armstrong, AXIS, Code Foils, F-One, KT, North or several other foil brands, there may be a compatible route into the Duotone Foil Assist ecosystem.
That can allow you to keep the front wings, stabilisers and foil feel you already know while adding an integrated electric-assist mast.
Armstrong riders have a particularly interesting option. Rather than using a simple Armstrong mast adapter, Duotone produces a dedicated 60cm Duotone eFuselage – Armstrong that works with Armstrong A+ Wing Sets.
There is, however, one important warning:
Do not assume every adapter or fuselage works with every Duotone Foil Assist mast or every generation of third-party foil.
The Foil Assist AL, Foil Cruise AL and Foil Assist D/LAB do not share identical foil compatibility. The Armstrong solution also works differently from most of the other brand adapters.
This guide explains the main compatibility routes and what you should check before ordering.
Quick answer: which foils work with Duotone Foil Assist?
The aluminium Duotone Foil Assist mast platform has compatibility routes for foil brands including:
- Duotone;
- Armstrong;
- AXIS;
- Code Foils;
- F-One;
- KT;
- North;
- AFS;
- SAB Foil;
- Gong;
- Lift.
Most of these use a brand-specific fuselage adapter between the aluminium eMast and the rider’s existing foil system.
Armstrong is different. Armstrong riders use the dedicated Duotone eFuselage – Armstrong. When it is paired with a Foil Assist AL or Foil Cruise AL mast, the separate Duotone fuselage adapter is also required. With the Foil Assist D/LAB mast, the Armstrong eFuselage connects through its 3BS interface without that additional aluminium-mast adapter.
Always confirm the foil brand, wing system, fuselage generation and Foil Assist mast before buying.
Why buy through a specialist foil retailer?
Foil Assist compatibility is not simply a case of matching two brand names.
At The SUP Company, we look at the complete build: the board, mast, adapter, fuselage, front wing, stabiliser, rider weight and intended use. This matters because a setup can be mechanically compatible without being particularly well suited to assisted prone, downwind or light-wind wing foiling.
We support technical foil equipment through our bricks-and-mortar stores and selected equipment can be demonstrated through Try It Now at The SUP Co x Lymington.
How does the Duotone Foil Assist adapter system work?
The electric motor, folding propeller and power cable are integrated into the Duotone eMast.
The bottom of the mast must then connect to the foil system beneath it. With the aluminium mast platforms, that connection is normally created by a brand-specific fuselage adapter.
A typical aluminium-mast build is:
foil board → Foil Assist AL or Foil Cruise AL eMast → brand-specific adapter → compatible foil components.
The exact components retained beneath the adapter vary between brands. This is why it is better to provide the complete name of your foil and fuselage rather than simply saying, for example, “I have an AXIS foil”.
How the Armstrong connection differs
Armstrong compatibility is created using a complete, purpose-built 60cm fuselage rather than a small Armstrong-specific adapter.
With an aluminium mast, the build is:
foil board → Foil Assist AL or Foil Cruise AL eMast → Duotone fuselage adapter → Duotone eFuselage – Armstrong → compatible Armstrong A+ Wing Set.
With the D/LAB mast, the build is simpler:
foil board → Foil Assist D/LAB eMast → Duotone eFuselage – Armstrong → compatible Armstrong A+ Wing Set.
This distinction is important. Ordering the Armstrong eFuselage alone is not enough for an aluminium Foil Assist mast; the separate Duotone adapter is also required.
Board compatibility: what board do you need?
The Duotone Foil Assist eMasts mount to foil boards using standard twin US foil tracks. This means a large number of modern foil boards can physically accept the mast.
Physical fit is only the starting point. The board must also be appropriate in terms of:
- foil-track position;
- strength around the foil boxes;
- board volume;
- length and width;
- ability to accelerate cleanly;
- intended foiling discipline;
- rider weight and experience.
An efficient mid-length board such as the Duotone Midfish makes particular sense because its longer, narrower shape builds speed efficiently before take-off.
Duotone foil compatibility
If you want to stay completely within the Duotone ecosystem, the Duotone Foil Assist Adapter Fuselage – Duotone provides the connection required for the aluminium Foil Assist mast platform.
This is generally the most straightforward route for somebody who already owns compatible modern Duotone foil components.
The Foil Assist D/LAB mast has a moulded 3BS connection and therefore uses compatible Duotone 3BS fuselages directly. Do not order an aluminium-mast adapter for a D/LAB build unless it is specifically required by the chosen configuration.
Armstrong foil compatibility
Duotone has developed the Duotone eFuselage – Armstrong specifically for riders who want to combine Armstrong A+ Wing Sets with Duotone Foil Assist.
The dedicated aluminium fuselage measures 60cm, or 24 inches, and uses a 3BS mast connection.
It is compatible with all three Duotone Foil Assist mast options, but the required connection depends on the mast:
- Foil Assist D/LAB: the Armstrong eFuselage connects directly through the D/LAB mast’s 3BS interface.
- Foil Assist AL: the Armstrong eFuselage works, but the separate Duotone fuselage adapter is also required.
- Foil Cruise AL: the Armstrong eFuselage again requires the separate Duotone fuselage adapter.
This gives established Armstrong riders a proper manufacturer-developed route into Foil Assist without having to replace their complete Armstrong wing collection.
It can make particular sense for riders using Foil Assist for:
- assisted prone-foil take-offs;
- downwind starts and linking bumps;
- wake foiling;
- light-wind wing foiling;
- increasing the number of usable runs in marginal conditions.
Choose the Armstrong eFuselage if you want to retain compatible Armstrong A+ front and rear wings. Do not confuse it with a simple mast adapter or assume it works with every historic Armstrong component.
AXIS compatibility
Many AXIS riders have already invested in several front wings, rear wings and fuselage options.
The Duotone Foil Assist Adapter Fuselage – AXIS allows compatible AXIS foil setups to connect to the aluminium Foil Assist mast platform.
This means you can potentially retain the AXIS foil character you already understand rather than rebuilding the complete setup around another foil system.
It is especially relevant for prone, downwind, pump, surf and light-wind wing-foil riders. Read our AXIS Wing Foil Setup Guide if you are also choosing the foil itself.
Code Foils compatibility
The Duotone Foil Assist Adapter Fuselage – Code gives Code Foils riders an aluminium-mast compatibility route.
This is particularly attractive for surf and downwind riders who already know which Code front wing and tail combination works for them.
F-One compatibility
Duotone offers a dedicated F-One Foil Assist fuselage adapter for compatible foil setups using the aluminium Foil Assist mast platform.
F-One has used different foil connections and generations, so send us the precise mast, fuselage and wing details before ordering. The existence of an F-One adapter does not mean every historic F-One foil component is automatically compatible.
KT compatibility
KT riders can use the Duotone Foil Assist Adapter Fuselage – KT with compatible aluminium Foil Assist mast setups.
This can be a useful route for somebody already using a KT surf or downwind setup who wants electric assistance without unnecessarily changing the foil underneath them.
North compatibility
The Duotone Foil Assist Adapter Fuselage – North provides an aluminium-mast connection for compatible North foil systems.
Confirm the exact North fuselage generation before ordering rather than relying on the brand name alone.
AFS compatibility
The Duotone Foil Assist Adapter Fuselage – AFS allows compatible AFS foil components to connect to the aluminium Foil Assist mast system.
This is another example of how the aluminium Duotone system can support riders who already have a developed foil quiver.
SAB Foil compatibility
The Duotone Foil Assist Adapter Fuselage – SAB Foil provides a route for compatible SAB Foil systems using the aluminium Assist mast.
If you already own several SAB front wings, retaining those wings may make adding Foil Assist considerably more attractive.
Gong compatibility
A dedicated Duotone Foil Assist Adapter Fuselage – Gong is available for compatible Gong foil setups using the aluminium Foil Assist platform.
As with the other brands, confirm the precise Gong foil generation because brand-level compatibility should not be taken to mean that every older component will fit.
Lift compatibility
Duotone also offers a Lift-specific adapter route for compatible Lift foils using the Foil Assist AL and Foil Cruise AL mast platforms.
Lift should therefore be treated as an aluminium-mast compatibility option rather than assumed to work directly with the D/LAB mast.
Browse the current Duotone Foil Assist adapters and accessories or contact us with the exact Lift mast, fuselage and wing generation before ordering.
Duotone Foil Assist compatibility table
| Foil brand | Foil Assist AL / Cruise AL route | Foil Assist D/LAB route | Important check |
|---|---|---|---|
| Duotone | Duotone fuselage adapter required | Compatible 3BS fuselage connects directly | Confirm the exact Duotone fuselage and wing generation |
| Armstrong | Armstrong eFuselage plus separate Duotone adapter | Armstrong eFuselage connects directly | Designed for compatible Armstrong A+ Wing Sets |
| AXIS | AXIS-specific adapter route | Not through the standard AL adapter | Confirm the precise AXIS fuselage system |
| Code Foils | Code-specific adapter route | Not through the standard AL adapter | Confirm the exact Code setup |
| F-One | F-One-specific adapter route | Not through the standard AL adapter | Foil generation is particularly important |
| KT | KT-specific adapter route | Not through the standard AL adapter | Confirm the exact KT fuselage |
| North | North-specific adapter route | Not through the standard AL adapter | Confirm the North foil generation |
| AFS | AFS-specific adapter route | Not through the standard AL adapter | Confirm the complete AFS setup |
| SAB Foil | SAB-specific adapter route | Not through the standard AL adapter | Confirm the mast and fuselage generation |
| Gong | Gong-specific adapter route | Not through the standard AL adapter | Confirm the foil generation |
| Lift | Lift-specific adapter route | Not through the standard AL adapter | Confirm the exact Lift system before ordering |
“Not through the standard AL adapter” does not necessarily mean that no specialist or future option will ever exist. It means you should not assume that an adapter sold for the aluminium mast can be transferred to D/LAB.
Foil Assist AL vs D/LAB compatibility
This is one of the most important distinctions in the entire system.
Foil Assist AL and Foil Cruise AL
The aluminium eMasts have the broadest compatibility because Duotone offers a range of brand-specific fuselage adapters.
A fuselage adapter is not normally included with the mast set and must be selected separately for the foil system you intend to use.
Foil Assist D/LAB
The Duotone Foil Assist D/LAB uses a premium carbon mast with a moulded 3BS connection.
Its standard compatibility route is much narrower than the aluminium platform. It is designed to connect to compatible Duotone 3BS fuselages and the purpose-built Duotone eFuselage – Armstrong.
Do not assume that an AXIS, Code, F-One, KT, North, AFS, SAB, Gong or Lift adapter intended for the aluminium eMast will work with D/LAB.
This is exactly the sort of relatively small component that can delay a complete premium setup when compatibility has been assumed rather than checked.
Can I use my existing foil front wing?
Potentially, yes. Retaining an existing wing system is one of the main reasons these adapters and the Armstrong eFuselage exist.
Compatibility and suitability are not the same thing, though.
Your front wing may connect mechanically but still be a poor Foil Assist choice if it is:
- too small for your weight or ability;
- very high in stall speed;
- inefficient during take-off;
- poorly matched to the board;
- designed for a different foiling discipline;
- unbalanced with the chosen stabiliser or fuselage.
For the Foil Assist AL system, a front wing of around 900cm² or larger is a sensible starting point for efficient battery use, although the ideal wing depends on rider weight, board, conditions and experience.
Can I use my existing foil board?
If your board has suitable standard twin US foil tracks, it may accept the Duotone eMast.
We still need to consider:
- foil-track position;
- board construction;
- board volume;
- how easily the board accelerates;
- your body weight;
- whether you intend to prone, downwind, wake or wing foil.
A board that works brilliantly for conventional wing foiling may not be the most efficient choice for prone or downwind Foil Assist use.
Can I use one Foil Assist system with several foil brands?
Potentially, particularly with the modular aluminium mast platform.
An experienced rider could use one compatible Foil Assist AL mast with different brand adapters and foil systems. Armstrong riders would use the complete Armstrong eFuselage together with the Duotone adapter rather than a small Armstrong adapter.
Swapping between systems increases the importance of using the correct hardware, following the specified torque settings and checking every connection before entering the water.
Which Duotone Foil Assist mast should you choose?
Foil Assist AL
Choose the 84cm Foil Assist AL if you already foil and want the widest choice of compatible foil brands at a more accessible price than D/LAB.
Foil Cruise AL
Choose the 80cm Foil Cruise AL if easier progression, controlled cruising and sustained electric assistance are more important than the most surf-orientated response.
Foil Assist D/LAB
Choose Foil Assist D/LAB if you are an experienced rider prioritising lower weight, lower drag and premium mast response, and you intend to use compatible Duotone components or the dedicated Armstrong eFuselage.
For a broader system comparison, read our Duotone Foil Assist vs Foil Drive Gen 2 guide.
What we need to confirm compatibility
If you are unsure, send the Lymington team:
- your foil brand;
- front-wing model and size;
- rear-wing or stabiliser model;
- fuselage model and length;
- approximate model year;
- a clear photograph of the mast-to-fuselage connection;
- your board model and volume;
- your body weight;
- the type of foiling you want to do;
- whether you are considering Foil Assist AL, Cruise AL or D/LAB.
For Armstrong riders, please also confirm whether your components use the Armstrong A+ System.
That information is normally enough for us to sanity-check the proposed build before you spend money on the wrong component.
Try Duotone Foil Assist at Lymington
Selected Duotone Foil Assist equipment is supported through Try It Now at The SUP Co x Lymington.
This is particularly useful when comparing premium mast systems, deciding whether to retain an existing foil or working out which board and front wing will suit your weight and intended use.
Demonstrations are subject to rider experience, suitable conditions, equipment availability and approval by the team.
Finance options are available on qualifying orders, which can be useful when investing in a complete Foil Assist setup. Availability can vary between individual mast, fuselage and adapter components, so contact us if timing is important.
Duotone Foil Assist compatibility FAQs
Can Duotone Foil Assist work with Armstrong foils?
Yes. The dedicated 60cm Duotone eFuselage – Armstrong is designed for compatible Armstrong A+ Wing Sets. It connects directly to the Foil Assist D/LAB mast. When used with the Foil Assist AL or Foil Cruise AL mast, the separate Duotone fuselage adapter is also required.
Is the Duotone eFuselage – Armstrong just a mast adapter?
No. It is a complete 60cm aluminium fuselage developed for compatible Armstrong wing sets. This is different from the smaller brand-specific adapters used with many other foil platforms.
Can I use the Armstrong eFuselage with Foil Assist D/LAB?
Yes. The Armstrong eFuselage has a 3BS connection and is the dedicated Armstrong-compatible fuselage route for the D/LAB mast.
Do I need another adapter with the Armstrong eFuselage?
You need the separate Duotone fuselage adapter when using the Armstrong eFuselage with a Foil Assist AL or Foil Cruise AL mast. You do not need that additional adapter when connecting it directly to the D/LAB mast.
Can Duotone Foil Assist work with an AXIS foil?
Yes. Duotone offers an AXIS-specific adapter for compatible AXIS foil setups using the aluminium Foil Assist mast platform. Check the exact AXIS fuselage and generation before ordering.
Can Duotone Foil Assist work with Code Foils?
Yes. A dedicated Code Foils adapter is available for compatible setups using the aluminium Foil Assist mast platform.
Can Duotone Foil Assist work with F-One?
Yes, through the relevant F-One adapter on compatible aluminium-mast setups. F-One has used different generations of foil components, so confirm the precise model first.
Can Duotone Foil Assist work with Lift foils?
Yes. A Lift-specific adapter route is available for compatible Lift foil systems using the aluminium Foil Assist mast platform. Confirm the exact Lift generation before ordering.
Can I use the same adapter with Foil Assist AL and D/LAB?
Do not assume so. The brand-specific adapters discussed in this guide are primarily for the aluminium eMasts. D/LAB uses a moulded 3BS connection and has a much narrower direct-compatibility route.
Does my board need a special Foil Assist box?
No proprietary Foil Assist board box is normally required. The eMast uses standard twin US foil tracks, but the board must still be suitable in its construction, track position, dimensions and volume.
Can The SUP Company check my foil compatibility?
Yes. Send us the foil brand, front wing, stabiliser, fuselage, approximate model year and clear photographs of the connections. We can help identify the appropriate route before you order.
Need a Duotone Foil Assist compatibility check?
Do not guess when putting together a premium Foil Assist system.
Send the Lymington team details and photographs of your existing foil. We will help establish whether you need a brand-specific adapter, the dedicated Armstrong eFuselage or a different combination entirely.
Browse our Duotone Foil Assist systems, view the Duotone eFuselage – Armstrong or explore the current Foil Assist adapters and accessories.