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Discus 33 Westerly
Designer: Laurent Giles  ·  Builder: Westerly Yachts Ltd.  ·  First built: 1979
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About the Discus 33 Westerly

Built by the respected British yard Westerly Marine, this 33-foot sailboat represents the company's commitment to producing solid, seaworthy cruising yachts during their prolific manufacturing years. Westerly earned a strong reputation among sailors for building boats that could handle challenging conditions while remaining accessible to cruising families. The Discus 33 embodies the practical design philosophy that made Westerly boats popular with coastal and offshore cruisers. Like other vessels in the Westerly lineup, this model likely features a robust fiberglass construction with a focus on durability rather than racing performance. The design emphasizes comfortable accommodations and reliable sailing characteristics that inspire confidence in various weather conditions. This yacht suits sailors seeking a dependable platform for extended coastal cruising or cross-channel passages. Westerly's reputation for building boats that maintain their value and structural integrity over decades makes models like the Discus 33 attractive options in the used boat market. While not designed for competitive racing, the boat offers the kind of steady, predictable sailing experience that appeals to cruising sailors who prioritize safety and comfort over speed.

Core Dimensions
LOA (Length Overall) 33.27 ft / 10.14 m
LWL (Waterline Length) 28.48 ft / 8.68 m
Beam 11.16 ft / 3.40 m
Max Draft 5.45 ft / 1.66 m
Displacement 15,097.00 lb / 6,848 kg
Ballast 6,047.00 lb / 2,743 kg
Sail Area (Reported) 526.14 ft² / 48.88 m²
Design & Construction
Hull Type Fin w/rudder on partial skeg
Rigging Type Masthead Sloop
Construction FG
Designer Laurent Giles
Builder Westerly Yachts Ltd.
First Built 1979
Last Built 1984
Owner Reviews

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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
13.83
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
31.38
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
1.81
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. 7.15
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. 1.0
How It Compares

vs. Dehler 34, Grand Soleil 34 Finot, Moody 34

This boat Similar boats
Dimensions
LOA
Discus 33 Westerly ★
33.3 ft
Dehler 34
33.1 ft
Grand Soleil 34 Finot
33.4 ft
Moody 34
33.4 ft
LWL
Discus 33 Westerly ★
28.5 ft
Dehler 34
27.2 ft
Grand Soleil 34 Finot
27.0 ft
Moody 34
27.8 ft
Beam
Discus 33 Westerly ★
11.2 ft
Dehler 34
11.2 ft
Grand Soleil 34 Finot
11.3 ft
Moody 34
11.7 ft
Displacement
Discus 33 Westerly ★
15 lbs
Dehler 34
8 lbs
Grand Soleil 34 Finot
9 lbs
Moody 34
11 lbs
Ballast
Discus 33 Westerly ★
6 lbs
Dehler 34
3 lbs
Grand Soleil 34 Finot
3 lbs
Moody 34
4 lbs
Sail Area
Discus 33 Westerly ★
526 sq ft
Dehler 34
492 sq ft
Grand Soleil 34 Finot
Moody 34
Performance
PHRF Rating (lower = faster)
Discus 33 Westerly ★
Dehler 34
132 s/nm
Grand Soleil 34 Finot
Moody 34
168 s/nm
SA / Displacement (higher = more powerful)
Discus 33 Westerly ★
13.8
Dehler 34
18.5
Grand Soleil 34 Finot
Moody 34
Ballast / Disp (higher = stiffer)
Discus 33 Westerly ★
Dehler 34
45.0 %
Grand Soleil 34 Finot
35.6 %
Moody 34
40.2 %
Comfort Ratio (higher = more comfortable offshore)
Discus 33 Westerly ★
31.4
Dehler 34
18.9
Grand Soleil 34 Finot
Moody 34
Capsize Screening (lower = safer)
Discus 33 Westerly ★
1.81
Dehler 34
2.16
Grand Soleil 34 Finot
Moody 34
Displacement / Length (lower = lighter)
Discus 33 Westerly ★
Dehler 34
194
Grand Soleil 34 Finot
224
Moody 34
Hull Speed
Discus 33 Westerly ★
7.2 kts
Dehler 34
7.0 kts
Grand Soleil 34 Finot
Moody 34
Speed Number (higher = faster)
Discus 33 Westerly ★
Dehler 34
2.9
Grand Soleil 34 Finot
Moody 34
2.3
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