Stratis GPc
Performance Cruising Sails

Doyle Stratis GPc
Doyle Stratis GPc
Doyle Stratis GPc
Doyle Stratis GPc
Doyle Stratis GPc
Doyle Stratis GPc

Competition-level performance with trouble-free cruising durability

Powerful performance with better shape retention, higher strength and greater durability.

Stratis GPC performance cruising sails have been developed to deliver the rugged durability required of cruising sails that are folded or furled while maintaining many of the performance benefits of racing sails.

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Cruising sails with unsurpassed performance

Stratis™ pre-impregnated fiber technology provides unmatched flexibility in fiber orientation, accuracy of placement and superior lamination. All fibers are load bearing, converging to every load point, producing stronger, lighter sails that are much smoother when set, hold their shape better with significantly less stretch, and last longer than conventional sails.

Ultimate durability

External polyester taffetas provide excellent durability and improve the flex properties of the laminate and protect fibers from abrasion and UV damage. Taffetas can be incorporated on one of both sides of the sail.

UV protection

Stratis™ laminates using either clear UV absorbing films of Ti02 coated taffetas with UV absorbers provide much greater protection from UV than standard PET film laminates.

Distortion-free reef dynamics

Advanced technology enables full load path fiber layouts to be mapped to each reef point on both mainsails and furling headsails. The increased stability of the fibre-aligned membrane shakes out to a smooth, distortion free sail, even after being reefed for long periods.

Advances over conventional sails

Sails fabricated in the conventional method by cutting and placing many separate panels, can only approximate the different load paths of a sail. Stratis™ fibre- aligned sails have fibres mapped directly along all load paths. Every fibre is load bearing, making a stronger, lighter and more durable sail.

Roller furling sails

Stratis™ rollboom mainsails and roller furling headsails are custom designed with fibres laid for loads generated when the sail is furled. In conventional furling sails the uneven thickness of large reefing patches on the leech inhibits smooth furling. Stratis™ eliminates this problem, enabling smooth furling with a series of reefing position.


Each Stratis™ sail is custom designed and custom manufactured in-house by Doyle Sailmakers

  • Shape dynamics are designed in 3 dimensions for smooth shape transitions
  • Load paths are calculated and mapped to the performance specifications of each sail, ensuring accurate weight calculations and optimized lamination.
  • Sections are laminated flat before shipping. Extremely high pressures ensure delaminating will not occur under sail.
  • Technora, Carbon or Vectran yarn options. Technora provides stretch resistance with a higher modulus and much better flex properties than Kevlar, making it an ideal fiber for cruising applications.
  • Anti-microbial coatings plus Ti02 coatings incorporated in taffeta surfaces.
  • Stratis™ sails are 15% - 30% lighter than conventional panel sails.
  • Color options available.

Stratis™ laminates using Technora / Carbon / Vectran yarns, lightweight taffetas and UV absorbing films are the ultimate performance cruising sails.

Technora mixes well with Carbon fiber and adds significant durability to a carbon fiber sail. The carbon is used in GPc membranes primarily as the significant load bearing fibres while the Technora, because of its resistance to strength loss created by flex, adds durability to the membrane. This application is perfect for highly loaded sails such as large cruising yachts and superyachts.

Primary Fibers utilized for performance cruising applications


Technora is a gold or black colored fibre originally developed to replace steel belting in tires. It is a very durable fibre and is resistant to breakdown from either flex or UV. Technora has low stretch characteristics but does not out perform carbon or Kevlar in this field. It is particularly suitable for combining with Carbon or Twaron in a sail to increase durability.

Technora is a useful fibre for Stratis GPc as it works well in synergistic combinations with carbon fibre, where the membrane must go the extra mile. It’s one of our favorites for offshore racing applications.


Polyester is naturally a white fibre but it is also available in dyed black. It is the fibre that is used in the various forms of Dacron in a woven form as well as in cruising laminates produced by sailcloth manufacturing companies. Polyester is a cost effective and relatively stretchy fibre which helps to keep the loads on sheets and attachment points down due to the elasticity in the sail.

The use of polyester in a Stratis GPc sail is particularly suitable for small to mid size cruising sails. The shape holding advantage that using polyester as a laminate gives over a panel sail construction is substantial over a wide wind range with the additional performance benefits from specifically engineered reef points. Polyester fibres provide performance and durability as a cost effective option to cruise laminates commonly used for performance cruising sails.


Vectran (Liquid Crystal Polymer) is a light brown fibre with significantly lower stretch characteristics than Polyester, but many other similar properties. The fibre copes well with flexing so it is especially suitable for performance cruising sails. Vectran however does not have good UV resistance so it should always be specified in conjunction with polyester taffetas on the outside surfaces of the sail to provide protection from UV.

Vectran is suitable for mid to large cruising sails where performance and light weight are desirable.

Carbon Fiber:

Carbon fiber is a black fibre which has the highest strength and lowest stretch of all of the fibres we use. Carbon is used where light weight and low stretch are essential for sail performance. Carbon is often combined with other fibres in the laminate for added durability.

The modulus and tensile strength of carbon fibre used in Stratis membranes exceeds that of all the other fibres but comes at a price with the brittle nature of the material resulting in far lower resistance to flex fatigue. It is however virtually impervious to UV degradation, and when used appropriately it is a very useful fibre for medium to large cruising yachts and superyachts which have boom-furling mainsails that limit the bend radius of the fibres while in storage.

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