The Dufour 412 'Grand Large' Sailboat
Specs & Key Performance Indicators

The Dufour 412 'Grand Large', a light displacement fractionally rigged sloop, was designed by Umberto Felci and built in France by Dufour Yachts.

A Dufour 412 'Grand Large' sailboatA Dufour 412 'Grand Large' preparing to drop the hook

Published Specification for the Dufour 412 'Grand Large'

Underwater Profile: Fin keel with spade rudder

Hull Material: GRP

Length Overall: 40'6" (12.4m)

Waterline Length: 36'7" (11.2m)

Beam: 13'8" (4.2m)

Draft: 6'6" (2.0m)

Rig Type: Fractional Sloop

Displacement: 19,709lb (8,940kg)

Designer: Umberto Felci

Builder: Dufour Yachts (France)

Year First Built: 2016

Owners Association: Dufour Owners Association

Published Design Ratios for the Dufour 412 'Grand Large'

1. Sail Area/Displacement Ratio: 16.8

  • Less than 16 would be considered under-powered;
  • 16 to 20 would indicate reasonably good performance;
  • Over 20 suggests relatively high performance.

2. Ballast/Displacement Ratio: 29.1

  • Under 40: less stiff, less powerful
  • Over 40: stiffer, more powerful

3. Displacement/Length Ratio: 180

  • Under 100: Ultralight
  • 100 to 200: Light
  • 200 to 275: Moderate
  • 275 to 350: Heavy
  • Over 350: Ultraheavy

4. Comfort Ratio: 24.5

  • Under 20 indicates a lightweight racing boat
  • 20 to 30 indicates a coastal cruiser
  • 30 to 40 indicates a moderate offshore cruising boat
  • 40 to 50 indicates a heavy offshore boat
  • Over 50 indicates an extremely heavy offshore boat

5. Capsize Screening Formula: 2.0

  • Under 2.0 (the lower the better): Better suited for ocean passages
  • Over 2.0: Less suited for ocean passages

read more about these Key Performance Indicators...

Summary Analysis of the Design Ratios for the Dufour 412 'Grand Large'

1. A Sail Area/Displacement Ratio of 16.8 suggests that the Dufour 412 'Grand Large' will, in the right conditions, approach her maximum hull speed readily and satisfy the sailing performance expectations of most cruising sailors.

2. A Ballast/Displacement Ratio of 29.1 would usually mean that the Dufour 412 'Grand Large' would have a tendency to heel excessively in a gust, and need to be reefed early to keep her sailing upright in a moderate breeze.

However, as she has much of her ballast concentrated in a bulb at the foot of the keel, she's likely to be considerably stiffer than her published Ballast/Displacement Ratio might suggest.

3. A Displacement/Length Ratio of 180, tells us the Dufour 412 'Grand Large' is clearly a light displacement sailboat. If she's loaded with too much heavy cruising gear her performance will suffer dramatically.

4. Ted Brewer's Comfort Ratio of 24.5 suggests that crew comfort of a Dufour 412 'Grand Large' in a seaway is similar to what you would associate with the motion of a coastal cruiser with moderate stability, which is not encouraging news for anyone prone to seasickness. 

5. The Capsize Screening Formula (CSF) of 2.0 is on the cusp of suitability for an ocean passage, so venture offshore with caution.

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