The sail type, boat, cloth and intended use settle the construction. You choose the parts that depend on how you sail; the sailmaker turns those choices into the production specification.
This page explains the principles shared across all five sail types. The sail-specific guides remain the authority for the details that differ between a mainsail, headsail, Code Zero, gennaker and spinnaker.
Start with the material and load path
Sailcloth does not carry load equally in every direction. Cross-cut and radial sails orient each panel so the cloth’s strongest direction follows the loads running from the body of the sail to its corners. Membrane sails place continuous fibres along those load paths instead.
The cloth choice therefore affects more than the sail’s surface. It also sets the valid panel layout, seam construction, corner transitions, edge tapes, reinforcement and handling requirements. See Sailcloth and Panel Layout & Load Paths.
Seams and edges
Panel seams transfer load and, on a shaped panelled sail, help create the designed three-dimensional form. Stitch type, thread, overlap and row count follow from the material, sail area and expected load rather than being owner choices.
The three edges do different jobs. The luff and foot carry attachment loads into the sail, while the leech must remain stable without becoming unnecessarily heavy. Luff tapes, slides, cars, bolt ropes, leech lines and foot lines are therefore specified with the sail type and the hardware already fitted to the boat.
Corners and reinforcement
The head, tack and clew collect the loads from the whole sail into small attachment areas. Their patch geometry, webbing, rings and other fittings scale with the sail’s area, cloth, geometry and intended use.
More material is not automatically better. Reinforcement must spread the load into the body of the sail without creating a hard, heavy transition that distorts the surrounding cloth.
Battens and pockets
Battens support roach and control the local sail section. A short batten pocket, a full-batten receptacle and a vertical batten for an in-mast furling sail solve different problems and cannot share one generic finish.
The sail-specific guides explain the available layouts and the boat interfaces they require:
Hardware must match the boat
Rings, headboards, webbing, luff tapes, slides, cars, furler connections and cable terminations are interfaces, not decoration. The correct fitting depends on both the sail load and what is already on the boat.
This is why photographs and equipment models matter during configuration and Sailmaker Review. The configurator can propose a valid starting point; the completed interface specification still has to agree with the actual mast, boom, furler, track, deck fitting or handling system.
Standard and Heavy-Duty
Standard is the normal construction for the completed sail specification. It is already graded for the sail’s type, area, cloth and intended use.
Heavy-Duty builds the same sail more heavily where its working life justifies it. Depending on the sail, that can mean heavier cloth, additional reinforcement, wider tapes, heavier stitching or hardware, and more chafe or UV protection.
Heavy-Duty is not a certification or a general quality upgrade. The extra material adds weight and bulk, so it is most useful for long passages, harder service, heavy weather or long intervals between professional servicing. The sail-specific Usage and Build Standard pages explain when that trade-off makes sense.
What you decide
You provide the facts about the boat and choose the intended use, Build Standard, cloth direction, handling options, reefs, protection and appearance where those choices are available.
Thread gauge, stitch rows, tape widths, patch layers, fibre density, panel details and hardware sizing are production specifications. They follow from the completed sail rather than being arbitrary configurator choices, and are confirmed during Sailmaker Review.
What remains sail-specific
Construction cannot be separated from the sail’s job. Continue with the guide for the sail you are buying: