Design and Construction
Van Dine's hull is solid fiberglass with a fin keel, and the Canadian yard built her as a straightforward glass cruiser rather than a lightweight racer. The numbers tell the story of a boat meant to carry load and sit quietly: an immersion rate of roughly 652 pounds per inch means she settles slowly under stores and crew, and a Motion Comfort Ratio of 39.9 puts her ahead of 99% of similar designs for settled motion in a seaway. The fin keel and solid fiberglass hull and a capsize screening value of 1.51 are such that, by that formula alone, she would be accepted for ocean racing, though her sail-area/displacement ratio of 14.66 and her 6.3-knot theoretical hull speed mark her as a heavy displacement cruiser rather than a performance boat.
Rig and Handling
The cutter rig carries a 227-square-foot mainsail and a 167-square-foot jib, with a 440-square-foot total sail plan that suits her 9,722-pound hull. Sheet spec from the period lists half-inch diameter lines throughout — a 77.3-foot mainsheet, 30.9-foot jib and genoa sheets, and a 68-foot spinnaker sheet — sizing that reflects a boat worked by hand. Under power, the Universal Atomic 4 gasoline engine of 30 horsepower gives a calculated maximum of about 5.8 knots, short of her 6.3-knot sailing hull speed but adequate for marina maneuvering given the shallow 4.4-to-4.7-foot draft that lets her into modest coves and shallow berths.
Accommodations
Below, the Classic 31 provides four berths and 6 feet 2 inches of headroom, a full-standing height that was generous for a 31-foot design of the mid-1960s. The 8-foot-4.5-inch beam and narrow length-to-beam proportion keep the hull slim outside but the interior volume is usable for a couple with guests. The boat's liveability follows from those dimensions and her heavy-comfort tuning.
The Verdict
The Grampian Classic 31 is a heavily built Van Dine cruiser from Grampian Marine's mid-1960s range, tuned for comfort and load-carrying rather than pace. Her ultra-heavy displacement and high Motion Comfort Ratio make her a stable offshore-capable platform by the capsize screen, while her narrow beam and shallow fin keel keep her manageable in confined water. The Atomic 4 and modest sail plan are period-correct and serviceable, though not quick.
Pros
- Exceptionally comfortable motion, exceeding 99% of similar designs by comfort ratio
- Ultra-heavy displacement with only 2% of peers heavier, for load and sea-kindliness
- Shallow 4.4–4.7-foot draft eases marina and coastal access
- Full 6'2" headroom and four berths in a 31-foot hull
Cons
- Sail-area/displacement of 14.66 and 6.3-knot hull speed limit performance
- Gasoline Atomic 4 requires the care any vintage carbureted engine demands
- Narrow beam relative to length limits interior width versus beamier later cruisers
