KER 46 Sail Configuration Guide

Overview

The KER 46, designed by Jason Ker and built by McConaghy, is a high-performance racing yacht optimized for competitive offshore and coastal circuits. Its design philosophy prioritizes speed, aerodynamic efficiency, and technical precision for a demanding racing market.

Rig Specifications & Performance Analysis

• Mainsail Configuration: A P/E ratio of 3.22 indicates a high-aspect rig designed for maximum lift and efficiency upwind.
• Foretriangle Design: The I/J ratio of 3.48 is perfectly suited for modern high-aspect working jibs rather than large overlapping genoas.
• Sail Area: 103m² total upwind area provides a high power-to-weight ratio.
• Performance: The rig and deep 3.28m draft confirm a dedicated racing orientation with exceptional close-windedness.

Popular Sail Configurations

• Mainsail: Typically features a square-top configuration to capitalize on the tall P/E ratio and increase effective sail area.
• Headsail: Primarily utilizes a range of non-overlapping jibs (J1-J4) to maintain high-aspect efficiency across varying wind speeds.

Key Characteristics

• High-aspect mainsail design (P/E 3.22) for superior aerodynamic lift.
• Optimized for non-overlapping headsails (I/J 3.48) facilitating fast tacks.
• Significant righting moment and tracking from the 3.28m deep draft.
• Professional-grade composite construction suited for high rig loads.

Sailing Considerations

• Requires a skilled crew to manage high-aspect sail trim and aggressive maneuvers.
• Exceptional performance in light-to-medium air with 103m² of upwind area.
• Responsive handling that rewards precise sail shaping and heel angle control.

Sailmaking Recommendations

For the KER 46, 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 Carbon or Technora fibers and minimal base weight to maximize performance. For offshore racing or delivery legs, add a taffeta protective layer on both sides to enhance UV resistance and abrasion protection. Based on the 3.22 P/E ratio, a multi-directional fiber layout works best to handle the high vertical loads of this high-aspect rig. A typical inventory includes a square-top mainsail, a J2 all-purpose jib, and a code zero for reaching. With 103m² of sail area, plan to reef or depower around 18-20 knots of true wind.

Conclusion

The KER 46 is a specialized racing platform that demands high-modulus sail materials to match its high-aspect rig efficiency. Explore SurgeX membrane sail options for the KER 46 to maximize your competitive edge.