Grampian Classic 31
Description
The Grampian Classic 31, designed by American naval architect Peter Van Dine in the mid-1960s and produced by Grampian Marine in Oakville, Ontario, from the late 1960s to early 1970s (with some hulls and kits completed by Classic Yachts Canada into the 1980s), embodies the era's Cruising Club of America (CCA) rule influences as a heavy-displacement, full-keel cruiser prioritizing seaworthiness and comfort over speed, with around 50–100 examples built. Measuring 31 feet LOA, 24 feet LWL, 9 feet beam, and 10,500 pounds displacement with 4,200 pounds of internal lead ballast yielding a robust .40 ballast/displacement ratio for stiffness and self-righting in rough conditions, it draws 4 feet 10 inches on its encapsulated full keel and employs a masthead sloop rig with 475 square feet of sail area—delivering a modest SA/D of 13.2, D/L of 444 (heavy cruiser classification), and estimated PHRF around 210 for steady coastal or offshore passages at a 6.7-knot hull speed. Constructed with Grampian's hallmark thick hand-laid fiberglass for durability—often lauded as "bulletproof" in forums for withstanding gales—the interior offers 6 feet of headroom in a traditional layout with V-berth forward, U-shaped galley, convertible dinette, enclosed head with shower, and quarter berth for four, complemented by a protected cockpit and tanks holding 40 gallons water and 25 gallons fuel.
Construction Details
| Designer | Peter van Dine |
|---|---|
| Builder | Grampian Marine |
| Length | 30.920 ft |
| LOA | 30.920 ft |
| LWL | 22.290 ft |
| Beam | 8.400 ft |
| Displacement | 9722 lb |
| Max Draft | 4.400 ft |
The standard boat dimensions
| i | 33.50 ft |
|---|---|
| j | 13.50 ft |
| p | 29.50 ft |
| e | 14.50 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 33.50 ft | 13.50 ft | 29.50 ft | 14.50 ft | - | - | - | - |
Sails
| Sail Type | MAINSAIL |
|---|---|
| Luff | * 29.5 ft - (8992 mm) |
| Foot | * 14.5 ft - (4420 mm) |
| Leech | * 32.12 ft - (9790 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 32.41 ft - (9879 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | * 220.31 ft² |
| Sail Type | JIBSAIL |
|---|---|
| Luff | * 28.89 ft - (8806 mm) |
| Foot | * 18.71 ft - (5703 mm) |
| Leech | * 24.1 ft - (7346 mm) |
| Percentage LP | * 114.96 % |
| Length Perpendicular | * 15.52 ft - (4730 mm) |
| Deck Angle | * 12.01 ° |
| Area | * 224.17 ft² |
| Sail Type | GENOA |
|---|---|
| Luff | * 34.31 ft - (10458 mm) |
| Foot | * 22.52 ft - (6864 mm) |
| Leech | * 31.75 ft - (9677 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 20.25 ft - (6172 mm) |
| Deck Angle | * 4 ° |
| Area | * 347.37 ft² |
| Sail Type | SPINNAKER |
|---|---|
| Stays | * 34.31 ft - (10458 mm) |
| MidGirth | * 24.3 ft - (7407 mm) |
| Foot | * 24.3 ft - (7407 mm) |
| Perc LP | * 180 % |
| Area | * 709 ft² |
Disclaimer. Boats are not all the same -- even when produced in the same factory of the same model. Sailrite does its best to publish accurate dimensions, but we often find it worthwhile to have our customers measure their boats carefully before we produce kits for them. You should take the same precautions, especially when the data is not from Sailrite. The information on this site is not guaranteed to be accurate. Sailrite offers this content as a service to our community, but takes no responsibility for the reliability of the data provided.