Shown above: the X-15 foil with the Aluminium V8 Deep Tuttle mast


The first of our new generation of auto-optimised foils

With wings designed by the team of Martin Fischer, Charles Dhainaut and Mathieu Durand using a ground-breaking automated optimisation method, the X-15 is an astonishing foil with an incredible flight range.

Its MF 820 front wing delivers incredible efficency: take off in minimal winds, fly upwind and downwind at incredible angles, all with an impressive top speed that completes the package.

The MF 200 tail wing compliments the front wing's efficiency, while the 69cm Jumbo Evolution MkII fuselage was chosen to provide a stable and reliable platform for the X-15 concept.

This new Jumbo Evolution MkII fuselage with an integrated fin works well with the MF tail wing that is completely flat, giving the foil traction and stability.

With its incredible efficiency, the MF820 is also highly recommended for downwind foiling.

Model MSRP*
X-15 Carbon €3099
X-15 Aluminium €2099

*Manufacturer's recommended retail price incl. VAT. Actual price may vary due to local taxes and freight surcharge


Innovative and ground-breaking, the auto-optimisation 7000x process was developed by Martin Fischer, Charles Dhainaut and Mathieu Durand.

Starting from a base design and after entering desired performance parameters and structural limits, the computer first calculates an optimum shape, then feeds this new design back to itself to recalculate an even more optimised shape.

Repeated thousands of times over, this looping optimisation process is made possible thanks to a novel approach to the equations that govern fluid dynamics. Eventually, the process converges towards a hyper-optimal design, something that would have previously taken the most powerful supercomputer weeks or months to calculate (and taken a human decades!).

The result: wing designs that offer incredible flight characteristics virtually at the limit of the laws of physics.

"When people tell me a wing was designed with the help of CFD, I generally roll my eyes because more often than not, CFD was used to generate a pretty picture - it’s rare that the use of CFD was truly optimising in a significant way. 

So when Martin Fischer explained his team’s innovative automatic optimisation process that deviates from commonly-used Navier-Stokes equations to achieve numbers of iteration loops orders of magnitude higher, I couldn’t help but roll my eyes a little. 

Then I tried the wings on the water. And I was blown away. I spent the next two weeks riding these wings every single day, so addictive was that feeling of efficiency. I’ve never felt anything like it. It was clear to me that the process not only works, but it’s a leap. There will be a time before and after this milestone. 

To put it in context, I’ve been shaping boards since I was 14, then fins and then foils. There’s a certain glamour to the master-craftsman shaper who designs by feel with decades of experience. Ask any shaper and there will always be a scepticism towards computers. Shapers took a long time to accept CNC machines. Early machines were terrible and to shun machines was somewhat justified. As machines improved, CNC gradually replaced manual shaping and today, most shapers sit behind the computer that cuts foam, no longer mowing foam in the shaping bay.

When I flew for the first time on the MF820, that was my moment: I realised it would have taken me a few hundred years to come up with this wing shape through the manual, iterative method of a master-craftsman-shaper. The MF series is just the beginning. Just like the shaper’s transition from mowing foam by hand to using the mouse and keyboard, I’m so excited in the transition from iterating prototypes by moulding and testing, to this new era of auto-optimised wing designs by computer. "

Tiesda You // Starboard Foils founder and designer


Each elemental surface of the MF front wings has been determined by the auto-optimisation process.

Key shape characteristics that we can observe are that the computer opted for an ultra-high aspect ratio, a relatively thick middle section that transitions into extremely thin tips with some significant twist. 

From the top, the outline features less rake until the tips where the rounded leading edge helps prevent flow-separation for a lower stall-speed. 

MF 820 Supplied with the X-15 foil, this wing offers maximum upwind/downwind performance in lightwind to medium wind conditions. Also our most recommended wing for downwind foiling.
MF 720 The best all-rounder when wing foiling in medium winds,. Also great for downwind foiling for lighter riders or those looking for more speed.
MF 560 The smallest size offers the most speed, for wing foiling in stronger winds.

 MF 240 For light and medium wind course racing
MF 200 For medium to high wind slalom


Optimised in tandem with the front wings, the MF tail wings bring out the best in the front wings. Feeling frictionless as the glide efficiently through water, the all-flat design requires a mini vertical tail fin to be added to the fuselage, to bring back some longitudinal traction. 


Aluminium V8 Deep Tuttle

Extremely stiff, durable and more affordable, the V8 mast with a Deep Tuttle mount was selected for the X-15 One Design foil.

19mm thick and with thicker walls, the V8's extruded profile makes the mast extremely stiff. You get a rock-solid, stable feel in flight. 

With a 3cm narrower chord than our previous V7 mast, the V8 offers more glide, less drag and a super-fast top-end speed.

The connection between mast and fuselage uses an new aluminium CNC-machined adapter for maximum connection stiffness.

V8 mast length supplied with  the X-15 Aluminium: 100cm

Solid Core Carbon MkII

For those looking for maximum performance and not looking to race in the One-Design class (only the aluminium mast is race-legal), we recommend the Solid Core Carbon MkII mast in C400.

Super thin, super sharp, measuring just 13.5mm at its thinnest point, the mast profile is designed for maximum speed and maximum ventilation-resistance. This mast has a 1.5˚ fuselage-angle built-in.

The C400 is pressed with high modulus carbon at its core and ultra high modulus along the outer layers to offer outstanding stiffness, speed and performance.

Solid Core Carbon MkII Mast length supplied with the X-15: 95cm


For the X15, we chose the Evolution fuselage system. The new MkII version of this fuselage has a more streamlined tail section with an oversized cross section, maximising stiffness and stability during flight. 

Evolution MkII fuselages keep the same streamlined nose section as the MkI - so front wings remain compatible.

The mast fitting also remains the same, offering mast compatibility across all Starboard Foils masts

The tail shape is more streamlined and the fuselage is thicker. We gain in speed, control and stability.


New on all Evolution MkII Jumbo fuselages: a mini tail fin that adds traction and longitudinal stability. Combined with the thicker cross-section that reduces twist, these new Jumbo fuselages make the foil fly with rock-stability from the moment you take off to final touch-down.


X-15 Carbon X-15 Aluminium
Front Wing: MF 820 MF 820
Tail Wing: MF 200 MF 200
Fuselage: Evo MkII 69 Jumbo Evo MkII 69 Jumbo
Mast: Solid Core Carbon 95cm C400 Deep Tuttle V8 Aluminium Deep Tuttle 100cm

For One-Design racing, the X-15 foil pairs with the X-15 board. Click here to find out more about the board.


*Manufacturer's recommended retail price incl. VAT. Actual price may vary due to local taxes and freight surcharge. 


Performance scores are broad indications for general guidance only.

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