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SOLD - 4/8/2022 This 1980 Dufour 31, built in France, she was innovative design for her time, with a clipper bow, fin-bulb keel, and skeg-rudder, she is fast, points high and is very maneuverable and just looks good! Her interior has a spacious, six-berth interior including a quarter berth with locking door, a dinette double and 6Ft 3in headroom. Her headliner is fiberglass and looks like-new.
Equipment: The galley has a three burner stove with oven and runs on LPG. She has a fold-down chart table/map storage. The head is amidships. The powerful masthead rig gives cruising performance. This boat has a reliable Volvo Penta MD11c 23hp Marine Diesel Engine - last extensively serviced in 2015, with good compression, which starts easily in cold weather, has a 10 gal stainless steel fuel tank last cleaned out in 2015. She has older and very soft 150 genoa (perfect for light winds), like-new working jib and full jib replaced in 2004 along with the full main, replaced in 2000 which is still good condition. Her standing rigging and lifelines were professionally replaced in 2004. Running rigging has been sporadically replaced and is in good working condition. Brand-new deep cranking batteries and seven AC electric shore power outlets. She is in the water and ready to sail at the Napa Valley Marina, her slip is transferable.
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
SA/D = SA ÷ (D ÷ 64)2/3
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Ballast / Displacement * 100
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
CSV = Beam ÷ ³√(D / 64)
Not to be confused with the DUFOUR 3800 AKA DUFOUR 31 FRERS (1980).
Tall Rig-
I: 41.20’
J: 11.97’
P: 36.90’
E: 10.20’
Shallow draft: 4.75’
One owner reports Volvo MD2B as original engine.
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