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Sailboat Specifications

Jouster 21 Westerly

Fractional Sloop · Fin W/Transom Hung Rudder

Designed by Laurent Giles · Built by Westerly Marine Ltd. · First built 1970

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LOA 21.00 ft  ·  Beam 7.50 ft  ·  Displacement 2,200.00 lb  ·  Sail Area 210.00 ft²  ·  Fractional Sloop  ·  Fin W/Transom Hung Rudder
About the Jouster 21 Westerly Sailboat

Built by the respected British yard Westerly Marine, this compact 21-footer represents solid coastal cruising capabilities in a manageable package. Known for their robust construction methods and seaworthy designs, Westerly applied their proven approach to smaller craft with the Jouster series. The boat's modest dimensions make it an excellent choice for day sailing and weekend coastal adventures, particularly appealing to sailors seeking a vessel they can handle short-handed or use for sailing instruction. Westerly's reputation for building boats that punch above their weight class likely extends to this model, suggesting reliable performance in varied conditions. As with most Westerly designs from this era, the Jouster 21 probably features a traditional layout optimized for practical sailing rather than racing performance. The boat would suit sailors looking for their first keelboat or those wanting a smaller vessel for local waters without sacrificing the build quality associated with the Westerly name. While detailed specifications remain elusive, the combination of Westerly's engineering heritage and the boat's size category suggests a well-balanced design suitable for developing sailing skills and enjoying coastal waters with confidence.

Dimensions & Specifications
LOA (Length Overall) 21.00 ft / 6.40 m
LWL (Waterline Length) 18.25 ft / 5.56 m
Beam 7.50 ft / 2.29 m
Max Draft 3.50 ft / 1.07 m
Displacement 2,200.00 lb / 998 kg
Ballast 950.00 lb / 431 kg
Sail Area (Reported) 210.00 ft² / 19.51 m²
Design & Construction
Hull Type Fin w/transom hung rudder
Rigging Type Fractional Sloop
Construction FG
Designer Laurent Giles
Builder Westerly Marine Ltd.
First Built 1970
Last Built 1975
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Frequently Asked Questions

What is the Jouster 21 Westerly's sail area to displacement ratio?

The Jouster 21 Westerly has a Sail Area to Displacement ratio (SA/D) of 19.91. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Jouster 21 Westerly's comfort ratio?

The Jouster 21 Westerly has a Ted Brewer Comfort Ratio of 12.17. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Jouster 21 Westerly safe for offshore sailing?

The Jouster 21 Westerly has a Capsize Screening Formula value of 2.31. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Jouster 21 Westerly?

The theoretical hull speed of the Jouster 21 Westerly is 5.72 knots, calculated from its waterline length.

How much does a Jouster 21 Westerly weigh?

The Jouster 21 Westerly has a displacement of 2,200.00 lb and a length overall (LOA) of 21.00 ft.

Who designed the Jouster 21 Westerly?

The Jouster 21 Westerly was designed by Laurent Giles, first built in 1970.