The new way to cross oceans
Nominated for the 2025 DAME Design Awards.
The IFS Multi Tradewind Sail (also nicknamed the Batman Sail by the online community, after a OneSails video of the black prototype recently went viral on the internet) is an evolution of the traditional twin-headsail system, developed to deliver more power and boat speed with furling simplicity, greatly improved efficiency and control in long-distance downwind sailing.
Building on established trade wind concepts, this sail integrates two structured – luff IFS gennakers on a single furling unit, eliminating the need for heavy, stiff and expensive anti-torsion cables. The result is a lighter, more powerful configuration with a significantly larger sail area and improved aerodynamics compared to conventional twin genoas or spinnakers.
Each section of the sail can be deployed independently or together, adapting seamlessly to all downwind angles.
The system uses standard furling and adjustable clew connections, allowing fast and intuitive operation. It reduces the need for complex sail changes, making it an ideal solution—especially, but not only—for ocean crossings and long-distance cruising, where reliability and simplicity are essential.
This sail is suitable for both multihulls and monohulls. On monohulls, the overall width should be designed according to whether or not spinnaker poles will be used.
Both sails open symmetrically to create a stable and efficient “twin-genoa-like” setup for deep downwind sailing, with TWA between 165° and 180°. Unlike traditional twin genoas, however, these sails can be easily furled, taken down, and stowed in a compact, spinnaker-style bag.
Both sails are set on the same side by simply connecting both clews to the same sheet — they function as a gennaker for reaching angles up to 90° TWA, maintaining consistent power and precise airflow.
Its total surface area can be up to 35% larger than that of a symmetric spinnaker, and since this additional area is concentrated in the lower part of the sail, the boat becomes less prone to rolling and nose-diving.
As a result, it delivers greater thrust, improved stability, and reduced overall load on the upper section of the mast.
The sail is also very safe when running, as easing the clew sheets increases twist in the upper luff sections, providing an effective and simple depowering option.
Sail surface areas in the simulation:
Constructed with advanced materials and featuring a structured luff using OneSails’ exclusive Integrated Furling Structure (IFS) technology, the Multi Tradewind Sail combines lightness, strength, versatility, and durability with the refined craftsmanship that defines all OneSails products.
I over 15 år har OneSails-designteamet utviklet eksklusive teknologier for å lage seil i ett stykke med kontinuerlig tråder for tur- og regattabåter.
Egenskaper som vekt, lett å trimme og høy bruddstyrke gir bedre ytelse sammenlignet med tradisjonelle panelseil.
Seilene er designet og produsert i henhold til de strengese krav og består av nøye utvalgte komponenter for å sikre høyeste kvalitet og holdbarhet. 4T FORTE™-membranene er kun laget i Italia. Hele produksjonsprosessen foregår i en spesialfabrikk som sikrer at alle nødvendige standarder oppfylles.
De beste seildesignene er et resultat av kontinuerlig analyse og erfaring. OneSails ligger i forkant i seilmakerbransjen og investerer kontinuerlig i forskning og utvikling for å sikre at vi har de aller beste designene. At denne metoden er vellykket, bevises av det store antallet titler som OneSails sine kunder har vunnet i nasjonale, internasjonale og verdensmesterskap.
En kjerneaktivitet for alle OneSails Loft er å tilby førsteklasses service, støtte og assistanse. Som en del av vår serviceforpliktelse har hvert OneSails Loft et team av eksperter som sørger for at vi kan innfri serviceløftet vårt. I tillegg til et økende antall hovedloft har OneSails Group et omfattende nettverk av servicesentre som er strategisk plassert langs hele verdens kystlinje.
