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S2 91 Sm
Designer: Graham & Schlageter  ·  First built: 1983
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About the S2 91 Sm

Produced by S2 Yachts, a Michigan-based builder that earned a strong reputation throughout the 1970s and 1980s for crafting well-finished, performance-oriented sailboats, the 91 Sm represents the kind of mid-range cruiser-racer that defined American recreational sailing during that era. S2 Yachts was founded by Leon Slikkers, who brought a fiberglass construction expertise and an eye for quality that set the brand apart from many of its contemporaries. While detailed specifications for this particular model are limited, the 91 Sm fits within S2's broader tradition of building boats that balance comfortable cruising with responsive sailing characteristics. Buyers drawn to this vessel can generally expect the solid build quality and thoughtful deck layouts that became hallmarks of the S2 lineup. These traits make it a reasonable candidate for coastal cruising and weekend sailing, offering a manageable platform for intermediate sailors looking to explore nearshore waters in comfort. For anyone researching this model, connecting with S2 owners' communities and forums is highly recommended, as fellow owners often hold the most detailed knowledge about this specific variant's performance, quirks, and long-term ownership experience.

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 5.50 ft / 1.68 m
Displacement 7,850.00 lb / 3,561 kg
Sail Area (Reported) 444.00 ft² / 41.25 m²
Design & Construction
Hull Type Fin w/transom hung rudder
Rigging Type Masthead Sloop
Construction FG
Designer Graham & Schlageter
First Built 1983
Related Sailboats ["S2 91 Se" · "S2 91 Sd" · "S2 91" · "Seidelmann 30" · "J30"]
Owner Reviews

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Known Issues & What to Watch For

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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
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
2.54
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) 40.0
J (Foretriangle Base) 12.0
P (Mainsail Luff) 34.0
E (Mainsail Foot) 12.0
SA Fore 240.0
SA Main 204.0
How It Compares

vs. S2 91, S2 91 Sd, Seidelmann 30

This boat Similar boats
Dimensions
LOA
S2 91 Sm ★
29.8 ft
S2 91
29.8 ft
S2 91 Sd
29.8 ft
Seidelmann 30
29.8 ft
LWL
S2 91 Sm ★
25.0 ft
S2 91
25.0 ft
S2 91 Sd
25.0 ft
Seidelmann 30
25.0 ft
Beam
S2 91 Sm ★
10.5 ft
S2 91
10.5 ft
S2 91 Sd
10.5 ft
Seidelmann 30
12.0 ft
Displacement
S2 91 Sm ★
7 lbs
S2 91
7 lbs
S2 91 Sd
7 lbs
Seidelmann 30
9 lbs
Ballast
S2 91 Sm ★
S2 91
3 lbs
S2 91 Sd
Seidelmann 30
4 lbs
Sail Area
S2 91 Sm ★
444 sq ft
S2 91
490 sq ft
S2 91 Sd
490 sq ft
Seidelmann 30
Performance
SA / Displacement (higher = more powerful)
S2 91 Sm ★
18.0
S2 91
19.9
S2 91 Sd
19.9
Seidelmann 30
Ballast / Disp (higher = stiffer)
S2 91 Sm ★
S2 91
40.8 %
S2 91 Sd
Seidelmann 30
47.9 %
Comfort Ratio (higher = more comfortable offshore)
S2 91 Sm ★
20.0
S2 91
20.0
S2 91 Sd
20.0
Seidelmann 30
Capsize Screening (lower = safer)
S2 91 Sm ★
2.12
S2 91
2.12
S2 91 Sd
2.12
Seidelmann 30
Displacement / Length (lower = lighter)
S2 91 Sm ★
S2 91
224
S2 91 Sd
Seidelmann 30
268
Hull Speed
S2 91 Sm ★
6.7 kts
S2 91
6.7 kts
S2 91 Sd
6.7 kts
Seidelmann 30
Speed Number (higher = faster)
S2 91 Sm ★
2.5
S2 91
2.7
S2 91 Sd
2.7
Seidelmann 30
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