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. 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

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.

Top Speed Exceeding
20 Knots

Engineered for peak performance and adrenaline – ideal for ambitious sailors.

.

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
.

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 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 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

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.

Saloon

Galley

Toilet

Master Cabin

Aft Cabin

Shower

Pricing

Day Test Sail

CHF 1000.-

What’s included:

Experienced skipper – relaxed vibes, expert guidance
At the end: tasty snacks & cool drinks on board
Up to two persons
Hands-on sailing – try it yourself or just enjoy the ride

And the best part? Your test sail fee goes right off the purchase price if you decide to buy!

sign up now

team racer (TR)

Contact us for pricing

Performance Package:

Full carbon prepreg lightweight construction
Two high-performance C- foils with trim actuators
Full carbon rig
Twin rudder system
Lifting keel
1 day of introduction and training included
24-month warranty on hull, foils, and rudders

sign up now

luxurious racer (LR)

Contact us for pricing

Luxery Package:

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

Interior surfaces in full carbon, wood, or felt finish

sign up now

Rewards for Offshore Racers

Are you a professional sailor planning to enter offshore races with a Seafoiler? We support your ambition – with cash prizes for the first three podium finishes. Your performance deserves more than applause.

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

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: Genoa, Italy
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

How it Works

Size can be bought. Speed must be earned.

Introducing the Seafoiler -35-

Characteristics

2 adjustable Foils

Lifting keels with 700 kg bulb

14.89m MAST carbon, 2 Spreaders

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

Built to fly
Designed to win

Top Speed Exceeding
20 Knots

Lifting Keel and
Rudder

Ramp Launch?
No Problem!

Trailerable
.

Ready to Race
Built to Stay

Category B
Ready for the Open Sea

Only 1.9 metric Tons
Built to Fly

Raise the Mast Solo
Quick

Single-Handed Sailing
Made Simple

Sustainable Performance
.

Standing Room – Freedom to Move Upright
.

Two Performance Packages

Pricing

CHF 1000.-

Contact us for pricing

Contact us for pricing

Rewards for Offshore Racers

About Us

The prototype is on track for completion in spring 2026

Sea Trials Kick Off on Swiss Lakes

Be among the first:

Ruder aluminium mould

CFK Rudder

Size can be bought. Speed must be earned.

Introducing the Seafoiler -35-

Characteristics

2 adjustable Foils

Lifting keels with 700 kg bulb

14.89m MAST carbon, 2 Spreaders

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

Built to fly Designed to win

Top Speed Exceeding 20 Knots

Lifting Keel and Rudder

Ramp Launch? No Problem!

Trailerable .transparent-text { color: transparent; } .

Ready to RaceBuilt to Stay

Category BReady for the Open Sea

Only 1.9 metric TonsBuilt to Fly

Raise the Mast SoloQuick

Single-Handed SailingMade Simple

Sustainable Performance .transparent-text { color: transparent; } .

Standing Room – Freedom to Move Upright .

Two Performance Packages

Pricing

CHF 1000.-

Contact us for pricing

Contact us for pricing

Rewards for Offshore Racers

About Us

The prototype is on track for completion in spring 2026

Sea Trials Kick Off on Swiss Lakes

Be among the first:

Ruder aluminium mould

CFK Rudder

Lifting keels with 700 kg bulb

Built to fly
Designed to win

Top Speed Exceeding
20 Knots

Lifting Keel and
Rudder

Ramp Launch?
No Problem!

Trailerable
.

Ready to Race
Built to Stay

Category B
Ready for the Open Sea

Only 1.9 metric Tons
Built to Fly

Raise the Mast Solo
Quick

Single-Handed Sailing
Made Simple

Sustainable Performance
.

Standing Room – Freedom to Move Upright
.