DUBOIS 50 Sail Configuration Guide

Overview

The DUBOIS 50 is a high-performance cruiser-racer designed by the renowned Dubois Naval Architects. Featuring a deep 3.30m draft and a generous sail plan, it is engineered for sailors seeking offshore speed and precision handling in competitive fleets.

Rig Specifications & Performance Analysis

• Mainsail Configuration: A P/E ratio of 3.04 indicates a high-aspect ratio rig, providing efficient lift and vertical power distribution.
• Foretriangle Design: The I/J ratio of 3.45 is optimized for high-aspect headsails, allowing for tight sheeting angles and superior upwind pointing.
• Sail Area: 123m² total upwind area provides a high power-to-weight ratio for light to moderate air performance.
• Performance: The combination of a tall rig and a deep 3.30m keel makes this a stiff, weatherly yacht capable of maintaining high speeds in offshore conditions.

Popular Sail Configurations

• Mainsail: Typically a full-battened configuration to support the high-aspect 20.14m luff and maintain leach tension.
• Headsail: Most owners utilize non-overlapping or slightly overlapping performance jibs to maximize the efficiency of the I/J ratio.

Key Characteristics

• High-aspect rig (P/E 3.04) designed for maximum aerodynamic efficiency.
• Efficient foretriangle (I/J 3.45) optimized for close-winded performance.
• Deep 3.30m draft ensures exceptional stability and resistance to leeway.
• 123m² upwind sail area delivers competitive performance in varied sea states.

Sailing Considerations

• Recommended for experienced crews due to the powerful rig and high-aspect sail plan.
• The deep draft requires careful coastal navigation but offers unmatched stiffness in a breeze.
• Performs best with active backstay and car adjustments to flatten sails as the apparent wind increases.

Sailmaking Recommendations

For the DUBOIS 50, 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 carbon laminates. The continuous fiber structure means less stretch over time, maintaining the designed sail shape across the high-aspect 20.14m mainsail luff.

For racing applications, specify a lightweight SurgeX configuration with a Technora or Carbon fiber blend and minimal base weight to maximize acceleration. For cruising or bluewater sailing, add a taffeta protective layer on both sides to enhance UV resistance and abrasion protection against the rig. Based on the 3.04 P/E ratio, a multi-directional membrane layout works best to handle the high vertical loads. A typical inventory includes a 67m² mainsail and a 56m² high-aspect jib. With 123m² of sail area, plan to take the first reef around 18–20 knots to maintain an upright, efficient trim.

Conclusion

The DUBOIS 50 is a pedigree performance yacht that thrives with high-modulus sail materials. Explore sail options for DUBOIS 50 to maximize its 123m² potential.