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Sailboat Specifications

J/39

Masthead Sloop · Fin W/Spade Rudder

Designed by Rod Johnstone · First built 1998

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LOA 39.75 ft  ·  Beam 13.00 ft  ·  Displacement 16,500 lb  ·  Sail Area 720 ft²  ·  Masthead Sloop  ·  Fin W/Spade Rudder
About the J/39 Sailboat

Designed by Rod Johnstone and introduced in 1998, the J/39 represents J Boats' commitment to building performance-oriented bluewater cruisers that don't sacrifice speed for comfort. Produced through 2006 with 75 hulls completed, this masthead sloop occupies a compelling niche between serious offshore racer and capable family cruiser. Built with a fiberglass hull, fin keel, and spade rudder, the J/39 is designed for efficiency and responsiveness in a wide range of conditions. Its generous sail area relative to displacement gives it lively performance in light air, while a solid ballast-to-displacement ratio provides reassuring stability when the breeze builds offshore. The comfort ratio sits in a range that suggests a seaworthy, confidence-inspiring ride rather than a spartan racing machine, making it well-suited for extended coastal passages and offshore sailing. With hull speed and upwind performance among its strongest traits, the J/39 appeals to sailors who want to arrive quickly without giving up the amenities of a well-appointed cruiser. Its capsize screening value reflects a stable, capable offshore platform. For buyers seeking a versatile bluewater performer with J Boats' proven pedigree, the J/39 remains a compelling choice on the used market.

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Dimensions & Specifications
LOA (Length Overall) 39.75 ft / 12.12 m
LWL (Waterline Length) 33.50 ft / 10.21 m
Beam 13.00 ft / 3.96 m
Max Draft 6.75 ft / 2.06 m
Displacement 16,500 lb / 7,484 kg
Ballast 6,500 lb / 2,948 kg
Sail Area (Reported) 720 ft² / 66.89 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Rod Johnstone
First Built 1998
Last Built 2006
Number Built 75
Related Sailboats X 402 · Hanse 400 2008 2014 · X4 · Contest 40S · Manta 40
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Frequently Asked Questions

What is the J/39's sail area to displacement ratio?

The J/39 has a Sail Area to Displacement ratio (SA/D) of 16.89. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the J/39's comfort ratio?

The J/39 has a Ted Brewer Comfort Ratio of 33.67. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the J/39 safe for offshore sailing?

The J/39 has a Capsize Screening Formula value of 1.61. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the J/39?

The theoretical hull speed of the J/39 is 9.37 knots, calculated from its waterline length.

How much does a J/39 weigh?

The J/39 has a displacement of 16,500 lb and a length overall (LOA) of 39.75 ft.

Who designed the J/39?

The J/39 was designed by Rod Johnstone, first built in 1998.