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Sailboat Specifications

J/45

Masthead Sloop · Fin W/Spade Rudder

Designed by Alan Johnstone · First built 2020

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LOA 45.58 ft  ·  Beam 14.08 ft  ·  Displacement 24,000 lb  ·  Sail Area 989 ft²  ·  Masthead Sloop  ·  Fin W/Spade Rudder
Dimensions & Specifications
LOA (Length Overall) 45.58 ft / 13.89 m
LWL (Waterline Length) 39.00 ft / 11.89 m
Beam 14.08 ft / 4.29 m
Max Draft 7.25 ft / 2.21 m
Displacement 24,000 lb / 10,886 kg
Ballast 10,000 lb / 4,536 kg
Sail Area (Reported) 989 ft² / 91.88 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Alan Johnstone
First Built 2020
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Frequently Asked Questions

What is the J/45's sail area to displacement ratio?

The J/45 has a Sail Area to Displacement ratio (SA/D) of 17.21. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the J/45's comfort ratio?

The J/45 has a Ted Brewer Comfort Ratio of 35.94. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the J/45 safe for offshore sailing?

The J/45 has a Capsize Screening Formula value of 1.55. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the J/45?

The theoretical hull speed of the J/45 is 10.48 knots, calculated from its waterline length.

How much does a J/45 weigh?

The J/45 has a displacement of 24,000 lb and a length overall (LOA) of 45.58 ft.

Who designed the J/45?

The J/45 was designed by Alan Johnstone, first built in 2020.