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Jouster 21 Westerly
Designer: Laurent Giles  ·  Builder: Westerly Marine Ltd.  ·  First built: 1970
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About the Jouster 21 Westerly

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.

Core Dimensions
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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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
19.91
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
12.17
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
2.31
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 5.72
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 489.07
How It Compares

vs. Clipper Marine 21, Snapdragon 21, Varianta

This boat Similar boats
Dimensions
LOA
Jouster 21 Westerly ★
21.0 ft
Clipper Marine 21
20.9 ft
Snapdragon 21
21.0 ft
Varianta
21.0 ft
LWL
Jouster 21 Westerly ★
18.3 ft
Clipper Marine 21
16.7 ft
Snapdragon 21
18.0 ft
Varianta
17.7 ft
Beam
Jouster 21 Westerly ★
7.5 ft
Clipper Marine 21
7.3 ft
Snapdragon 21
7.3 ft
Varianta
6.9 ft
Displacement
Jouster 21 Westerly ★
2 lbs
Clipper Marine 21
1 lbs
Snapdragon 21
2 lbs
Varianta
1 lbs
Ballast
Jouster 21 Westerly ★
950 lbs
Clipper Marine 21
410 lbs
Snapdragon 21
950 lbs
Varianta
573 lbs
Sail Area
Jouster 21 Westerly ★
210 sq ft
Clipper Marine 21
192 sq ft
Snapdragon 21
188 sq ft
Varianta
Performance
SA / Displacement (higher = more powerful)
Jouster 21 Westerly ★
19.9
Clipper Marine 21
20.8
Snapdragon 21
17.8
Varianta
Comfort Ratio (higher = more comfortable offshore)
Jouster 21 Westerly ★
12.2
Clipper Marine 21
11.1
Snapdragon 21
12.9
Varianta
Capsize Screening (lower = safer)
Jouster 21 Westerly ★
2.31
Clipper Marine 21
2.39
Snapdragon 21
2.23
Varianta
Hull Speed
Jouster 21 Westerly ★
5.7 kts
Clipper Marine 21
5.5 kts
Snapdragon 21
5.7 kts
Varianta
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