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3Di sailmaking
3Di Sail Series Logo

3Di is a unique, patented sailmaking technology that produces the world’s fastest and most durable sails. 3Di sails mirror the balanced load bearing and shape holding of a rigid airfoil wing. They are composed of ultra-thin unidirectional spread filament tapes, pre-impregnated with thermoset adhesive, arranged in a complex multiple-axis array, and three-dimensionally molded into a one-piece, flexible composite membrane.

A spread filament tape is an individual yarn that has been spread out until the individual filaments lie side-by-side; forming an ultra-thin “tape.” This exclusive technology enables 3Di sails to be made from fiber and adhesive only—without the need for Mylar film.

North’s proprietary automated tape laying system allows designers precise control over the placement and orientation of material within each sail. This unitary, monolithic construction produces an airfoil that has balanced resistance to distortion in all directions. Less distortion = more speed.


3Di ENDURANCE sails are made with the same precision technology as 3Di RAW, but feature a tough surface resin, carried by light non-woven outer tapes to enhance durability. Ideal for high performance offshore racing and global cruising where long-term durability is paramount.

FAST TOUGH VERSATILE

  • 760 – Aramid/UltraPE hybrid sails with 50/50 fiber ratio for optimized modulus and durability
  • 780 – Carbon/Aramid/UltraPE hybrid sails with 70/30 fiber ratio for enhanced shape holding
  • Surface color and weight options available

RAW is 3Di in its purest form. 3Di RAW is constructed with multiple weights and styles of tapes to allow highest possible stiffness to weight ratios - without added exterior surface layers. Made for the highest performance racing requirements including Grand Prix, Americas Cup, Inshore, Offshore and One Design racing.

SPEED WITHOUT COMPROMISE

  • 760 – Aramid/UltraPE hybrid sails with 50/50 fiber ratio for optimized modulus and durability
  • 780 – Carbon/Aramid/UltraPE blended hybrid sails for enhanced shape holding
  • 870 – Carbon/UltraPE hybrid sails for no compromise performance and shape holding

North Sails 3Di RACE is a new purpose-built 3D composite sail. Its dedicated tape layout was developed to best match 3Di technology and properties to smaller boats and lower dpi. The result is a sail with a wider wind range, a more supple feel, and a more user-friendly experience. 3Di RACE can be used optimally in a variety of conditions, and is the most forgiving 3Di style when not perfectly trimmed.

CLUB RACE OPTIMIZED

  • 760 Aramid/UltraPE hybrid sails with balanced tape layout tuned for off-axis strength
  • User friendly steering and trimming
  • Available in both black and gold fiber color

3Di NORDAC is a revolutionary product that reinvents the dacron cruising sail. 3Di NORDAC combines the unique properties of 3Di composite sails with familiar polyester fiber. The result is an innovative cruising sail with smoother and more permanent aerodynamic shape that provides greater control, more comfort and better speed. North has made thousands of 3Di sails that sailed millions of miles.

Strong Smooth Seamless

  • 100% polyester for ultimate durability
  • White color with excellent tear and abrasion resistance
  • One-piece, 3D molded composite construction
  • Variable fiber density and orientation for optimized matching of material to loads
  • Integrated internal batten pockets, corner reinforcements and reef structure
    Inherent UV Toughness