FIRST 41 S5 Sail Configuration Guide

Overview

The FIRST 41 S5 is a performance-oriented cruiser designed by Jean Berret, blending refined aesthetics with a fast, capable hull. It targets sailors seeking a balance between spirited club racing and comfortable offshore passage-making.

Rig Specifications & Performance Analysis

• Mainsail Configuration: P/E ratio of 3.09 indicates a high-aspect-ratio rig, prioritizing aerodynamic efficiency and lift.
• Foretriangle Design: I/J ratio of 3.75 is optimized for large overlapping genoas to generate maximum drive.
• Sail Area: 69m² total upwind area provides a powerful ratio for the 12.28m hull.
• Performance: The design is notably weatherly, performing exceptionally well in light to moderate air with its generous sail plan.

Popular Sail Configurations

• Mainsail: Owners typically utilize full-batten configurations to support the 15.43m luff and maintain a clean leach profile.
• Headsail: Most configurations favor a 135% to 145% overlapping genoa to take advantage of the high I/J ratio.

Key Characteristics

• High-aspect-ratio 3.09 P/E rig delivers excellent upwind lift and efficiency.
• Powerful 3.75 I/J foretriangle favors large headsails for superior light-air performance.
• 1.97m draft provides the necessary stability to carry the 69m² sail plan effectively.
• Balanced Berret hull ensures predictable handling and responsiveness in offshore conditions.

Sailing Considerations

• Early reefing is recommended around 16-18 knots to manage the high-aspect mainsail and reduce heel.
• Efficient sail handling requires a coordinated crew of 4-6 for racing, though it remains manageable for couples when cruising.
• Expect high pointing angles and responsive helm feedback, particularly in flat water conditions.

Sailmaking Recommendations

For the FIRST 41 S5, we recommend SurgeX membrane sails as the optimal choice for most sailors. SurgeX uses continuous fiber construction where fibers are laid along load paths and embedded in a thin membrane, providing superior shape retention compared to traditional Dacron while being more affordable than premium laminates. The continuous fiber structure means less stretch over time, maintaining the designed sail shape for years.

For racing applications, specify a lightweight SurgeX configuration with minimal base weight to maximize performance and acceleration. For cruising or bluewater sailing, add a taffeta protective layer on both sides to enhance UV resistance and abrasion protection. Based on the 3.09 P/E ratio, a tri-radial fiber layout works best to handle the vertical loads of this tall rig. A typical inventory includes a full-batten mainsail and a 140% overlapping genoa. With 69m² of sail area, plan to reef around 17 knots to maintain a balanced, neutral helm.

Conclusion

The FIRST 41 S5 remains a standout performance cruiser with a rig that rewards high-quality sail shapes and modern materials. Explore sail options for FIRST 41 S5 to unlock its full Berret-designed potential.