TARTAN 37 Sail Configuration Guide

Overview

The TARTAN 37, designed by Sparkman & Stephens, is a classic performance cruiser built for offshore capability and refined handling. This S&S design balances a seaworthy hull with a versatile masthead rig suited for both club racing and coastal cruising.

Rig Specifications & Performance Analysis

• Mainsail Configuration: A P/E ratio of 3.46 indicates a high-aspect mainsail design, providing efficient lift and easier handling.
• Foretriangle Design: The I/J ratio of 2.93 supports powerful overlapping genoas, characteristic of its design era.
• Sail Area: 58 m² total upwind area delivers a balanced power-to-weight ratio for mid-range conditions.
• Performance: The deep 2.08m draft and S&S lines ensure excellent upwind tracking and stability in a blow.

Popular Sail Configurations

• Mainsail: Typically configured with two or three reef points for offshore versatility and heavy-air control.
• Headsail: Most owners utilize a 135% or 150% genoa to capitalize on the large foretriangle for light-air performance.

Key Characteristics

• High-aspect mainsail provides efficient aerodynamic lift and easy trim control.
• Large foretriangle favors powerful overlapping headsails for superior light-wind drive.
• 2.08m draft offers exceptional stiffness and close-winded performance.
• 11.31m LOA combined with a 3.55m beam ensures a stable, sea-kindly platform.

Sailing Considerations

• The TARTAN 37 is a stiff, weatherly boat that excels in 12–22 knots of breeze.
• Small crews can manage the rig easily, though large genoas require proper winching technique during tacks.
• Performance is predictable with a well-balanced helm across the wind spectrum.

Sailmaking Recommendations

For the TARTAN 37, 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 bluewater sailing, add a taffeta protective layer on both sides to enhance UV resistance and abrasion protection. Based on the 3.46 P/E ratio, a tri-radial fiber layout works best to handle the vertical loads of the high-aspect main. A typical inventory includes a full-batten mainsail and a 140% Furling Genoa. With 58m² of sail area, plan to reef the mainsail around 18 knots to maintain optimal heel and boat speed.

Conclusion

The TARTAN 37 remains a premier example of S&S design, offering a robust rig that rewards high-quality sail shapes. Explore sail options for TARTAN 37 to unlock its full performance potential.