FIRST 21.7 Sail Configuration Guide

Overview

The FIRST 21.7 is a versatile pocket cruiser-racer designed by Jean Marie Finot for Beneteau, targeting the competitive club racing and coastal cruising markets. Its design philosophy emphasizes a high power-to-weight ratio and trailering convenience without sacrificing stability.

Rig Specifications & Performance Analysis

Analysis of the FIRST 21.7 rig dimensions reveals a modern, efficient sail plan:

• Mainsail Configuration: A P/E ratio of 2.91 indicates a high-aspect ratio rig, optimized for aerodynamic efficiency and windward performance.
• Foretriangle Design: The I/J ratio of 3.54 is relatively high, favoring tall, high-aspect headsails that provide significant drive while remaining easy to tack.
• Sail Area: 22m² total upwind area provides ample power for a hull of this displacement.
• Performance: The configuration leans toward a weatherly, responsive character suited for tactical racing and spirited day sailing.

Popular Sail Configurations

Typical setups focus on versatility across various wind ranges:

• Mainsail: Usually configured as a full-battened or semi-full-battened sail to support the high-aspect leech.
• Headsail: Most owners utilize a 100-105% furling jib for ease of handling, though racing fleets often opt for specialized overlapping genoas.

Key Characteristics

• High-Aspect Rig: The 2.91 P/E ratio delivers superior lift and reduced drag on upwind legs.
• Tall Foretriangle: The 3.54 I/J ratio supports powerful headsails that maximize the boat's close-windedness.
• Stable Platform: A 2.47m beam provides the necessary form stability to carry the 22m² sail plan effectively.
• Finot Design Pedigree: Known for balanced handling and excellent off-the-wind planing potential.

Sailing Considerations

The FIRST 21.7 is a stiff and responsive boat, but its tall rig requires proactive sail trim. It is easily managed by a crew of two for racing, while the simplified control lines allow for effortless single-handed cruising. Expect the boat to reach its hull speed quickly in moderate breezes.

Sailmaking Recommendations

For the FIRST 21.7, 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 in light to moderate air. For cruising or coastal adventuring, add a taffeta protective layer on both sides to enhance UV resistance and abrasion protection against the rig. Based on the 2.91 P/E ratio, a tri-radial panel layout or full membrane construction works best to manage the vertical loads. A typical inventory includes a high-aspect mainsail and a versatile furling jib. With 22m² of sail area, plan to reef the mainsail around 16 knots to maintain optimal heel and steerage.

Conclusion

The FIRST 21.7 features a well-balanced, high-aspect rig that rewards precise sail trim and quality materials. Explore sail options for the FIRST 21.7 to maximize its racing and cruising potential.