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S2 91 Sd
Designer: Graham & Schlageter  ·  Builder: S2 Yachts  ·  First built: 1983
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About the S2 91 Sd

Produced by S2 Yachts, a Michigan-based builder known throughout the 1970s and 1980s for crafting well-finished, approachable sailboats, the 91 Sd represents the company's commitment to delivering capable boats for everyday sailors. S2 Yachts earned a strong reputation for quality construction and practical design, and their lineup attracted a loyal following among coastal cruisers and weekend sailors across North America. While detailed specifications for the 91 Sd are limited, boats from S2's catalog were generally designed with recreational sailing in mind, offering a balance of comfort and performance suited to day sailing and coastal cruising. S2 designs of this era tended to feature solid fiberglass construction, manageable rigs, and cockpit layouts oriented toward ease of handling for small crews or family outings. For a buyer researching this model, connecting with owners through sailing forums or the broader S2 Yachts community can be invaluable for uncovering real-world insights. Given the brand's reputation for durability, a well-maintained example is likely to offer reliable, enjoyable sailing for those seeking an unpretentious and seaworthy coastal companion.

Core Dimensions
LOA (Length Overall) 29.83 ft / 9.09 m
LWL (Waterline Length) 25.00 ft / 7.62 m
Beam 10.50 ft / 3.20 m
Max Draft 4.50 ft / 1.37 m
Displacement 7,850.00 lb / 3,561 kg
Sail Area (Reported) 490.00 ft² / 45.52 m²
Design & Construction
Hull Type Fin w/transom hung rudder
Rigging Type Masthead Sloop
Construction FG
Designer Graham & Schlageter
Builder S2 Yachts
First Built 1983
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
19.91
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
20.02
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
2.12
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. 6.7
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
2.73
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. 937.94
Rig Dimensions
I (Foretriangle Height) 41.3
J (Foretriangle Base) 12.0
P (Mainsail Luff) 35.3
E (Mainsail Foot) 13.7
SA Fore 247.8
SA Main 241.81
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