SUN FAST 3600 Sail Configuration Guide

Overview

The Sun Fast 3600 is a high-performance racing yacht designed by Andrieu and built by Jeanneau, specifically optimized for shorthanded offshore racing and competitive club fleets. Its design philosophy balances aggressive speed with the stability required for short-handed maneuvers.

Rig Specifications & Performance Analysis

Analysis of the P/E/I/J dimensions reveals a modern, efficient sail plan:

• Mainsail Configuration: A P/E ratio of 2.93 indicates a high-aspect ratio rig, prioritizing vertical lift and efficiency in upwind modes.
• Foretriangle Design: The I/J ratio of 3.47 is highly optimized for high-aspect, non-overlapping jibs, allowing for tight sheeting angles and ease of handling.
• Sail Area: With a total upwind area of 62m², the vessel maintains a competitive power-to-displacement ratio.
• Performance: The rig is strictly performance-oriented, designed to maximize VMG (Velocity Made Good) in a wide range of sea states.

Popular Sail Configurations

While configurations vary across the 10-boat fleet, modern setups prioritize versatility:

• Mainsail: High-aspect designs, often utilizing square-top configurations to maximize the 13.58m luff length.
• Headsail: Primarily non-overlapping jibs (J1 to J3) that take advantage of the 14.61m foretriangle height for maximum drive.

Key Characteristics

• High-Aspect Efficiency: The 2.93 P/E ratio ensures a powerful mainsail with minimal drag.
• Optimized Foretriangle: An I/J ratio of 3.47 supports high-tension, low-stretch headsails for superior pointing.
• Stability and Power: The 2.15m draft and 3.56m beam provide the leverage needed to carry 62m² of sail efficiently.
• Shorthanded Capability: The rig dimensions are tailored for manageable sail changes and reefing by minimal crew.

Sailing Considerations

The Sun Fast 3600 is a stiff, weatherly boat that rewards precise trim. Because of its generous 62m² sail plan, the boat is highly responsive in light air but requires proactive depowering as the breeze builds. Typical crews find the boat remains balanced and controllable even when pushed in offshore conditions.

Sailmaking Recommendations

For the SUN FAST 3600, 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 and reduce aloft weight. For cruising or heavy offshore use, add a taffeta protective layer on both sides to enhance UV resistance and abrasion protection. Based on the 2.93 P/E ratio, a tri-radial fiber layout within the membrane works best to handle the high vertical loads. A typical inventory includes a square-top mainsail, a versatile J2 jib, and a code sail. With 62m² of sail area, plan to reef around 18-20 knots to maintain optimal heel and rudder authority.

Conclusion

The Sun Fast 3600 is a masterclass in modern rig design, offering a perfect platform for high-aspect membrane sails. Explore sail options for SUN FAST 3600 to unlock its full podium potential.