Designed by renowned naval architect John C. Alden in 1925, this classic 18-footer represents the golden age of wooden small-boat construction. Built by skilled craftsmen George Shiverick and George Chaisson, only 60 of these charming centerboard sloops were ever constructed, making them highly sought-after classics today.
The Duxbury Duck's traditional wood-planked hull and fractional sloop rig embody Alden's signature blend of seaworthiness and elegance. With her moderate beam and shallow 2.5-foot draft courtesy of the centerboard configuration, she's perfectly suited for exploring shoal waters, protected bays, and coastal cruising where deeper keelboats fear to venture. The generous sail area of 342 square feet provides spirited performance in light to moderate conditions.
Her favorable comfort ratio of 5.8 indicates a boat that moves easily through the water without harsh motion, while the capsize screening formula of 2.85 suggests good stability for coastal adventures. The hull speed of 5.2 knots delivers respectable performance for leisurely day sailing and short coastal hops.
This design appeals to traditionalists who appreciate fine craftsmanship, classic aesthetics, and the unique sailing characteristics that only vintage wooden boats can provide. Perfect for sailors seeking an authentic connection to sailing's rich heritage.
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
69.52
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
91.13
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
5.8
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
2.85
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.
5.20 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.
341.08 pounds/inch