B/ONE Sail Configuration Guide

Overview

The B/ONE is a modern sportboat designed by Farr Yacht Design for Bavaria, prioritizing high-performance one-design racing and agile daysailing. It targets sailors seeking a responsive, trailerable platform that balances speed with manageable handling characteristics.

Rig Specifications & Performance Analysis

• Mainsail Configuration: A P/E ratio of 2.51 indicates a high-aspect rig, favoring aerodynamic efficiency and powerful upwind performance.
• Foretriangle Design: The I/J ratio of 3.38 is optimized for high-aspect, non-overlapping working jibs that ensure ease of tacking.
• Sail Area: 27m² total upwind area provides a high power-to-weight ratio for a 7.08m hull.
• Performance: The combination of a deep 1.66m draft and a Farr-designed rig ensures a stiff, weatherly boat capable of high pointing angles.

Popular Sail Configurations

• Mainsail: Configurations typically feature a high-roach or square-top profile to maximize the efficiency of the tall P dimension.
• Headsail: Most setups utilize high-aspect jibs, often with vertical battens to support the leech within the narrow foretriangle.

Key Characteristics

• High-Aspect Power: The 2.51 P/E ratio delivers excellent lift-to-drag efficiency in the mainsail.
• Optimized Foretriangle: A 3.38 I/J ratio favors modern, easily handled headsails over large genoas.
• Exceptional Stability: The 1.66m draft provides the leverage needed to carry 27m² of sail area effectively.
• Responsive Handling: Designed for agility, the rig and hull dimensions favor active trimming and athletic sailing.

Sailing Considerations

• The B/ONE is sensitive to weight distribution and performs best when kept flat with active mainsheet and backstay tension.
• Typical crew requirements are 3-4 for competitive racing, though the layout allows for short-handed daysailing.
• Performance expectations include early planing downwind and high responsiveness in light-to-moderate breeze.

Sailmaking Recommendations

For the B/ONE, we recommend SurgeX membrane sails as the optimal choice for most sailors. SurgeX uses continuous fiber construction where fibers are laid precisely 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 significantly less stretch over time, maintaining the designed sail shape for years of competitive use.

For racing applications, specify a lightweight SurgeX configuration with minimal base weight to maximize performance and sensitivity. For cruising or intensive daysailing, add a taffeta protective layer on both sides to enhance UV resistance and abrasion protection against the spreaders. Based on the 2.51 P/E ratio, a custom fiber map designed for high-aspect loads is essential to prevent leech stretch. A typical inventory includes a high-roach mainsail and a cross-cut or radial-reinforced jib. With 27m² of sail area on a light hull, plan to reef or depower via the backstay around 18 knots.

Conclusion

The B/ONE’s Farr-designed rig offers a potent balance of power and precision for the modern sportboat enthusiast. Explore sail options for B/ONE to unlock its full upwind and downwind potential.