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Swan 51
Designer: German Frers  ·  Builder: Nautor  ·  First built: 1980
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About the Swan 51

Designed by renowned Argentine naval architect German Frers and built by Finland's prestigious Nautor shipyard, this elegant 51-footer represents the pinnacle of 1980s performance cruising design. During its five-year production run from 1980 to 1985, just 36 hulls were constructed, making this a relatively exclusive yacht that has maintained strong desirability among discerning sailors. The Swan 51's sophisticated hull combines traditional Swan aesthetics with Frers' innovative approach to weight distribution and hydrodynamics. Its fin keel with spade rudder configuration delivers exceptional sailing performance, while the masthead sloop rig provides excellent versatility for both coastal and offshore passages. With a displacement of 39,600 pounds and 16,500 pounds of ballast, the boat strikes an ideal balance between stability and speed. The design excels as a serious offshore cruiser capable of spirited performance sailing. Its moderate comfort ratio of 38.03 and favorable capsize screening value of 1.73 indicate a boat well-suited for ocean passages, while the sail area to displacement ratio of 17.86 ensures lively performance in light to moderate conditions. This Swan appeals to experienced sailors seeking a proven bluewater cruiser with racing heritage and timeless Scandinavian craftsmanship.

Core Dimensions
LOA (Length Overall) 51.25 ft / 15.62 m
LWL (Waterline Length) 42.33 ft / 12.90 m
Beam 14.67 ft / 4.47 m
Max Draft 8.90 ft / 2.71 m
Displacement 39,600.00 lb / 17,962 kg
Ballast 16,500.00 lb / 7,484 kg
Ballast Type Lead
Sail Area (Reported) 1,291.00 ft² / 119.94 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer German Frers
Builder Nautor
First Built 1980
Last Built 1985
Number Built 36
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Performance Ratios
PHRF Rating PHRF (Performance Handicap Racing Fleet) is a national racing handicap measured in seconds per nautical mile. Lower values indicate faster boats. Ratings are sourced from US Sailing's national database (median across 60+ regional fleets).
Under 0 — Ultralight racer0–90 — Performance racer90–150 — Cruiser/racer150–210 — Typical cruiserOver 210 — Heavy/slow cruiser
 36
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
 17.86
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
 41.67
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
 233.08
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
 38.03
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. 8.72 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
 2.43
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. 2,218.83 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. 17.85
Rig Dimensions
I (Foretriangle Height) 69.50 ft / 21.18 m
J (Foretriangle Base) 20.90 ft / 6.37 m
P (Mainsail Luff) 62.70 ft / 19.11 m
E (Mainsail Foot) 18.00 ft / 5.49 m
SA Fore 726.28 ft² / 67.47 m²
SA Main 564.30 ft² / 52.43 m²
SA Total (100%) 1,290.58 ft² / 119.90 m²
Est. Forestay Length 72.57 ft / 22.12 m
Engine & Accommodations
Engine Make Perkins
Engine Type Diesel
Horsepower 73
Fuel Capacity 69 gals / 261 L
Water Capacity 184 gals / 697 L
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