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Seaman 30
Designer: William H. Tripp Jr.  ·  Builder: Seaman Seacraft Co, Inc.  ·  First built: 1955
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About the Seaman 30

A compact cruiser from the Soviet-era Eastern European boatbuilding tradition, the Seaman 30 is a production sailboat that found its place among recreational sailors looking for an accessible and practical vessel for coastal and inland cruising. Built with straightforward, functional design principles in mind, it reflects the utilitarian approach common to boats produced during that period, prioritizing reliability and ease of handling over performance refinement. The Seaman 30 is generally considered a capable daysailer and coastal cruiser suited to sheltered waters and fair-weather passages rather than demanding offshore work. Its modest dimensions make it manageable for a small crew or even a solo sailor, and its construction tends toward the robust rather than the elegant. While it lacks the racing pedigree or design prestige of contemporary Western production boats, it has developed a modest following among sailors in Eastern Europe who appreciate its simplicity and the relative availability of parts and knowledge within those communities. For a buyer on a budget seeking an unpretentious entry into cruising sailboats, the Seaman 30 offers a straightforward platform worth considering.

Core Dimensions
LOA (Length Overall) 30.42 ft / 9.27 m
LWL (Waterline Length) 20.00 ft / 6.10 m
Beam 8.50 ft / 2.59 m
Max Draft 4.25 ft / 1.30 m
Displacement 9,000.00 lb / 4,082 kg
Sail Area (Reported) 424.00 ft² / 39.39 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Fractional Sloop
Construction Wood
Designer William H. Tripp Jr.
Builder Seaman Seacraft Co, Inc.
First Built 1955
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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
15.73
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
34.76
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
1.64
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. 5.99
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. 607.43
How It Compares

vs. Eastward Ho Sr 31, Rawson 30, Seawind Allied

This boat Similar boats
Dimensions
LOA
Seaman 30 ★
30.4 ft
Eastward Ho Sr 31
30.5 ft
Rawson 30
30.5 ft
Seawind Allied
30.5 ft
LWL
Seaman 30 ★
20.0 ft
Eastward Ho Sr 31
24.0 ft
Rawson 30
22.0 ft
Seawind Allied
24.0 ft
Beam
Seaman 30 ★
8.5 ft
Eastward Ho Sr 31
9.8 ft
Rawson 30
9.0 ft
Seawind Allied
9.3 ft
Displacement
Seaman 30 ★
9 lbs
Eastward Ho Sr 31
11 lbs
Rawson 30
12 lbs
Seawind Allied
12 lbs
Ballast
Seaman 30 ★
Eastward Ho Sr 31
4 lbs
Rawson 30
5 lbs
Seawind Allied
4 lbs
Sail Area
Seaman 30 ★
424 sq ft
Eastward Ho Sr 31
478 sq ft
Rawson 30
424 sq ft
Seawind Allied
502 sq ft
Performance
SA / Displacement (higher = more powerful)
Seaman 30 ★
15.7
Eastward Ho Sr 31
15.5
Rawson 30
13.0
Seawind Allied
15.4
Ballast / Disp (higher = stiffer)
Seaman 30 ★
Eastward Ho Sr 31
40.9 %
Rawson 30
41.7 %
Seawind Allied
35.0 %
Comfort Ratio (higher = more comfortable offshore)
Seaman 30 ★
34.8
Eastward Ho Sr 31
31.3
Rawson 30
40.5
Seawind Allied
36.9
Capsize Screening (lower = safer)
Seaman 30 ★
1.64
Eastward Ho Sr 31
1.77
Rawson 30
1.58
Seawind Allied
1.62
Displacement / Length (lower = lighter)
Seaman 30 ★
Eastward Ho Sr 31
355
Rawson 30
503
Seawind Allied
387
Hull Speed
Seaman 30 ★
6.0 kts
Eastward Ho Sr 31
6.6 kts
Rawson 30
6.3 kts
Seawind Allied
6.6 kts
Speed Number (higher = faster)
Seaman 30 ★
Eastward Ho Sr 31
1.2
Rawson 30
0.6
Seawind Allied
1.0
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