ANDREWS 40 Sail Configuration Guide

Overview

The Andrews 40 is a performance-oriented racer-cruiser designed for speed and technical agility. Built by the renowned Betts yard, this design balances a powerful sail plan with a deep-draft hull for competitive offshore and buoy racing.

Rig Specifications & Performance Analysis

Analysis of the rig dimensions reveals a modern, high-efficiency profile:

• Mainsail Configuration: A P/E ratio of 2.81 indicates a tall, high-aspect rig designed for maximum lift and upwind efficiency.
• Foretriangle Design: The I/J ratio of 3.16 is optimized for high-aspect headsails, favoring efficient jibs over large, overlapping genoas.
• Sail Area: 75m² of total upwind sail area provides a high power-to-displacement ratio.
• Performance: The combination of a 2.73m draft and tall rig makes the Andrews 40 exceptionally weatherly and close-winded.

Popular Sail Configurations

• Mainsail: Usually configured with a significant roach or square-top to utilize the tall P dimension.
• Headsail: Most owners utilize high-aspect non-overlapping jibs (J1-J3) for versatile performance across wind ranges.

Key Characteristics

• High-Aspect Power: The 2.81 P/E ratio delivers superior lift-to-drag ratios upwind.
• Efficiency: The 3.16 I/J ratio supports modern, high-tension jib configurations.
• Stability: A 2.73m draft provides the necessary righting moment for the 75m² sail plan.
• Performance Pedigree: Betts construction ensures a stiff, lightweight platform for high-load sail plans.

Sailing Considerations

The Andrews 40 is a responsive platform that requires precise trim to optimize its high-aspect foils. It remains stiff in moderate breeze but benefits from early depowering of the mainsail as the apparent wind builds. Typical crew requirements lean toward an experienced racing team for offshore success.

Sailmaking Recommendations

For the ANDREWS 40, 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 to maximize performance and minimize weight aloft. For cruising or performance deliveries, add a taffeta protective layer on both sides to enhance UV resistance and abrasion protection. Based on the 2.81 P/E ratio, a tri-radial fiber layout works best to manage the high vertical loads on the leech. A typical inventory includes a high-roach mainsail and a versatile Code 0 for light air reaching. With 75m² of sail area, plan to reef around 20 knots to maintain optimal heel angles.

Conclusion

The Andrews 40 is a sophisticated design that excels when paired with high-modulus, stable sail shapes. Explore sail options for ANDREWS 40 to maximize your yacht's speed and longevity.