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.
Over de sidste 15 år har OneSails’ designteam udviklet eksklusive teknologier for at gøre et fuldstøbt kontinuerlig sejl til virkelighed for cruise- og racingbåde.
Funktioner som vægt, formkontrol og deformationmodstand betyder bedre ydeevne sammenlignet med traditionelle panelsejl.
Sejlene er designet og fremstillet efter de højeste standarder med omhyggeligt udvalgte komponenter for at sikre den højeste kvalitet og holdbarhed. 4T FORTE™ membraner fremstilles eksklusivt i Italien. Hele samlingsprocessen foregår på én unik fabrik, der sikrer, at alle krav og standarder overholdes.
De bedste sejl faconer er et resultatet af kontinuerlig analyse og erfaring. OneSails er i spidsen for sejlfremstillings industrien og investerer løbende i forskning og udvikling for at sikre, at de allerbedste sejl faconer er tilgængelige. Succesen med denne tilgang bekræftes af det store antal trofæer, som OneSails-kunder har vundet ved nationale, internationale og verdensmesterskaber.
En kerneaktivitet for hvert OneSails Loft er at levere førsteklasses service, support og assistance. Som en del af vores serviceforpligtelse har hvert OneSails Loft et team af eksperter til rådighed for at sikre, at vi kan leve op til vores serviceløfte. Ud over et voksende antal hovedlofter har OneSails Group et omfattende netværk af servicecentre, der er strategisk placeret langs hele verdens kystlinje.
