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Heavenly Twins
Designer: Pat Patterson  ·  Builder: Heavenly Cruising Yachts Ltd. (Uk)  ·  First built: 1971
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About the Heavenly Twins

Designed by Pat Patterson and launched in 1971, this British-built catamaran represents an early entry into the production multihull market. Heavenly Cruising Yachts Ltd. constructed these fiberglass vessels with a focus on comfortable coastal cruising and moderate performance sailing. The Heavenly Twins features a beamy 13.75-foot width that provides exceptional stability and spacious accommodations for its 27-foot length. With a shallow 2.25-foot draft, this catamaran excels in exploring thin waters, anchorages, and coastal areas that would challenge deeper-draft monohulls. The masthead sloop rig carries 380 square feet of sail area, delivering respectable performance while remaining manageable for small crews. At 6,285 pounds displacement, the design strikes a balance between structural integrity and sailing efficiency. The SA/Displacement ratio of 17.91 indicates moderate performance characteristics well-suited to relaxed cruising rather than racing applications. Twin 9-horsepower engines provide adequate auxiliary power and excellent maneuverability in tight quarters. This catamaran appeals most to sailors seeking stable, shoal-draft cruising capabilities with the comfort and space advantages inherent to multihull design. The Heavenly Twins works best for protected waters, coastal exploration, and weekend cruising where comfort takes precedence over ultimate speed.

Core Dimensions
LOA (Length Overall) 27.00 ft / 8.23 m
LWL (Waterline Length) 21.50 ft / 6.55 m
Beam 13.75 ft / 4.19 m
Max Draft 2.25 ft / 0.69 m
Displacement 6,285.40 lb / 2,851 kg
Sail Area (Reported) 380.00 ft² / 35.30 m²
Design & Construction
Hull Type Catamaran (no boards/asym.)
Rigging Type Masthead Sloop
Construction FG
Designer Pat Patterson
Builder Heavenly Cruising Yachts Ltd. (UK)
First Built 1971
Associations Heavenly Twins and Cruising Catamaran Association
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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
17.91
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
12.69
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
2.98
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. 6.21 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. 6.33 pounds/inch
Engine & Accommodations
Engine Make Yanmar
Engine Model 1GM10
Engine Type Diesel
Horsepower 2x 9
Fuel Capacity 24 gals / 90 L
Water Capacity 62 gals / 234 L
KSP 0.57
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