SCHOCK 40 Sail Configuration Guide

Overview

The SCHOCK 40 is a high-performance racer designed by Dyna Yachts, featuring advanced technologies like the Canting Ballast Twin Dagger (CBTF) system. This boat is primarily targeted at the competitive racing market and performance-oriented sailors seeking a fast, weatherly platform.

Rig Specifications & Performance Analysis

• Mainsail Configuration: A P/E ratio of 2.50 indicates a high-aspect rig, designed to generate efficient lift and minimize drag.
• Foretriangle Design: The I/J ratio of 3.17 is relatively high, optimized for high-aspect working jibs and powerful headsails.
• Sail Area: With 63m² of upwind sail area on a 12.20m hull, the boat possesses a high power-to-weight ratio.
• Performance: The narrow beam and deep 2.51m draft suggest a boat that excels in upwind performance and stability.

Popular Sail Configurations

• Mainsail: Large, high-aspect mainsails, often featuring full battens to support the tall P dimension.
• Headsail: Primarily non-overlapping or slightly overlapping jibs to suit the narrow sheeting angles.

Key Characteristics

• High-Aspect Power: The 2.50 P/E ratio allows for a tall, efficient sail plan that maximizes lift.
• Foretriangle Efficiency: An I/J ratio of 3.17 favors powerful, easy-to-tack headsails.
• Sleek Hull Profile: The 3.04m beam combined with a 12.20m LOA creates a fast, low-drag hull shape.
• Weatherly Performance: Designed for superior close-hauled performance and high pointing stability.

Sailing Considerations

• Best performance is achieved in light to moderate air where the high-aspect rig shines.
• Requires a skilled crew to manage the canting keel system and high-tension rig loads.
• High-performance potential requires precise sail trim to maintain optimal heel angles.

Sailmaking Recommendations

For the SCHOCK 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 carbon laminates. The continuous fiber structure ensures minimal stretch over time, maintaining the designed aerodynamic profile for several seasons of hard racing.

For racing applications, specify a lightweight SurgeX configuration with a Technora or Aramid fiber map and minimal base weight to maximize acceleration. For performance cruising or delivery legs, add a lightweight taffeta protective layer on both sides to enhance UV resistance and prevent abrasion. Given the 2.50 P/E ratio, a tri-radial fiber layout works best to handle the vertical loads of the tall luff. A typical inventory includes a square-top mainsail, a versatile J2 jib, and an asymmetric spinnaker. With 63m² of sail area, plan to reef the mainsail around 18-20 knots to maintain control.

Conclusion

The SCHOCK 40's tall rig and innovative hull design make it a standout performer in the 40-foot racing category. Explore SurgeX membrane sail options for the SCHOCK 40 to unlock its full speed potential.