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Sirocco 31
Designer: Angus Primrose  ·  Builder: Ballina Marine (Esp)  ·  First built: 1971
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About the Sirocco 31

Designed by renowned British naval architect Angus Primrose and first launched in 1971, this Spanish-built cruiser represents solid European craftsmanship from sailing's golden era. Built by Ballina Marine in fiberglass construction, the Sirocco 31 features a balanced fin keel with rudder on skeg configuration that provides reliable directional stability while maintaining good maneuverability. With a displacement of 6,500 pounds and nearly half that weight carried as ballast, this masthead sloop offers reassuring stability for coastal and offshore passages. The boat's conservative sail area to displacement ratio of 14.52 indicates she's built more for comfort and seaworthiness than racing performance, while her low capsize screening value of 1.99 speaks to inherent safety margins that inspire confidence in challenging conditions. The Sirocco 31's moderate beam of 9.25 feet strikes an appealing balance between interior space and sailing performance, while her 5.5-foot draft provides good windward ability without limiting access to many harbors. Her comfort ratio of 19.88 suggests motion that's manageable for extended cruising, making this design well-suited for sailors seeking a reliable, traditional cruising yacht capable of handling both weekend coastal hops and longer passages with equal competence.

Core Dimensions
LOA (Length Overall) 31.00 ft / 9.45 m
LWL (Waterline Length) 24.00 ft / 7.32 m
Beam 9.25 ft / 2.82 m
Max Draft 5.50 ft / 1.68 m
Displacement 6,500.00 lb / 2,948 kg
Ballast 3,040.00 lb / 1,379 kg
Sail Area (Reported) 315.00 ft² / 29.26 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG
Designer Angus Primrose
Builder Ballina Marine (ESP)
First Built 1971
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
 14.52
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
 46.77
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
 209.91
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
 19.88
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
 1.99
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. 6.56 kn
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. 793.23 pounds/inch
Engine & Accommodations
Engine Make Volvo Penta
Engine Type Diesel
Horsepower 10
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