Downwind sail

for racing sailboatsfor sailing yachtspolyester

Overview
Structured Luff Downwind is a downwind sail combining a structured leading-edge lens with a conventional soft trailing section. It was developed to provide reliable downwind operations while improving performance at narrow apparent wind angles typical of modern Grand Prix and Maxi-class race yachts.

MIKE SANDERSON SHARES THE DEVELOPMENT –
“I had been scratching my head trying to figure out how to transition into a narrower apparent wind type of sail without losing the conventional abilities to do string drops, peels, standard gybes, regular packing and so on.” The resulting concept places a Structured Luff lens at the leading edge that progressively morphs into a soft sail toward the leech, preserving standard handling techniques.

THE STRUCTURED LUFF EVOLUTION
The design uses a structural Stratis material in the forward section transitioning to off-the-shelf polyester further aft, delivering a more balanced load distribution across the sail. This approach addresses the performance gap when yachts sail at apparent wind angles around 50–55° where traditional nylon or polyester-only spinnakers can struggle.

Caractéristiques / spécifications techniques

• Concept: Structured Luff lens on the leading edge that morphs into a conventional soft sail toward the trailing edge.
• Operations: Designed to retain conventional downwind handling — string drops, peels, standard gybes and regular packing.
• Target use: Grand Prix and Maxi-class race yachts sailing at narrow apparent wind angles (~50–55°).
• Materials: Structural Stratis material in the forward section transitioning to polyester in the trailing section.
• Performance: More balanced load distribution and improved versatility across a wider range of downwind angles.
• First presented at: Sorrento IMA Maxi European Championship (May).