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Sailboat Specifications

Seafarer 31 Mki

Masthead Sloop · Fin With Rudder On Skeg

Designed by William Tripp Jr. · Built by Seafarer Fiberglass Yachts Inc. · First built 1968

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LOA 31.16 ft  ·  Beam 8.83 ft  ·  Displacement 8,750.00 lb  ·  Sail Area 417.00 ft²  ·  Masthead Sloop  ·  Fin With Rudder On Skeg
About the Seafarer 31 Mki Sailboat

A classic production sailboat from the mid-twentieth century American market, the Seafarer 31 MkI represents an era when builders were focused on delivering capable, accessible cruising boats to a growing recreational sailing community. Designed with coastal and inland cruising in mind, this vessel offers a practical platform for sailors looking to explore sheltered waters and make moderate offshore passages with confidence. With its traditional hull form and conservative design philosophy typical of its period, the Seafarer 31 MkI tends to appeal to sailors who value steady, predictable handling over high-performance sailing. The boat carries a reputation for solid construction and a comfortable motion at sea, qualities that made Seafarer vessels popular among weekend cruisers and liveaboards during their production run. For anyone researching this model, it is worth noting that examples vary considerably depending on age and maintenance history, making a thorough survey essential before purchase. Spare parts and rigging components may require sourcing from specialty suppliers, though the dedicated community of Seafarer owners can be a valuable resource for guidance and support.

Dimensions & Specifications
LOA (Length Overall) 31.16 ft / 9.50 m
LWL (Waterline Length) 22.33 ft / 6.81 m
Beam 8.83 ft / 2.69 m
Max Draft 4.50 ft / 1.37 m
Displacement 8,750.00 lb / 3,969 kg
Ballast 3,400.00 lb / 1,542 kg
Sail Area (Reported) 417.00 ft² / 38.74 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG (solid hull/balsa cored deck)
Designer William Tripp Jr.
Builder Seafarer Fiberglass Yachts Inc.
First Built 1968
Last Built 1974
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Frequently Asked Questions

What is the Seafarer 31 Mki's sail area to displacement ratio?

The Seafarer 31 Mki 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 Seafarer 31 Mki's comfort ratio?

The Seafarer 31 Mki has a Ted Brewer Comfort Ratio of 29.74. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Seafarer 31 Mki safe for offshore sailing?

The Seafarer 31 Mki has a Capsize Screening Formula value of 1.72. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Seafarer 31 Mki?

The theoretical hull speed of the Seafarer 31 Mki is 6.33 knots, calculated from its waterline length.

How much does a Seafarer 31 Mki weigh?

The Seafarer 31 Mki has a displacement of 8,750.00 lb and a length overall (LOA) of 31.16 ft.

Who designed the Seafarer 31 Mki?

The Seafarer 31 Mki was designed by William Tripp Jr., first built in 1968.