Size can be bought. Speed must be earned.

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. It represents a new benchmark for anyone searching for a next-generation hydrofoil boat for sale that blends speed, stability, and innovation.

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.

For sailors exploring competitive options like hydrofoil racing sail boats or offshore-performance vessels, the Seafoiler -35- introduces a new category of precision-built speed. It is designed specifically for both competitive offshore racers seeking podium results and adventurous sailors looking for high-performance coastal cruising.

Mechanical Features:

The Seafoiler -35- features a lifting keel and twin rudders for precise handling and stability, and its mast can be stepped single-handedly, allowing effortless solo setup. Its lightweight design of just 1.9 t displacement makes it ideal for slipway launches without a crane, while still supporting an onboard hydrogenerator for sustainable energy.

Characteristics

o	Length Overall	10.5M
o	Beam overall	3M
o	Displacement	TR 1695 kg/ LR 1980Kg
o	Ballast	700 kg
o	Air Draught Max	16.55 M
o	Draught Min / Max	0.5 M / 2.5 M
o	Energie Capacity	7-14 KWH
o	Max. engine power	8 KW
o	Mainsail	48 sqm
o	Jib	31 sqm
o	Code 0	63 sqm
o	Asymetric Spinaker	116 sqm
0	CE Certification	B4 / C6

2 adjustable Foils

each, 1,6sqm, Tilt angle infinitely adjustable up to 7 degrees

Lifting keels with 700 kg bulb

Draught, down 2.5m up 0.5m

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. Ideal qualities for anyone seeking racer sailing foiling capabilities or considering to buy hydrofoil boat models engineered for maximum lift.

Top Speed Exceeding
20 Knots

Top Speed Exceeding 20 Knots Engineered for peak performance and adrenaline – ideal for ambitious sailors looking for racing sailboats or offshore-capable craft with cutting-edge hydrodynamics.

.

Lifting Keel and
Rudder

With a draft of just 0.5 m, it's easy to transport and perfect for shallow waters.

.

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.

.

Trailerable & Ramp Launch
.

With a draft of just 0.5 m, the Seafoiler is easy to transport and perfect for shallow waters. Its design allows slipway launch without a crane, making it highly flexible for marinas or remote locations.

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.

CE Category- Ready for the Open Sea

The Seafoiler -35- is CE certified for categories B4 (offshore) and C6 (coastal), ensuring it can handle both offshore conditions with winds up to 33 knots and coastal adventures with moderate wind and waves.

Only 1.9 Metric Tons – Built to Fly

Every gram engineered for lift, speed, and precision. No excess, just pure performance.

Raise the Mast Solo – Quick

Hassle-free setup right from the trailer for maximum freedom and independence.

.

Single-Handed Sailing Made Simple

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

Sustainable Performance
.

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

Standing Room – Freedom to Move Upright
.

More headroom. Less constraint. All flow.

Two Performance Packages

Whether you seek a purist racing configuration or a refined luxury setup, both versions reflect the precision craftsmanship expected from a luxury sailing yacht manufacturer.

Saloon

Galley

Toilet

Master Cabin

Aft Cabin

Shower

Pricing

Day Test Sail

CHF 1000.-

What’s included:

Experienced skipper
Snacks and drinks
Up to two persons
Hands-on sailing

Your test sail fee will be deducted from the purchase price if you decide to proceed. Ideal for sailors evaluating premium hydrofoil sailing boat Switzerland innovations like the Seafoiler.

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team racer (TR)

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Performance Package includes:

Full carbon prepreg lightweight construction
Two high-performance C- foils with trim actuators
Full carbon rig
Twin rudder system
Lifting keel
1 day introduction/training
24-month warranty

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luxurious racer (LR)

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Luxury Package includes:

Performance Package
Master Cabin
Galley with refrigerator and stove
After Cabin
Electric toilet with warm water shower
Saloon
Deck shower

Interior finishes in carbon, wood, or felt

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Rewards for Offshore Racers

Professional sailors entering offshore races with a Seafoiler can earn cash prizes for podium finishes, offering a unique advantage among modern offshore sailing boats.

pricing

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

About US

Prototype on Track

The prototype is on schedule 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. After that, you’ll have the chance to experience the Seafoiler firsthand.

Exclusive trial weeks planned for Autumn 2026:

Week 1: Genoa, Italy
Week 2: Barcelona
Week 3: Les Sables-d’Olonne
Dates to be announced.

FAQs

What makes the Seafoiler -35- different from other racing sailboats for sale?

The Seafoiler -35- is a hydrofoil racing sailboat designed for peak speed and stability. Unlike traditional sailboats, it uses adjustable foils to lift the hull, delivering unmatched performance and safety even in strong winds.

Can I buy a hydrofoil boat if I’m new to foiling?

Absolutely. The Seafoiler -35- offers intuitive handling for single-handed or team sailing. Test sails and training are included. The boat’s design allows solo mast stepping and effortless foil control, ideal for beginners and experienced sailors alike.

Is the Seafoiler suitable for offshore sailing?

Yes. With its CE B4/C6 certification and robust offshore design, the Seafoiler offers safety and stability in challenging conditions.

How easy is it to transport a Seafoiler -35-?

With its trailerable design and a draft of just 0.5 m, the Seafoiler is easy to launch from a slipway or transport to different locations. No crane is required, making it highly practical for both coastal and remote sailing.

What interior features does the luxurious racing version include?

The LR version offers a master cabin, galley, aft cabin, electric toilet, and warm-water shower, all built in ultra-light carbon construction, blending comfort with racer sailing foiling capabilities.

Where can I test sail the Seafoiler before buying?

Test sails take place on Swiss lakes and selected international locations, including Genoa, Barcelona, and Les Sables-d'Olonne.

to get in touch

Be among the first:

The Seafoiler is available for pre-order now.

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How it Works

Size can be bought. Speed must be earned.

Introducing the Seafoiler -35-

Mechanical Features: