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Dolphin 24 Yankee
Designer: Sparkman & Stephens  ·  Builder: Yankee Yachts Inc. (Usa)  ·  First built: 1968
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About the Dolphin 24 Yankee

Designed by the prestigious Sparkman & Stephens naval architecture firm, this classic 24-footer represents solid craftsmanship from the golden age of fiberglass sailboat construction. Built by Yankee Yachts beginning in 1968, the Dolphin 24 Yankee earned a reputation as a capable small cruiser with surprisingly good sailing characteristics for her size. The masthead sloop rig and generous sail area of 295 square feet provide spirited performance, while the deep 5.16-foot draft and substantial 1,650-pound ballast ensure good stability and upwind ability. Her moderate displacement of 4,250 pounds strikes an appealing balance between manageable size and seaworthy heft. The keel/centerboard configuration offers versatility for both deeper waters and shoal exploration. With a comfort ratio of 21.18, this boat leans toward the performance end of the spectrum while maintaining reasonable accommodations for weekend cruising or extended coastal adventures. The low capsize screening value of 1.9 indicates good stability characteristics. Hull speed of 5.84 knots provides respectable passage-making ability for coastal cruising and day sailing. The Sparkman & Stephens pedigree ensures refined underwater lines and balanced helm characteristics that made this design popular among discerning sailors seeking quality in a compact package.

Core Dimensions
LOA (Length Overall) 24.16 ft / 7.36 m
LWL (Waterline Length) 19.00 ft / 5.79 m
Beam 7.67 ft / 2.34 m
Max Draft 5.16 ft / 1.57 m
Min Draft 2.83 ft / 0.86 m
Displacement 4,250.00 lb / 1,928 kg
Ballast 1,650.00 lb / 748 kg
Ballast Type Lead
Sail Area (Reported) 295.00 ft² / 27.41 m²
Design & Construction
Hull Type Keel/Cbrd.
Rigging Type Masthead Sloop
Construction FG
Designer Sparkman & Stephens
Builder Yankee Yachts Inc. (USA)
First Built 1968
Associations Dolphin 24 Class (S&S)
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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
 18.04
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
 38.82
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
 276.62
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
 21.18
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
 1.9
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. 5.84 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
 2.02
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. 520.71 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. 18.02
Rig Dimensions
I (Foretriangle Height) 30.75 ft / 9.37 m
J (Foretriangle Base) 9.00 ft / 2.74 m
P (Mainsail Luff) 26.42 ft / 8.05 m
E (Mainsail Foot) 11.83 ft / 3.61 m
SA Fore 138.38 ft² / 12.86 m²
SA Main 156.27 ft² / 14.52 m²
SA Total (100%) 294.65 ft² / 27.37 m²
Est. Forestay Length 32.04 ft / 9.77 m
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