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Grampian Classic 31

Designer: Peter Van Dine  ·  Builder: Grampian Marine Ltd.  ·  First built: 1964
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About the Grampian Classic 31

Built during the 1970s and early 1980s, this Canadian-designed cruiser emerged from Grampian Marine's lineup as a practical coastal sailing yacht aimed at the growing recreational boating market. The Classic 31 represents the builder's focus on creating affordable yet seaworthy vessels for weekend cruising and extended coastal passages. Featuring traditional lines with a moderate beam and fin keel configuration, the design emphasizes stability and ease of handling over pure performance. The boat's solid fiberglass construction reflects the building standards of its era, prioritizing durability and low maintenance for owner-operators. Below deck, the layout typically maximizes living space within the hull's dimensions, offering comfortable accommodations for a small crew on extended cruises. While not renowned as a racing thoroughbred, the Classic 31 earned respect among cruising sailors for its predictable handling characteristics and seaworthiness in coastal waters. The design strikes a practical balance between sailing performance and comfort, making it well-suited for Great Lakes sailing, coastal cruising, and as an entry point into serious sailboat ownership. Today, these boats represent solid value in the used market for sailors seeking a capable cruising platform with proven offshore credentials.

Core Dimensions
LOA (Length Overall) 30.92 ft / 9.42 m
LWL (Waterline Length) 22.29 ft / 6.79 m
Beam 8.40 ft / 2.56 m
Max Draft 4.40 ft / 1.34 m
Displacement 9,722.00 lb / 4,410 kg
Sail Area (Reported) 440.00 ft² / 40.88 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Cutter
Construction FG
Designer Peter Van Dine
Builder Grampian Marine Ltd.
First Built 1964
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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
15.51
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
35.46
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
1.58
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. 6.33
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
1.09
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. 669.01
Rig Dimensions
I (Foretriangle Height) 33.5
J (Foretriangle Base) 13.5
P (Mainsail Luff) 29.5
E (Mainsail Foot) 14.5
SA Fore 226.13
SA Main 213.88
How It Compares

vs. Bristol 311, Ericson 31 Independence, Hughes 31, Offshore 31 Cheoy Lee, Seafarer 31 Mkii

This boat Similar boats
Dimensions
LOA
Grampian Classic 31 ★
30.9 ft
Bristol 311
31.0 ft
Ericson 31 Independence
30.9 ft
Hughes 31
31.0 ft
Offshore 31 Cheoy Lee
31.0 ft
Seafarer 31 Mkii
31.0 ft
LWL
Grampian Classic 31 ★
22.3 ft
Bristol 311
24.8 ft
Ericson 31 Independence
23.9 ft
Hughes 31
24.0 ft
Offshore 31 Cheoy Lee
23.3 ft
Seafarer 31 Mkii
25.1 ft
Beam
Grampian Classic 31 ★
8.4 ft
Bristol 311
10.2 ft
Ericson 31 Independence
10.4 ft
Hughes 31
9.7 ft
Offshore 31 Cheoy Lee
8.8 ft
Seafarer 31 Mkii
9.8 ft
Displacement
Grampian Classic 31 ★
9 lbs
Bristol 311
11 lbs
Ericson 31 Independence
11 lbs
Hughes 31
9 lbs
Offshore 31 Cheoy Lee
10 lbs
Seafarer 31 Mkii
10 lbs
Ballast
Grampian Classic 31 ★
Bristol 311
4 lbs
Ericson 31 Independence
4 lbs
Hughes 31
3 lbs
Offshore 31 Cheoy Lee
3 lbs
Seafarer 31 Mkii
4 lbs
Sail Area
Grampian Classic 31 ★
440 sq ft
Bristol 311
455 sq ft
Ericson 31 Independence
Hughes 31
Offshore 31 Cheoy Lee
403 sq ft
Seafarer 31 Mkii
Performance
SA / Displacement (higher = more powerful)
Grampian Classic 31 ★
15.5
Bristol 311
14.6
Ericson 31 Independence
Hughes 31
Offshore 31 Cheoy Lee
13.3
Seafarer 31 Mkii
Ballast / Disp (higher = stiffer)
Grampian Classic 31 ★
Bristol 311
40.2 %
Ericson 31 Independence
39.5 %
Hughes 31
36.8 %
Offshore 31 Cheoy Lee
35.5 %
Seafarer 31 Mkii
47.1 %
Comfort Ratio (higher = more comfortable offshore)
Grampian Classic 31 ★
35.5
Bristol 311
29.6
Ericson 31 Independence
Hughes 31
Offshore 31 Cheoy Lee
35.9
Seafarer 31 Mkii
Capsize Screening (lower = safer)
Grampian Classic 31 ★
1.58
Bristol 311
1.82
Ericson 31 Independence
Hughes 31
Offshore 31 Cheoy Lee
1.59
Seafarer 31 Mkii
Displacement / Length (lower = lighter)
Grampian Classic 31 ★
Bristol 311
329
Ericson 31 Independence
371
Hughes 31
293
Offshore 31 Cheoy Lee
376
Seafarer 31 Mkii
291
Hull Speed
Grampian Classic 31 ★
6.3 kts
Bristol 311
6.7 kts
Ericson 31 Independence
Hughes 31
Offshore 31 Cheoy Lee
6.5 kts
Seafarer 31 Mkii
Speed Number (higher = faster)
Grampian Classic 31 ★
1.1
Bristol 311
1.4
Ericson 31 Independence
Hughes 31
Offshore 31 Cheoy Lee
1.0
Seafarer 31 Mkii
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