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The Dufour 40e, a light-displacement fractional sloop, was designed by Umberto Felci and Patrick Roséo and built in France by Dufour Yachts.
Underwater Profile: Bulb fin keel and spade rudder
Hull Material: GRP
Length Overall: 40'5" (12.4m)
Waterline Length: 35'3" (10.8m)
Beam: 12'9" (3.9m)
Draft: 6'10" (2.1m)
Rig Type: Fractional sloop
Displacement: 16,283lb (7,386kg)
Designer: Umberto Felci and Patrick Roséo
Builder: Dufour Yachts (France)
Year First Built: 2002
Owners Association: Dufour Owners Association
1. Sail Area/Displacement Ratio: 23.8
2. Ballast/Displacement Ratio: 30.0
3. Displacement/Length Ratio: 178
4. Comfort Ratio: 24.7
5. Capsize Screening Formula: 2.0
1. A Sail Area/Displacement Ratio of 23.8 suggests that, in the right hands, the Dufour 40e will have enough performance to leave most other sailboats of similar waterline length well astern.
2. A Ballast/Displacement Ratio of 30.0 would usually mean that the Dufour 40e 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 178, tells us the Dufour 40e 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 24.7 suggests that crew comfort of a Dufour 40e 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 indicates that a Dufour 40e would not be the wisest choice of sailboat for ocean passage-making owing to the lower resistance to capsize in strong winds and heavy seas that is associated with sailboats with a CSF of 2.0 and above.
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