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Classic 37 Grampian
Designer: Sparkman & Stephens  ·  Builder: Grampian Marine Ltd. (Can)  ·  First built: 1964
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About the Classic 37 Grampian

Designed by the legendary Sparkman & Stephens naval architecture firm, this distinguished 37-footer represents classic yacht design from the golden age of fiberglass sailing. Built by Grampian Marine in Canada starting in 1964, only thirty hulls were produced, making this masthead sloop a relatively rare find among vintage sailboats. The yacht's proportions reflect S&S's timeless approach to seaworthiness and performance. With a displacement of 16,400 pounds and substantial ballast of 7,400 pounds, she offers the stability and solid feel that serious cruising sailors appreciate. The fin keel configuration provides good windward ability while maintaining reasonable draft for accessing most harbors and anchorages. Her comfort ratio of 39.05 and conservative capsize screening value of 1.6 indicate excellent seaworthiness, making her well-suited for coastal cruising and capable of offshore passages. The sail area-to-displacement ratio of 15.9 suggests moderate performance characteristics—she won't be the fastest boat in light air, but will maintain steady progress in a variety of conditions. This Grampian appeals to sailors seeking a well-built, traditionally styled cruising yacht with proven ocean-going pedigree. Her Sparkman & Stephens heritage ensures classic lines and seaworthy handling characteristics that have stood the test of time.

Core Dimensions
LOA (Length Overall) 37.33 ft / 11.38 m
LWL (Waterline Length) 26.27 ft / 8.01 m
Beam 10.16 ft / 3.10 m
Max Draft 5.83 ft / 1.78 m
Displacement 16,400.00 lb / 7,439 kg
Ballast 7,400.00 lb / 3,357 kg
Sail Area (Reported) 639.00 ft² / 59.37 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Masthead Sloop
Construction FG
Designer Sparkman & Stephens
Builder Grampian Marine Ltd. (CAN)
First Built 1964
Number Built 30
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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
 15.9
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
 45.12
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
 403.85
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
 39.05
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
 1.6
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. 6.87 kn
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. 953.67 pounds/inch
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