PETERSON 37 Sail Configuration Guide

Overview

Designed by the legendary Doug Peterson and built by Kiwi, the PETERSON 37 is a high-performance cruiser-racer balancing IOR-era heritage with offshore capability. This vessel is primarily targeted at competitive club racers and offshore cruisers who prioritize speed and weatherly performance.

Rig Specifications & Performance Analysis

Analysis of the PETERSON 37 rig dimensions reveals a balanced and powerful sail plan:

• Mainsail Configuration: A P/E ratio of 3.00 indicates a high-aspect ratio mainsail rig, providing excellent lift and efficiency when sailing close-hauled.
• Foretriangle Design: The I/J ratio of 3.15 is optimized for large overlapping genoas, characteristic of its design era, allowing for significant power in light to moderate air.
• Sail Area: With 60m² of total upwind sail area (26m² main / 33m² headsail), the boat maintains a competitive power-to-displacement ratio.
• Performance: The rig is designed for versatility, excelling in upwind pointing while remaining manageable for short-handed cruising.

Popular Sail Configurations

Due to the versatile nature of the PETERSON 37, sail inventories vary based on use case:

• Mainsail: Owners typically utilize full-batten configurations for cruising or high-modulus racing mainsails with fine-tuned draft control.
• Headsail: Most setups feature a 135-150% overlapping genoa for light air, transitioning to a non-overlapping working jib as the breeze builds.

Key Characteristics

• High-Aspect Efficiency: The 3.00 P/E ratio ensures the mainsail provides maximum lift with minimal drag.
• Genoa Dominant: The 3.15 I/J ratio suggests the primary driving force comes from the large foretriangle area.
• Stable Platform: A 3.63m beam provides the necessary righting moment to carry the 60m² sail plan effectively.
• Weatherly Performance: Designed for superior upwind angles and stiff performance in a breeze.

Sailing Considerations

The PETERSON 37 is a close-winded vessel that rewards precise trim. Given the large headsail area, active winch work is required during tacks. The boat remains stiff in most conditions, but with 60m² of sail, the high-aspect rig often requires a first reef in the mainsail when true wind speeds exceed 18-20 knots to maintain optimal heel angles.

Sailmaking Recommendations

For the PETERSON 37, we recommend SurgeX membrane sails as the optimal choice. SurgeX utilizes continuous fiber construction where high-modulus fibers are laid along specific load paths and embedded in a thin membrane. This provides superior shape retention compared to traditional Dacron while remaining significantly more cost-effective than premium carbon laminates. The continuous fiber structure ensures the sail resists stretching over time, maintaining the intended aerodynamic profile for years of service.

For racing applications, a lightweight SurgeX configuration with a technora or aramid fiber map is ideal for minimizing aloft weight and maximizing acceleration. For cruising or bluewater use, we recommend adding a taffeta protective layer on both sides to enhance UV resistance and prevent abrasion. Given the 3.00 P/E ratio, a tri-radial fiber layout within the membrane works best to handle the vertical loads of the high-aspect main. A standard inventory should include a SurgeX mainsail and a 140% All-Purpose Genoa. With 60m² of total area, ensure the mainsail includes at least two reef points for offshore safety.

Conclusion

The PETERSON 37 remains a premier example of Doug Peterson's talent for balancing speed and sea-kindliness. Explore sail options for PETERSON 37 to unlock its full performance potential.