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North Sails - 3Di Technology

3Di™ is a unique, patented sailmaking technology that produces the world’s fastest and most durable sails.

3Di sails mimic 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.

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