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Sailboat Specifications

Seamaster 47

Staysail Ketch · Fin Keel

Built by Seamaster · First built 1977

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LOA 47.16 ft  ·  Beam 13.25 ft  ·  Displacement 27,308.00 lb  ·  Sail Area 680.00 ft²  ·  Staysail Ketch  ·  Fin Keel
About the Seamaster 47 Sailboat

Bearing the trusted Seamaster name, the Seamaster 47 is a substantial bluewater cruising sailboat designed with serious passage-making in mind. Built for sailors who want to venture well beyond coastal waters, this vessel carries the kind of size and presence that inspires confidence on extended offshore voyages, whether crossing an ocean or island-hopping through remote cruising grounds. While detailed specifications for this model are limited, the Seamaster line has historically been associated with sturdy, capable construction intended to handle demanding conditions at sea. A boat of this size typically offers generous interior volume, making it well-suited for liveaboard cruising or lengthy passages where comfort and self-sufficiency matter as much as performance. Buyers drawn to this model are likely prioritizing seakeeping ability and range over racing credentials. For anyone researching the Seamaster 47 as a potential purchase, connecting with current owners and seeking out a thorough survey is particularly worthwhile given the limited publicly available data. Hands-on evaluation will reveal the most about her construction quality, layout, and overall condition — all essential considerations for a boat intended to take you far from shore.

Dimensions & Specifications
LOA (Length Overall) 47.16 ft / 14.37 m
LWL (Waterline Length) 34.00 ft / 10.36 m
Beam 13.25 ft / 4.04 m
Max Draft 5.08 ft / 1.55 m
Displacement 27,308.00 lb / 12,387 kg
Ballast 8,808.00 lb / 3,995 kg
Sail Area (Reported) 680.00 ft² / 63.17 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Staysail Ketch
Construction FG w/balsa cored deck
Builder Seamaster
First Built 1977
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Frequently Asked Questions

What is the Seamaster 47's sail area to displacement ratio?

The Seamaster 47 has a Sail Area to Displacement ratio (SA/D) of 12.05. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Seamaster 47's comfort ratio?

The Seamaster 47 has a Ted Brewer Comfort Ratio of 35.62. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Seamaster 47 safe for offshore sailing?

The Seamaster 47 has a Capsize Screening Formula value of 1.76. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Seamaster 47?

The theoretical hull speed of the Seamaster 47 is 7.81 knots, calculated from its waterline length.

How much does a Seamaster 47 weigh?

The Seamaster 47 has a displacement of 27,308.00 lb and a length overall (LOA) of 47.16 ft.