The Dufour 2800 Sailboat
Specs & Key Performance Indicators

Published Specification for the Dufour 2800

Keel & Rudder Configuration: Fin keel & spade rudder.
Hull Material: GRP (Fibreglass).
Length Overall: 27'1" (8.3m)*.
Waterline Length: 22'2" (6.8m)*.
Beam: 9'7" (2.9m)*.
Draft: 4'10" (1.5m)*.
Rig Type: Masthead sloop.
Displacement: 6,064lb (2,751kg)*.
Ballast: 1,984lb (900kg)*.
Sail Area: 325 ft² (30.2 m²)*.
Designer: Michel Dufour.
Builder: Dufour Yachts (France).
Year First Built: 1977.
Year Last Built: 1984.
Number Built: Approximately 1,300.

* Used to derive the design ratios referred to later in this article - here's how they're calculated...

Options & Alternatives

Deep Draft Version: This model featured a fin keel with a draft of 5'0" (1.52m). 

Shoal Draft Version: The shoal draft variant had a shallower keel, with a draft of 3'11" (1.2m) to 4'3" (1.3m). 

Dufour 2800CS (Club Special): This was a higher-performance variant with a deeper fin keel, optimized rigging, and a slightly lighter displacement for improved speed and handling.

Sail Areas & Rig Dimensions

Sail Areas & Rig Dimensions

Sail Areas:

• Mainsail: Approximately 12.5 m² (135 ft²).
• Genoa: Around 17.7 m² (190 ft²).
• Total Sail Area: 30.2 m² (325 ft²).

Rig Dimensions:

• I (Fore triangle height): 32'10" (10m)
• J (Fore triangle base): 10'11" (3.32m)
• P (Mainsail luff length): 28'1" (8.55m)
• E (Mainsail foot length): 9'6" (2.9m)

Published Design Ratios
The Key Performance Indicators (KPIs)

• Sail Area/Displacement Ratio (15.7): This suggests that the Dufour 2800 requires a moderate breeze to perform optimally. In light winds, it may struggle to generate enough power from its sails, making motor-sailing a practical option in calm conditions.

• Ballast/Displacement Ratio (32.7): This indicates that the boat benefits from early reefing in moderate winds to maintain stability. Without a bulb keel to enhance stiffness, the boat may heel significantly if overpowered.

• Displacement/Length Ratio (249): This classifies the Dufour 2800 as a moderate displacement cruiser, meaning it can carry cruising gear without drastically affecting performance. It is well-suited for coastal cruising rather than high-speed racing.

• Comfort Ratio (20.0): This suggests that the boat’s motion in a seaway is moderate, making it comfortable for coastal cruising but potentially less stable in rough offshore conditions. Crew members prone to seasickness may find its motion challenging in heavy seas.

• Capsize Screening Formula (2.1): This indicates that the Dufour 2800 is not ideal for ocean passage-making, as it has a higher risk of capsize in strong winds and heavy seas compared to boats with a CSF below 2.0.

But the Design Ratios are Not the Whole Story...

• Simplified Assumptions: Design ratios rely on basic mathematical formulas that assume ideal conditions. They don’t account for real-world variables like hull shape, rigging adjustments, or crew experience.

• Static Measurements: Ratios like Displacement/Length (D/L) and Sail Area/Displacement (SA/D) are based on static measurements. They don’t reflect how a boat performs dynamically in different wind and sea conditions.

• Ignoring Hull Design: A boat’s hull shape significantly affects performance, but design ratios don’t capture details like keel type, wetted surface area, or wave resistance—all crucial for speed and handling.

• Overlooking Sail Trim & Rigging: Ratios assume a standard sail plan, but real-world performance depends on sail trim, reefing, mast tuning, and rigging adjustments—factors that ratios don’t measure.

• Comfort & Motion: The Comfort Ratio estimates motion at sea, but it doesn’t account for crew experience, hull flexibility, or damping effects, which influence how comfortable a boat feels in rough conditions.

• Manufacturer Variability: Some manufacturers inflate sail area or underestimate displacement to make their boats seem faster or more stable. This can lead to misleading comparisons between models.

• No Consideration for Load & Gear: Ratios are often calculated for a boat in lightship condition (without gear, fuel, or provisions). A fully loaded cruising boat may perform very differently than its design ratios suggest.

While design ratios provide a general guide, they should be used alongside real-world testing, sailing experience, and expert reviews to fully understand a boat’s capabilities.

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