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Size can be bought. Speed must be earned.

Launch of the Seafoiler -35-
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Introducing the Seafoiler -35-

The Seafoiler -35- is the world’s first monohull foiler that combines performance with top speeds of up to 25 knots and exceptional comfort. The boat is the result of a successful collaboration between Swissroof GmbH and leading experts, including the innovative design office D3 Applied Technologies (D3), known for numerous winning boats and their work with Alinghi Red Bull Racing in the America’s Cup. The prototype is currently under construction. Launch and initial sea trials are planned for summer 2026. The Seafoiler -35- complies with World Sailing Design Category B according to ISO standards.


Characteristics

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Length Overall
10.5M
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Beam overall
3M
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Displacement
2100 kg
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Ballast
700 kg
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Air Draught Max
16.55 M
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Draught Min / Max
0.5 M / 2.5 M
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Energie Capacity
7-14 KWH
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Max. engine power
8 KW
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Mainsail
48 sqm
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Jib
31 sqm
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Code 0
63 sqm
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Asymetric Spinaker
116 sqm
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CE Certification
B4 / C6

14.89m MAST carbon, 2 Spreaders

46 KG

Lifting Rim Drive 8 kW pod motor

1.8m Hinged Bowsprit

lifting rudder

asymetric spinaker 116 sqm

Code 0, 63 sqm

JIB 31 sqm

Main 48 sqm

Characteristics

Built to fly
Designed to win

Two adjustable foils generate the righting moment, delivering exceptional stability and safety in strong wind conditions.

Top Speed Exceeding
20 Knots

Engineered for peak performance and adrenaline – ideal for ambitious sailors.
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Lifting Keel and
Rudder

With a draft of just 0.5 m, it's easy to transport and perfect for shallow waters.
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Ramp Launch?
No Problem!

Designed for easy launching via slipway – no crane required. Save time, effort, and possibly even that hard-to-get marina berth.
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Trailerable
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Compliant with EU standards (2.55 m wide, 3.5 t): Easily transportable without special permits – for maximum flexibility, whether launching at the marina or exploring remote sailing destinations.

Ready to Race
Built to Stay

Sleeping for 5: A well-thought-out, sporty interior featuring a shower, toilet, and compact galley – perfect for performance-minded sailing families or regatta crews who value comfort after a day at full speed.

Category B
Ready for the Open Sea

CE-certified for offshore adventures, offering exceptional stability and reliable safety – even in challenging conditions.

Only 2.1 metric Tons
Built to Fly

CE-certified for offshore adventures, offering exceptional stability and reliable safety – even in challenging conditions.

Raise the Mast Solo
Quick

Hassle-free setup right from the trailer for maximum freedom and independence.
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Single-Handed Sailing
Made Simple

Developed by experienced solo sailors for intuitive handling and effortless maneuverability – even in challenging conditions.

Sustainable Performance
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An electric propulsion system with built-in hydrogenerator delivers efficient and emission-free energy – for sailing in harmony with nature.

Two Performance Packages

The purist team racing (TR) version with minimal equipment or the luxurious racing (LR) version – with just 200 kg of additional weight. Both variants are built entirely from prepreg carbon, offering maximum performance with ultra-light construction.

About Us

Sailing is my passion – it has shaped my mindset and approach since childhood. For over 25 years, I’ve been steering unconventional ideas into reality with Swissroof GmbH: innovative projects tailored to clients and conditions, developed with top specialists – all the way to successful market launch.

Christoph Müller

The prototype is on track for completion in spring 2026

for pre-order

Sea Trials Kick Off on Swiss Lakes

Initial test sails are taking place in Romanshorn on Lake Constance and on Lake Neuchâtel to fine-tune the final details. After that, you'll have the chance to experience the Seafoiler firsthand.

For autumn 2026, three exclusive trial weeks are planned:
  • Week 1: Saint-Tropez, France
  • Week 2: Barcelona
  • Week 3: Les Sables-d’Olonne
  • Exact dates will be announced in due course.
to get in touch

Be among the first:

The Seafoiler is available for pre-order now. Feel free to get in touch with us for more information.
get in touch

Ruder aluminium mould

CFK Rudder

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