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Sailboat Specifications

Mariner 31

Masthead Ketch · Long Keel

Designed by C. Oberly · Built by Far East Yachts · First built 1968

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LOA 30.67 ft  ·  Beam 9.75 ft  ·  Displacement 11,500.00 lb  ·  Sail Area 482.00 ft²  ·  Masthead Ketch  ·  Long Keel
About the Mariner 31 Sailboat

With limited documentation available, the Mariner 31 represents one of the more elusive designs in the 31-foot sailing category. This mid-sized sailboat appears to have been produced during an era when manufacturers were experimenting with various hull configurations and construction methods to appeal to the growing recreational sailing market. Based on its length and the typical design philosophy of boats bearing the "Mariner" name, this vessel likely embodies characteristics suited for coastal cruising and weekend sailing adventures. The 31-foot length suggests a boat designed to balance manageable size with reasonable interior accommodations, making it potentially attractive to couples or small families seeking their first serious cruising sailboat. Without extensive specification data, the Mariner 31's exact performance characteristics and design pedigree remain somewhat mysterious to modern boat researchers. This scarcity of information may reflect limited production numbers or a shorter manufacturing run. For prospective buyers encountering this model, thorough inspection becomes particularly important given the limited available technical documentation. Any examples still sailing today would represent survivors from what appears to have been a relatively uncommon design in the competitive 31-foot market segment.

Dimensions & Specifications
LOA (Length Overall) 30.67 ft / 9.35 m
LWL (Waterline Length) 25.50 ft / 7.77 m
Beam 9.75 ft / 2.97 m
Max Draft 3.67 ft / 1.12 m
Displacement 11,500.00 lb / 5,216 kg
Ballast 5,000.00 lb / 2,268 kg
Sail Area (Reported) 482.00 ft² / 44.78 m²
Design & Construction
Hull Type Long Keel
Rigging Type Masthead Ketch
Construction FG with wood deck and cabin
Designer C. Oberly
Builder Far East Yachts
First Built 1968
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Frequently Asked Questions

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

The Mariner 31 has a Sail Area to Displacement ratio (SA/D) of 15.19. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Mariner 31's comfort ratio?

The Mariner 31 has a Ted Brewer Comfort Ratio of 31.64. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Mariner 31 safe for offshore sailing?

The Mariner 31 has a Capsize Screening Formula value of 1.73. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Mariner 31?

The theoretical hull speed of the Mariner 31 is 6.77 knots, calculated from its waterline length.

How much does a Mariner 31 weigh?

The Mariner 31 has a displacement of 11,500.00 lb and a length overall (LOA) of 30.67 ft.

Who designed the Mariner 31?

The Mariner 31 was designed by C. Oberly, first built in 1968.