DEHLER 39 Sail Configuration Guide

Overview

The DEHLER 39, designed by Judel/Vrolijk, is a premier performance cruiser-racer built for sailors who demand speed without sacrificing offshore comfort. Its design philosophy balances a powerful rig with a stiff, weatherly hull, making it a favorite for both club racing and fast blue-water cruising.

Rig Specifications & Performance Analysis

• Mainsail Configuration: A P/E ratio of 2.74 indicates a high-aspect ratio rig, optimized for efficiency and lift during upwind beats.
• Foretriangle Design: The I/J ratio of 3.52 is relatively high, providing a tall, narrow foretriangle that suits powerful non-overlapping jibs or large reaching genoas.
• Sail Area: 76m² total upwind area provides an excellent power-to-displacement ratio.
• Performance: The configuration favors close-hauled performance and quick acceleration in light-to-moderate air.

Popular Sail Configurations

• Mainsail: Typically configured as a fully-battened sail to maintain the 41m² profile and increase the longevity of the sail's shape.
• Headsail: Most owners utilize a 105% to 110% jib for versatility, though larger genoas are common in lighter wind regions.

Key Characteristics

• High-aspect rig (P/E 2.74) for superior aerodynamic efficiency and pointing.
• Tall foretriangle (I/J 3.52) allows for high-performance headsail configurations.
• Balanced 11.79m hull ensures stability and predictable handling in heavy weather.
• Versatile 76m² total area provides a wide competitive range in various handicap rules.

Sailing Considerations

• The DEHLER 39 remains stiff and controllable, typically requiring reefing of the 41m² mainsail as true wind speeds approach 18-20 knots.
• Crew requirements vary from a full racing team of 6-8 to a capable cruising couple due to the balanced helm.
• Expect exceptional performance in mid-range conditions where the J/V hull design minimizes drag.

Sailmaking Recommendations

For the DEHLER 39, 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 2.74 P/E ratio, a radial load-path layout works best to handle the vertical loads of the high-aspect rig. A typical inventory includes a 41m² mainsail and a 35m² all-purpose jib. With 76m² of total sail area, plan to reef at approximately 19 knots to maintain optimal heel angles.

Conclusion

The DEHLER 39's rig and hull dimensions create a fast, weatherly platform that responds exceptionally well to modern sail technologies. Explore sail options for DEHLER 39 to maximize your yacht's potential.