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Sailboat Specifications

Halcyon 27

Masthead Sloop · Long Keel W/Trans. Hung Rudder

Designed by Alan Buchanan · Built by Offshore Yachts Ltd. (Uk) · First built 1968

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LOA 27.00 ft  ·  Beam 7.67 ft  ·  Displacement 6,720.00 lb  ·  Sail Area 290.00 ft²  ·  Masthead Sloop  ·  Long Keel W/Trans. Hung Rudder
About the Halcyon 27 Sailboat

Built by Offshore Yachts Ltd. in the UK from 1968 to 1975, this Alan Buchanan-designed 27-footer represents classic British cruising yacht philosophy with its traditional long keel configuration and transom-hung rudder. The Halcyon 27's substantial 6,720-pound displacement and generous 3,000-pound ballast provide exceptional stability and seaworthiness, making her well-suited for serious coastal cruising and moderate offshore passages. Her masthead sloop rig carries 290 square feet of working sail area, delivering respectable performance while remaining manageable for a small crew. The long keel design offers excellent tracking and directional stability in heavy weather, though at the expense of some maneuverability in tight quarters. With a comfort ratio of 30.89, she falls into the heavy displacement category that prioritizes seakeeping ability over speed. The boat's conservative capsize screening formula of 1.63 indicates good offshore capability, while her 6.03-knot hull speed provides adequate passage-making performance. Originally fitted with modest 7-horsepower auxiliary power, the Halcyon 27 appeals to sailors who value traditional sailing characteristics and proven seaworthiness over modern high-performance attributes. Her fiberglass construction ensures durability while maintaining the classic lines of her era.

Dimensions & Specifications
LOA (Length Overall) 27.00 ft / 8.23 m
LWL (Waterline Length) 20.25 ft / 6.17 m
Beam 7.67 ft / 2.34 m
Max Draft 4.00 ft / 1.22 m
Displacement 6,720.00 lb / 3,048 kg
Ballast 3,000.00 lb / 1,361 kg
Sail Area (Reported) 290.00 ft² / 26.94 m²
Design & Construction
Hull Type Long keel w/trans. hung rudder
Rigging Type Masthead Sloop
Construction FG
Designer Alan Buchanan
Builder Offshore Yachts Ltd. (UK)
First Built 1968
Last Built 1975
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Engine & Accommodations
Engine Make Wickstrom
Engine Type Gas
Horsepower 7
Frequently Asked Questions

What is the Halcyon 27's sail area to displacement ratio?

The Halcyon 27 has a Sail Area to Displacement ratio (SA/D) of 13.07. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Halcyon 27's comfort ratio?

The Halcyon 27 has a Ted Brewer Comfort Ratio of 30.89. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Halcyon 27 safe for offshore sailing?

The Halcyon 27 has a Capsize Screening Formula value of 1.63. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Halcyon 27?

The theoretical hull speed of the Halcyon 27 is 6.03 kn knots, calculated from its waterline length.

How much does a Halcyon 27 weigh?

The Halcyon 27 has a displacement of 6,720.00 lb and a length overall (LOA) of 27.00 ft.

Who designed the Halcyon 27?

The Halcyon 27 was designed by Alan Buchanan, first built in 1968.