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Great Lakes Catboat
Designer: Rolf Van Der Sleen  ·  Builder: Custom Yachts Of Hamilton (Can)  ·  First built: 1981
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About the Great Lakes Catboat

Designed by Rolf Van Der Sleen and built by Custom Yachts of Hamilton in Canada, this compact catboat represents a thoughtful adaptation of the traditional catboat concept for inland waters. With only twelve hulls produced beginning in 1981, the Great Lakes Catboat remains a rare sight on the water, making it an intriguing find for sailors seeking something distinctive. The boat's defining characteristic is its unstayed cat rig, which eliminates the complexity of standing rigging while providing straightforward sailing dynamics. At just over 1,200 pounds displacement with a swing keel configuration, this design prioritizes shallow-water exploration and easy launching—ideal traits for the variable conditions found throughout the Great Lakes region. The generous beam relative to length creates a stable platform, while the retractable keel system allows access to shoal waters and simplified trailering. Best suited for coastal cruising, day sailing, and exploring protected waters, this catboat offers the classic simplicity that made the type famous along New England shores. The fiberglass construction ensures durability, while the comfortable proportions make it an appealing choice for sailors who appreciate traditional aesthetics combined with practical modern materials. Its rarity adds collector appeal for enthusiasts of distinctive sailing craft.

Core Dimensions
LOA (Length Overall) 16.00 ft / 4.88 m
LWL (Waterline Length) 15.00 ft / 4.57 m
Beam 8.00 ft / 2.44 m
Max Draft 0.58 ft / 0.18 m
Min Draft 3.00 ft / 0.91 m
Displacement 1,250.00 lb / 567 kg
Sail Area (Reported) 172.00 ft² / 15.98 m²
Design & Construction
Hull Type Swing Keel
Rigging Type Cat (unstayed)
Construction FG
Designer Rolf Van Der Sleen
Builder Custom Yachts of Hamilton (CAN)
First Built 1981
Number Built 12
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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
23.76
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
165.34
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
7.91
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
2.97
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. 5.19 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. 428.77 pounds/inch
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