Introduced in 1963 by Peter Van Dine and built by Canadian manufacturer Grampian Marine, this 31-footer represents classic early fiberglass boat design with enduring appeal for coastal cruising enthusiasts. The cutter rig configuration provides excellent sail handling versatility, allowing sailors to reduce sail area efficiently in changing conditions while maintaining good balance and control. With a displacement of 9,600 pounds and a comfort ratio of 33.56, this design prioritizes stability and seaworthiness over pure performance. The substantial weight combined with a fin keel configuration creates a predictable, confidence-inspiring platform well-suited for extended coastal passages and weekend cruising. The moderate sail area-to-displacement ratio of 15.46 indicates a boat that won't set speed records but will provide steady, reliable progress in varied conditions. The capsize screening value of 1.63 falls within acceptable ranges for coastal and near-shore sailing, though this isn't intended as an offshore passagemaker. The hull's 22.30-foot waterline length delivers a theoretical hull speed of 6.33 knots, typical for cruising-oriented designs of this era. Grampian's reputation for solid construction means many examples remain actively sailed today, making this an attractive option for sailors seeking classic character with proven seaworthiness.
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What is the Classic 31's sail area to displacement ratio?
The Classic 31 has a Sail Area to Displacement ratio (SA/D) of 15.46. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.
What is the Classic 31's comfort ratio?
The Classic 31 has a Ted Brewer Comfort Ratio of 33.56. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.
Is the Classic 31 safe for offshore sailing?
The Classic 31 has a Capsize Screening Formula value of 1.63. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.
What is the hull speed of the Classic 31?
The theoretical hull speed of the Classic 31 is 6.33 kn knots, calculated from its waterline length.
How much does a Classic 31 weigh?
The Classic 31 has a displacement of 9,600.00 lb and a length overall (LOA) of 30.92 ft.
Who designed the Classic 31?
The Classic 31 was designed by Peter Van Dine, first built in 1963.