SYDNEY 39 Sail Configuration Guide

Overview

The SYDNEY 39, designed by Burns/Murray/Dovel, is a high-performance cruiser-racer built for competitive offshore racing and fast coastal passages. Its design philosophy balances a powerful rig with a deep-draft hull for sailors who prioritize speed and handling.

Rig Specifications & Performance Analysis

An analysis of the SYDNEY 39 rig dimensions reveals a focus on aerodynamic efficiency:

• Mainsail Configuration: A P/E ratio of 2.80 indicates a high-aspect rig designed for maximum lift and efficient upwind pointing.
• Foretriangle Design: The I/J ratio of 3.53 is optimized for tall, powerful headsails that provide significant drive in light to moderate air.
• Sail Area: With 78m² of total upwind sail area, the boat is well-powered for its 11.79m length.
• Performance: The combination of a high-aspect sail plan and a deep 2.60m draft makes this vessel exceptionally weatherly and stiff.

Popular Sail Configurations

Due to the versatile nature of the SYDNEY 39, setups vary based on use:

• Mainsail: Usually configured as a full-battened high-performance sail to maintain the high-aspect profile.
• Headsail: Often features a range of non-overlapping jibs or specialized reaching sails depending on the racing rating system used.

Key Characteristics

• High-aspect main (2.80 P/E) for superior lift and reduced drag.
• Tall foretriangle (3.53 I/J) allowing for efficient high-modulus headsails.
• Deep 2.60m draft providing excellent stability and righting moment.
• Large 78m² upwind area ensuring competitive performance across wind ranges.

Sailing Considerations

• Requires precise trim and active backstay adjustment to manage the high-aspect rig.
• Generally requires a crew of 6-8 for fully crewed racing, though the layout allows for fast shorthanded cruising.
• Performance expectations include high pointing angles and rapid acceleration in puffs.

Sailmaking Recommendations

For the SYDNEY 39, we recommend SurgeX membrane sails as the optimal choice. SurgeX utilizes continuous fiber construction where fibers are laid along specific load paths and vacuum-embedded in a thin membrane. This provides superior shape retention compared to traditional Dacron and standard laminates while remaining cost-effective. The continuous fiber structure ensures that the designed airfoil shape remains stable over a much wider wind range.

For racing applications, specify a lightweight SurgeX configuration with high-modulus fibers and a film/film finish to minimize weight aloft. For cruising or offshore work, we recommend adding a lightweight taffeta protective layer to both sides to enhance UV resistance and prevent abrasion. Given the 2.80 P/E ratio, a tri-radial fiber orientation within the membrane is essential to handle the vertical loads on the luff. A standard high-performance inventory includes a high-roach mainsail and a 105% LP jib. With 78m² of sail area, the SYDNEY 39 typically requires a first reef around 18-20 knots of true wind.

Conclusion

The SYDNEY 39 is a sophisticated performance platform that truly excels with modern, high-modulus sail shapes. Explore SurgeX membrane sail options for the SYDNEY 39 to maximize your upwind efficiency and durability.