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Rustler 31
Designer: Holman & Pye  ·  Builder: Russell Anstey Yachts (Uk)  ·  First built: 1965
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About the Rustler 31

Designed by the renowned British firm Holman & Pye and built by Russell Anstey Yachts, this classic 31-footer represents traditional British yacht design from the mid-1960s. With only 50 hulls produced during its production run beginning in 1965, the Rustler 31 has earned a reputation as a capable offshore cruiser built to exacting standards. The boat's long keel configuration with transom-hung rudder provides excellent directional stability and seakindly motion in rough conditions, making it well-suited for extended coastal cruising and offshore passages. At 12,768 pounds displacement, this substantial yacht offers the weight and momentum needed to punch through seas comfortably. The masthead sloop rig with 440 square feet of sail area provides adequate power while remaining manageable for short-handed sailing. Built from fiberglass construction, the Rustler 31 benefits from the durability and low maintenance requirements of modern materials while retaining classic design proportions. The comfort ratio of 40.3 indicates a motion that prioritizes seaworthiness over speed, while the capsize screening value of 1.54 suggests good stability characteristics for offshore work. Hull speed calculations indicate a theoretical maximum of 6.56 knots, typical for displacement cruisers of this era prioritizing comfort and safety over performance.

Core Dimensions
LOA (Length Overall) 31.42 ft / 9.58 m
LWL (Waterline Length) 24.00 ft / 7.32 m
Beam 9.00 ft / 2.74 m
Max Draft 5.50 ft / 1.68 m
Displacement 12,768.00 lb / 5,791 kg
Sail Area (Reported) 440.00 ft² / 40.88 m²
Design & Construction
Hull Type Long keel w/trans. hung rudder
Rigging Type Masthead Sloop
Construction FG
Designer Holman & Pye
Builder Russell Anstey Yachts (UK)
First Built 1965
Number Built 50
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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
 12.93
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
 412.33
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
 40.3
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
 1.54
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. 771.79 pounds/inch
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