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Calkins 40
Designer: Wendell H. Calkins  ·  Builder: American Marine Pte  ·  First built: 1963
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About the Calkins 40

With limited documentation available, the Calkins 40 represents one of the more elusive designs in the 40-foot sailboat category. This relative obscurity in the sailing world suggests it was likely produced in small numbers, making it a rare find for those seeking something distinctive on the water. Based on its 40-foot length, this boat would fall into the category suitable for serious coastal cruising and potentially limited offshore passages. Boats of this size typically offer a good balance between manageable handling for smaller crews and sufficient space for extended cruising comfort. The Calkins name, while not as widely recognized as some major production builders, indicates this was likely a custom or semi-custom design, suggesting attention to quality construction and potentially unique design characteristics. For prospective buyers encountering a Calkins 40, the limited available information means conducting a thorough survey becomes even more critical. The rarity factor could work both ways – while finding replacement parts or specific technical support might prove challenging, owning a lesser-known design offers the appeal of sailing something truly uncommon. Anyone considering this boat should focus heavily on the individual vessel's condition and maintenance history rather than relying on fleet-wide reputation data.

Core Dimensions
LOA (Length Overall) 39.92 ft / 12.17 m
LWL (Waterline Length) 35.00 ft / 10.67 m
Beam 10.42 ft / 3.18 m
Max Draft 6.42 ft / 1.96 m
Displacement 18,000.00 lb / 8,165 kg
Ballast 5,000.00 lb / 2,268 kg
Sail Area (Reported) 751.00 ft² / 69.77 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction Wood (strip planked mahogany)
Designer Wendell H. Calkins
Builder American Marine PTE
First Built 1963
Owner Reviews

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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
17.56
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
33.62
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
1.59
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. 7.93
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. 1.0
How It Compares

vs. Endeavour 40, Pearson 40, Tartan 40 Offshore

This boat Similar boats
Dimensions
LOA
Calkins 40 ★
39.9 ft
Endeavour 40
40.0 ft
Pearson 40
39.9 ft
Tartan 40 Offshore
40.0 ft
LWL
Calkins 40 ★
35.0 ft
Endeavour 40
32.0 ft
Pearson 40
31.3 ft
Tartan 40 Offshore
36.0 ft
Beam
Calkins 40 ★
10.4 ft
Endeavour 40
13.0 ft
Pearson 40
12.5 ft
Tartan 40 Offshore
13.3 ft
Displacement
Calkins 40 ★
18 lbs
Endeavour 40
25 lbs
Pearson 40
22 lbs
Tartan 40 Offshore
26 lbs
Ballast
Calkins 40 ★
5 lbs
Endeavour 40
9 lbs
Pearson 40
12 lbs
Tartan 40 Offshore
10 lbs
Sail Area
Calkins 40 ★
751 sq ft
Endeavour 40
788 sq ft
Pearson 40
Tartan 40 Offshore
788 sq ft
Performance
PHRF Rating (lower = faster)
Calkins 40 ★
Endeavour 40
147 s/nm
Pearson 40
117 s/nm
Tartan 40 Offshore
SA / Displacement (higher = more powerful)
Calkins 40 ★
17.6
Endeavour 40
14.8
Pearson 40
Tartan 40 Offshore
14.4
Ballast / Disp (higher = stiffer)
Calkins 40 ★
Endeavour 40
36.0 %
Pearson 40
53.5 %
Tartan 40 Offshore
Comfort Ratio (higher = more comfortable offshore)
Calkins 40 ★
33.6
Endeavour 40
36.9
Pearson 40
Tartan 40 Offshore
34.3
Capsize Screening (lower = safer)
Calkins 40 ★
1.59
Endeavour 40
1.78
Pearson 40
Tartan 40 Offshore
1.80
Displacement / Length (lower = lighter)
Calkins 40 ★
Endeavour 40
340
Pearson 40
333
Tartan 40 Offshore
Hull Speed
Calkins 40 ★
7.9 kts
Endeavour 40
7.6 kts
Pearson 40
Tartan 40 Offshore
8.0 kts
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