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Sailboat Specifications

Lapworth 40

Masthead Sloop · Fin Keel

Designed by C. William Lapworth · First built 1960

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LOA 40.00 ft  ·  Beam 11.00 ft  ·  Displacement 17,800.00 lb  ·  Sail Area 669.00 ft²  ·  Masthead Sloop  ·  Fin Keel
About the Lapworth 40 Sailboat

Designed by renowned naval architect Bill Lapworth in the early 1970s, this 40-foot sailboat represents a thoughtful approach to bluewater cruising during an era when production boats were becoming increasingly sophisticated. Lapworth, who gained fame for his work on Cal boats and other West Coast designs, brought his expertise in creating seaworthy yet performance-oriented vessels to this model. While detailed specifications remain scarce, the boat's lineage suggests a design philosophy emphasizing ocean-going capability without sacrificing sailing performance. Lapworth's reputation for creating boats that could handle serious offshore passages while remaining manageable for smaller crews likely carried through to this design. The boat appears well-suited for coastal cruising and extended offshore voyages, appealing to sailors seeking adventure beyond protected waters. Built during the height of the fiberglass revolution, the Lapworth 40 would have incorporated the construction techniques and materials that were becoming standard for quality cruising boats of the era. For prospective buyers researching classic cruising sailboats, this model represents an interesting piece of sailing history from one of California's most respected yacht designers, though finding examples and comprehensive documentation may require dedicated searching.

Dimensions & Specifications
LOA (Length Overall) 40.00 ft / 12.19 m
LWL (Waterline Length) 28.00 ft / 8.53 m
Beam 11.00 ft / 3.35 m
Max Draft 5.50 ft / 1.68 m
Displacement 17,800.00 lb / 8,074 kg
Sail Area (Reported) 669.00 ft² / 62.15 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Masthead Sloop
Construction Wood
Designer C. William Lapworth
First Built 1960
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Frequently Asked Questions

What is the Lapworth 40's sail area to displacement ratio?

The Lapworth 40 has a Sail Area to Displacement ratio (SA/D) of 15.76. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Lapworth 40's comfort ratio?

The Lapworth 40 has a Ted Brewer Comfort Ratio of 35.71. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Lapworth 40 safe for offshore sailing?

The Lapworth 40 has a Capsize Screening Formula value of 1.69. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Lapworth 40?

The theoretical hull speed of the Lapworth 40 is 7.09 knots, calculated from its waterline length.

How much does a Lapworth 40 weigh?

The Lapworth 40 has a displacement of 17,800.00 lb and a length overall (LOA) of 40.00 ft.

Who designed the Lapworth 40?

The Lapworth 40 was designed by C. William Lapworth, first built in 1960.