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Sea Eagle 31
Designer: Stan Huntingford  ·  Builder: C&L Marine Corp.(Taiwan)  ·  First built: 1979
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About the Sea Eagle 31

Built between 1979 and 1982 by C&L Marine Corp. in Taiwan, this Stan Huntingford design represents a well-balanced approach to coastal cruising and club racing from the early 1980s. The masthead sloop configuration and moderate dimensions create a versatile platform that appeals to sailors seeking both performance and comfort in a manageable size. The Sea Eagle 31's fin keel with rudder on skeg arrangement provides good directional stability while maintaining reasonable maneuverability in close quarters. Its fiberglass hull with Airex core construction and balsa deck core reflects the advanced composite techniques becoming popular during its production era, offering strength while keeping weight reasonable. With a displacement of 12,500 pounds and ballast of 5,125 pounds, the design strikes a solid balance between stability and performance. The boat's comfort ratio of 30.3 suggests reasonably quick motion in seaways, while the capsize screening formula of 1.78 indicates good stability characteristics suitable for coastal and near-offshore sailing. The SA/Displacement ratio of 14.55 points to moderate performance potential, making this an appealing choice for weekend coastal cruising with occasional club racing aspirations. The standard 20-horsepower auxiliary provides adequate backup propulsion for its size and displacement.

Core Dimensions
LOA (Length Overall) 31.00 ft / 9.45 m
LWL (Waterline Length) 27.33 ft / 8.33 m
Beam 10.33 ft / 3.15 m
Max Draft 4.75 ft / 1.45 m
Displacement 12,500.00 lb / 5,670 kg
Ballast 5,125.00 lb / 2,325 kg
Sail Area (Reported) 488.00 ft² / 45.34 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG Airex hull/ balsa deck
Designer Stan Huntingford
Builder C&L Marine Corp.(TAIWAN)
First Built 1979
Last Built 1982
Owner Reviews

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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
 14.55
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
 41
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
 273.37
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
 30.3
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
 1.78
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. 7.01 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
 1.74
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. 1,008.76 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. 14.54
Rig Dimensions
I (Foretriangle Height) 39.50 ft / 12.04 m
J (Foretriangle Base) 13.50 ft / 4.11 m
P (Mainsail Luff) 34.00 ft / 10.36 m
E (Mainsail Foot) 13.00 ft / 3.96 m
SA Fore 266.63 ft² / 24.77 m²
SA Main 221.00 ft² / 20.53 m²
SA Total (100%) 487.63 ft² / 45.30 m²
Est. Forestay Length 41.74 ft / 12.72 m
Engine & Accommodations
Engine Make Yanmar
Engine Type Diesel
Horsepower 20
Fuel Capacity 35 gals / 132 L
Water Capacity 65 gals / 246 L
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