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Dynamique 80
Designer: Joubert/Nivelt  ·  Builder: Dynamique - Dufour Sparks (Fra)  ·  First built: 1985
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About the Dynamique 80

Designed by the renowned French duo Joubert/Nivelt and built by Dynamique-Dufour Sparks, this impressive 80-footer represents serious blue-water cruising capability from the mid-1980s. The collaboration between these respected naval architects and the established French builder resulted in a yacht that balances performance with comfort for extended offshore passages. The substantial displacement of 76,000 pounds paired with a fin keel and bulb configuration provides excellent stability and tracking in challenging conditions. Her cutter rig offers versatility in sail handling, particularly valuable during long-distance cruising when crew size may be limited. The generous sail area delivers respectable performance while maintaining manageable proportions for a yacht of this size. With a comfort ratio of 36.08, this yacht prioritizes seaworthiness and motion comfort over pure speed, making her well-suited for serious cruising couples or small crews planning extended voyages. The capsize screening formula of 1.73 indicates good stability characteristics for offshore work, while the substantial beam provides ample interior volume for comfortable long-term living aboard. This design represents the era when French builders were establishing their reputation for creating robust, well-balanced cruising yachts capable of handling demanding ocean passages with style and security.

Core Dimensions
LOA (Length Overall) 80.00 ft / 24.38 m
LWL (Waterline Length) 63.00 ft / 19.20 m
Beam 18.25 ft / 5.56 m
Max Draft 10.00 ft / 3.05 m
Displacement 76,000.00 lb / 34,473 kg
Sail Area (Reported) 3,900.00 ft² / 362.32 m²
Design & Construction
Hull Type Fin w/bulb & spade rudder
Rigging Type Cutter
Construction FG
Designer Joubert/Nivelt
Builder Dynamique - Dufour Sparks (FRA)
First Built 1985
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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
34.94
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
135.69
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
36.08
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
1.73
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 10.64 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
4.19
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 4,108.18 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 21.12
Rig Dimensions
I (Foretriangle Height) 85.25 ft / 25.98 m
J (Foretriangle Base) 32.17 ft / 9.81 m
P (Mainsail Luff) 77.08 ft / 23.49 m
E (Mainsail Foot) 25.58 ft / 7.80 m
SA Fore 1,371.25 ft² / 127.39 m²
SA Main 985.85 ft² / 91.59 m²
SA Total (100%) 2,357.10 ft² / 218.98 m²
Est. Forestay Length 91.12 ft / 27.77 m
Engine & Accommodations
Engine Type Diesel
Fuel Capacity 606 gals / 2,294 L
Water Capacity 808 gals / 3,059 L
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