MIURA Sail Configuration Guide

Overview

The MIURA, designed by Berkemeyer and built by NEBE, is a versatile 9.33m performance cruiser known for its seaworthiness and balanced handling. With a small, dedicated fleet, it serves as a capable platform for both competitive club racing and spirited coastal cruising.

Rig Specifications & Performance Analysis

• Mainsail Configuration: A P/E ratio of 3.20 indicates a high-aspect ratio rig, favoring efficient upwind lift and performance.
• Foretriangle Design: The I/J ratio of 2.98 suits large overlapping genoas, providing significant power in light to moderate air.
• Sail Area: 39m² total upwind area offers a healthy power-to-weight ratio for a boat of this displacement.
• Performance: The configuration suggests a weatherly, close-winded vessel that rewards precise trim and sail shape control.

Popular Sail Configurations

• Mainsail: Owners typically utilize full-battened configurations to support the high-aspect P/E ratio and maintain leech stability.
• Headsail: Common setups include 135% to 150% genoas for light-air performance, or 100% working jibs for heavy-weather stability.

Key Characteristics

• High-aspect 3.20 P/E ratio offers superior lift-to-drag characteristics for upwind efficiency.
• Versatile 2.98 I/J ratio allows for powerful, overlapping headsail configurations.
• Deep 1.79m draft provides the necessary righting moment for the 39m² sail plan.
• Moderate 3.15m beam ensures a stiff and stable platform under varied sea conditions.

Sailing Considerations

• The MIURA is notably close-winded but requires proactive reefing to manage the high-aspect mainsail.
• Ideally handled by a crew of 3-5 for racing, while remaining manageable for a couple when cruising.
• Expect predictable tracking and excellent stability when properly balanced.

Sailmaking Recommendations

For the MIURA, 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. For cruising or bluewater sailing, add a taffeta protective layer on both sides to enhance UV resistance and abrasion protection. Based on the 3.20 P/E ratio, a tri-radial fiber layout works best to manage the high vertical loads. A typical inventory includes a cross-cut or tri-radial 140% Genoa and a semi-battened Mainsail. With 39m² of sail area, plan to reef around 18-20 knots to maintain a flat heel angle.

Conclusion

The MIURA’s high-aspect rig and robust Berkemeyer design make it a rewarding boat to sail with a modern membrane inventory. Explore sail options for MIURA to unlock its full performance potential.