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S2 73 Sd
Designer: Graham & Schlageter  ·  Builder: S2 Yachts  ·  First built: 1978
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About the S2 73 Sd

Produced by S2 Yachts, a Michigan-based builder that earned a strong reputation for quality construction throughout the 1970s and 1980s, the S2 73 Sd represents the kind of thoughtful American sailboat design that appealed to sailors seeking reliable performance without sacrificing comfort. S2 Yachts was known for producing well-finished, competently engineered boats that struck a balance between lively sailing characteristics and practical cruising amenities, and the 73 Sd fits comfortably within that tradition. While detailed specifications for this particular model are limited, the S2 lineup generally targeted sailors interested in coastal and inland cruising, making these boats well-suited to weekend passages, lake sailing, and protected waterway exploration. S2's designs were typically accessible to intermediate sailors while still rewarding those with more experience at the helm. For buyers researching this model, tracking down owner communities and class associations can be a valuable way to uncover real-world insights about the 73 Sd's handling, below-deck layout, and long-term ownership experience. Like many S2 vessels, it likely represents a solid entry point into quality American sailboat ownership.

Core Dimensions
LOA (Length Overall) 23.83 ft / 7.26 m
LWL (Waterline Length) 18.50 ft / 5.64 m
Beam 8.00 ft / 2.44 m
Max Draft 2.83 ft / 0.86 m
Displacement 3,250.00 lb / 1,474 kg
Ballast 1,300.00 lb / 590 kg
Sail Area (Reported) 255.00 ft² / 23.69 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Graham & Schlageter
Builder S2 Yachts
First Built 1978
Related Sailboats Catalina 22 · S2 73 · Ranger 23 · Moore 24 · Mirage 24
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
18.64
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
15.66
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
2.16
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. 5.76
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
2.55
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. 528.82
Rig Dimensions
I (Foretriangle Height) 29.0
J (Foretriangle Base) 10.25
P (Mainsail Luff) 25.0
E (Mainsail Foot) 8.5
SA Fore 148.63
SA Main 106.25
How It Compares

vs. Catalina 22, Mirage 24, Moore 24, Ranger 23, S2 73

This boat Similar boats
Dimensions
LOA
S2 73 Sd ★
23.8 ft
Catalina 22
23.8 ft
Mirage 24
23.8 ft
Moore 24
23.8 ft
Ranger 23
23.7 ft
S2 73
23.8 ft
LWL
S2 73 Sd ★
18.5 ft
Catalina 22
19.3 ft
Mirage 24
20.1 ft
Moore 24
21.8 ft
Ranger 23
20.0 ft
S2 73
18.5 ft
Beam
S2 73 Sd ★
8.0 ft
Catalina 22
7.7 ft
Mirage 24
8.4 ft
Moore 24
7.2 ft
Ranger 23
7.9 ft
S2 73
8.0 ft
Displacement
S2 73 Sd ★
3 lbs
Catalina 22
2 lbs
Mirage 24
3 lbs
Moore 24
2 lbs
Ranger 23
3 lbs
S2 73
3 lbs
Ballast
S2 73 Sd ★
1 lbs
Catalina 22
550 lbs
Mirage 24
1 lbs
Moore 24
1 lbs
Ranger 23
1 lbs
S2 73
1 lbs
Sail Area
S2 73 Sd ★
255 sq ft
Catalina 22
212 sq ft
Mirage 24
Moore 24
247 sq ft
Ranger 23
244 sq ft
S2 73
255 sq ft
Performance
PHRF Rating (lower = faster)
S2 73 Sd ★
Catalina 22
276 s/nm
Mirage 24
228 s/nm
Moore 24
158 s/nm
Ranger 23
222 s/nm
S2 73
SA / Displacement (higher = more powerful)
S2 73 Sd ★
18.6
Catalina 22
19.8
Mirage 24
Moore 24
24.6
Ranger 23
17.3
S2 73
18.6
Ballast / Disp (higher = stiffer)
S2 73 Sd ★
Catalina 22
24.4 %
Mirage 24
40.5 %
Moore 24
48.8 %
Ranger 23
S2 73
40.0 %
Comfort Ratio (higher = more comfortable offshore)
S2 73 Sd ★
15.7
Catalina 22
11.1
Mirage 24
Moore 24
10.3
Ranger 23
15.8
S2 73
15.7
Capsize Screening (lower = safer)
S2 73 Sd ★
2.16
Catalina 22
2.34
Mirage 24
Moore 24
2.26
Ranger 23
2.11
S2 73
2.16
Displacement / Length (lower = lighter)
S2 73 Sd ★
Catalina 22
139
Mirage 24
204
Moore 24
88
Ranger 23
S2 73
229
Hull Speed
S2 73 Sd ★
5.8 kts
Catalina 22
5.9 kts
Mirage 24
Moore 24
6.3 kts
Ranger 23
6.0 kts
S2 73
5.8 kts
Speed Number (higher = faster)
S2 73 Sd ★
2.6
Catalina 22
3.9
Mirage 24
Moore 24
5.7
Ranger 23
2.9
S2 73
2.6
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