Race Series 780 Cuben Fiber
Super light, super-strong upwind radial paneled sails

Cuben Fiber is a proprietary laminated sailcloth manufactured by North Cloth in which fiber that is originally manufactured as a yarn (many small filaments bundled together in a larger thread) is spread out to form a flat tape of side-by-side filaments. The tapes are then laminated to either Polyester film for downwind sails or Fluoride FC films when used for upwind sails. Cuben Fiber tapes are typically produced from Dyneema or a Spectra equivalent, but are sometimes made using carbon and aramid blends. The Cuben Fiber laminate is autoclaved to ensure that it’s extremely well consolidated and as light as possible.

Because the fiber tapes can be laid up in varying directions, Cuben Fiber allows North sail designers to design very light and easily pressurized radial paneled sails with enough strength to handle higher upwind sail loads.

Product Highlights
  • High performance filament tape construction
  • North's highest-performance radial paneled sail
  • Laminated using high-strength Fluoride FC outer films

Which upwind sail is right for you?
All Upwind Sails Page ►
Upwind Sail Performance Guide ►



The Cuben Fiber laminate
consists of filament tapes
(Dyneema, aramid or carbon
yarn spread flattened out into a
single filament layer) x between outer layers of polyester or
fluoride film. The essential
filament tapes are oriented at a
90-degree angle with optional
plies in intermediate directions.
Race Series 780 Mainsails and Headsails
  • Cuben fiber sailcoth
  • Radial paneled layout with vertical shaping for mainsails and genoas
  • Loose-footed main for with Integral Foot Skirt for shape and control
  • Luff customized to mast/boom or headstay system (except for custom luff cars)
  • Teardrop reinforcing patches
  • Stainless steel round rings (Titanium if loads indicate a better fit) and Rutgerson press rings
  • RBS epoxy “E-glass” battens
  • Pockets with 3Di tie in closure
  • Cunningham adjustment on mainsails
  • Pre-stretched Dyneema leechline and footline
  • Telltales
  • Drawstring sailbag
Race Series 780 Mainsail Options
  • Higher roach profiles through added area
  • Reefs
  • Water Reef
  • Reef keepers and flaking handles
  • Custom reinforcements
  • Overhead leech cord
  • Full length battens
  • Leech battens
  • RBS Carbon leech battens
  • Flutter battens
  • RBS Carbon full length battens
  • Sail numbers
  • Country code
  • Insignia
  • Trim stripes/Glow Fast stripes
  • Photo and corner codes
  • Certified measurement
  • Custom, roll or zippered sausage bag
Race Series 780 Headsail Options
  • Telltale window
  • Leech, Full or VB+ Vertical battens in any quantity or combination
  • Customized patches, pads and reinforcements
  • Spreader and stanchion patches
  • Soft hanks
  • Soft clew
  • North Clewboard
  • T-ring clew
  • Adjustable head loop
  • Tack Snap Shackle
  • Sail numbers
  • Country code
  • Trim stripes/Glow Fast stripes
  • Photo and corner codes
  • Certified measurement
  • UV protection
  • Custom, roll or zippered sausage bag
Race Series 780
  • Radial paneled
    construction
  • Made with super
    strong, super
    light Cuben Fiber
    laminates