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East Coast 31
Designer: Peter Cole  ·  Builder: East Coast Yachts  ·  First built: 1974
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About the East Coast 31

Built during the 1970s, this Carl Alberg-designed cruiser represents classic American sailboat craftsmanship from an era when seaworthiness took precedence over speed. The design reflects Alberg's characteristic approach to creating sturdy, reliable boats that prioritize safety and comfort over racing performance. With her traditional lines and full keel configuration, the East Coast 31 embodies the qualities that made Alberg designs highly respected among serious cruising sailors. The boat's moderate beam and sensible proportions create a stable platform that handles coastal cruising with confidence, while the deep, full keel provides excellent tracking and predictable sailing characteristics in various conditions. Though not a speed demon by modern standards, this design compensates with exceptional build quality and seaworthiness that appeals to sailors seeking a dependable cruising companion. The cockpit and cabin layout prioritize functionality and comfort for extended periods aboard, making her well-suited for coastal exploration and weekend cruising. Alberg's reputation for creating boats that "take care of their crews" is evident in this design, where thoughtful details and robust construction create a sailing experience focused on safety and enjoyment rather than pure performance.

Core Dimensions
LOA (Length Overall) 31.00 ft / 9.45 m
LWL (Waterline Length) 24.75 ft / 7.54 m
Beam 10.55 ft / 3.22 m
Max Draft 5.50 ft / 1.68 m
Displacement 9,500.00 lb / 4,309 kg
Sail Area (Reported) 454.00 ft² / 42.18 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Masthead Sloop
Construction FG
Designer Peter Cole
Builder East Coast Yachts
First Built 1974
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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
16.25
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
23.91
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
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. 6.67
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
1.84
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. 932.98
Rig Dimensions
I (Foretriangle Height) 38.5
J (Foretriangle Base) 13.6
P (Mainsail Luff) 34.3
E (Mainsail Foot) 11.2
SA Fore 261.8
SA Main 192.08
How It Compares

vs. Berwick 31 Westerly, Hughes 31, Longbow 31 Westerly, Rival 31, Seafarer 31 Mkii

This boat Similar boats
Dimensions
LOA
East Coast 31 ★
31.0 ft
Berwick 31 Westerly
31.0 ft
Hughes 31
31.0 ft
Longbow 31 Westerly
31.0 ft
Rival 31
31.0 ft
Seafarer 31 Mkii
31.0 ft
LWL
East Coast 31 ★
24.8 ft
Berwick 31 Westerly
25.0 ft
Hughes 31
24.0 ft
Longbow 31 Westerly
25.0 ft
Rival 31
24.5 ft
Seafarer 31 Mkii
25.1 ft
Beam
East Coast 31 ★
10.6 ft
Berwick 31 Westerly
9.5 ft
Hughes 31
9.7 ft
Longbow 31 Westerly
9.5 ft
Rival 31
9.7 ft
Seafarer 31 Mkii
9.8 ft
Displacement
East Coast 31 ★
9 lbs
Berwick 31 Westerly
9 lbs
Hughes 31
9 lbs
Longbow 31 Westerly
9 lbs
Rival 31
11 lbs
Seafarer 31 Mkii
10 lbs
Ballast
East Coast 31 ★
Berwick 31 Westerly
4 lbs
Hughes 31
3 lbs
Longbow 31 Westerly
4 lbs
Rival 31
4 lbs
Seafarer 31 Mkii
4 lbs
Sail Area
East Coast 31 ★
454 sq ft
Berwick 31 Westerly
Hughes 31
Longbow 31 Westerly
371 sq ft
Rival 31
Seafarer 31 Mkii
Performance
SA / Displacement (higher = more powerful)
East Coast 31 ★
16.3
Berwick 31 Westerly
Hughes 31
Longbow 31 Westerly
13.4
Rival 31
Seafarer 31 Mkii
Ballast / Disp (higher = stiffer)
East Coast 31 ★
Berwick 31 Westerly
45.3 %
Hughes 31
36.8 %
Longbow 31 Westerly
Rival 31
40.0 %
Seafarer 31 Mkii
47.1 %
Comfort Ratio (higher = more comfortable offshore)
East Coast 31 ★
23.9
Berwick 31 Westerly
Hughes 31
Longbow 31 Westerly
27.0
Rival 31
31.9
Seafarer 31 Mkii
Capsize Screening (lower = safer)
East Coast 31 ★
2.00
Berwick 31 Westerly
Hughes 31
Longbow 31 Westerly
1.80
Rival 31
1.73
Seafarer 31 Mkii
Displacement / Length (lower = lighter)
East Coast 31 ★
Berwick 31 Westerly
279
Hughes 31
293
Longbow 31 Westerly
Rival 31
339
Seafarer 31 Mkii
291
Hull Speed
East Coast 31 ★
6.7 kts
Berwick 31 Westerly
Hughes 31
Longbow 31 Westerly
6.7 kts
Rival 31
6.6 kts
Seafarer 31 Mkii
Speed Number (higher = faster)
East Coast 31 ★
1.8
Berwick 31 Westerly
Hughes 31
Longbow 31 Westerly
1.7
Rival 31
Seafarer 31 Mkii
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