1D - One Design Sails

02/09/2026

Catamaran sailmaking is one of the highest levels of sailmaking.
The margin for error is incredibly small.

High-performance catamarans are fast, highly loaded and extremely sensitive to changes in sail shape, rig setup and trim. Nothing works in isolation: sail, mast, rig, platform, foils, crew and the way the boat is sailed all influence each other.
That is what makes designing and building catamaran sails so demanding.

A sail has to deliver the intended flying shape under real loads, while the mast bends and rotates, the platform deforms under load and the apparent wind changes rapidly with boat speed.
And experience teaches you something important:
not every millimetre matters equally.
The real skill is knowing which ones do.

That knowledge comes from years of designing, building, measuring, testing, racing and modifying, then validating whether the change actually made the boat faster.
F16, F18, A-Class and Tornado have been a major part of this development at 1D Sails for more than a decade.

We have tested that knowledge at World Championships.
Catamaran sailmaking teaches you to understand the whole system, not just the sail.

And that knowledge goes into every sail we build.

13/08/2026

Karlsson/Nordblom (SWE007) did it again at the Stockholm Archipelago Raid! Congratulations!!!

Huge congratulations also go to the third-place duo, Viktor Silén and Anssi Muikku (FIN14)!

https://www.facebook.com/stockholmarchipelagoraid/posts/pfbid02yQDuDv1oZ1ZvaVzYhFKocKcjZGJwoCmHJw2S5b7LRCP1ddjUeb2os7bpYMGGYopUl

Karlsson Nordblom did it again 2026-08-12 f18sweden.se 4 teams fought until the finish line in the last race to get on the podium. It was full racing until the finish line on the last leg. Karlsson/ Nordblom (SWE) did it again with a total score of 121 points! And 3 teams came in on 117 points, bu....

09/07/2026

Moments of Formula 18 Europeans 2026 at lago di Como

11/06/2026

Great sails are not born from one idea.
They are built through development, testing, simulation, sailor feedback and real racing pressure.
This is why we are looking back at some of the key moments behind the 1D F18 Pro line, not for nostalgia, but because today’s sails are built on everything we have learned on the racecourse.

More in comment

01/06/2026

Foiling a-cat with Emil Järudd
📸 Guppypix - Gordon Upton

01/06/2026

27/05/2026

Our sweet F16 boys were so young back then 😄
2017 feels like yesterday… and look where they are now.
Still collecting titles together!
French F16 Champions again 🇫🇷🏆

Emmanuel Le Chapelier and Eric Le Bouëdec at the F16 French Nationa...

27/05/2026

Another trophy for Manu Le Chapelier and Éric Le Bouëdec in the F16 class! This time at the French Championship, in what seems to have been one of the biggest F16 fleets ever.

For us, national championship victories matter a lot. These events bring together strong fleets, different sailing styles, changing conditions, and real pressure. A national title is not won in a perfect test environment, but on the racecourse, against sailors who know the class, know the boats, and know how to push hard.

That is exactly why results like this are so valuable for us: feedback and confirmation.
They show that the work behind the design, the materials, the cut, the details and the continuous development is going in the right direction.

We are proud to see 1D sails winning not only at international events, but also in strong national championships where consistency, speed and control matter race after race.

Congratulations to Manu and Éric, French F16 Champions.
Thank you for keeping our sails at the front of the fleet, since 2015!

1D - One Design Sails
Proven on the racecourse.

🏆 Vainqueur du National F16 2026 🥇🚀

Magnifique National F16 à Sévrier sur le Lac d’Annecy avec 23 équipages venus de toute l’Europe: Suède 🇸🇪, Hollande 🇳🇱, Suisse 🇨🇭 et Belgique 🇧🇪.

2ème Yohan Debauque & Denis Calvet 🇧🇪 🇫🇷
3ème Anna Kroon & Matthijs Spijk 🇳🇱

BeFoil Befoil
1D - One Design Sails
Forward WIP
Cercle Nautique du Ferret
Eric Le Bouëdec

THEIX INOX Diffusion
AFU

Cercle de voile Sevrier

21/05/2026

PROVEN. SHARP. RELENTLESS.

Great sails are not built from one result. They are built over seasons: through development, testing, racing, feedback, long conversations, small changes and constant refinement.
That is why we are looking back at some of the key moments behind the Formula 18 sails of 1D. Not for nostalgia, but because today’s 1D F18 sails are built on everything we have learned on the racecourse.

After 2018, we knew we had something strong, but we also knew one very important thing: it was not finished. A winning sail does not make us stop. It makes us ask better questions.
So we went straight back into development with new ideas for the mainsail, new thoughts on the jib, a new generation of gennaker, and even more testing, feedback and conversations with sailors.

In 2019, the 1D F18 concept proved something that really mattered: it was not a one-boat success.
At the Formula 18 World Championship in Spain, 1D sails were visible across the fleet. More than half of the fleet had at least one 1D sail, several teams raced with full 1D sets, and six boats finished in the top 10 with 1D sails.
Dani and Kostas, the previous World Champions, finished second. The Argentinian team finished third, and that event became the beginning of a long and special relationship between 1D and the Argentinian F18 sailors.
But for us, the real story of 2019 was not only the result list. It was the feedback.

Darren Bundock was racing with Connor James Nicolas and using 1D Sails for the first time. Later, when we talked about that event, he said something we never forgot: he liked the jib, and he could understand the mainsail very clearly.
That matters, because an F18 sail should not only be fast on paper. It has to be fast in the hands of real sailors. You need to feel what it wants, understand how to trim it, and make it work when the fleet is tight, the pressure is high, and there is no time for guessing.

That year shaped one of the most important ideas behind our Formula 18 sails: the goal is not only to design the fastest possible sail. The goal is to design the fastest possible sail in a way that makes its speed easier to access.
Because in the end, sails are not used by computers. They are used by sailors.

So when you choose your next F18 sail, choose one that has been proven across sailors, platforms and conditions. A sail that has been tested, refined and already delivered.

1D’s F18 sails are not just designed to be fast. They are proven fast — across the fleet.
This is the second chapter of the story behind our F18 sails.
Looking for your next Formula 18 sail set? Talk to us and choose the sailmaker with proven F18 performance.