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Sailboat Specifications

Diamond 27

Masthead Sloop · Long Keel W/Trans. Hung Rudder

Designed by Alan Buchanan · Built by Thames Marine Ltd, (Uk) · First built 1963

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LOA 27.00 ft  ·  Beam 7.67 ft  ·  Displacement 6,000.00 lb  ·  Sail Area 292  ·  Masthead Sloop  ·  Long Keel W/Trans. Hung Rudder
About the Diamond 27 Sailboat

With limited documentation available, the Diamond 27 represents one of those intriguing sailboats that sailed somewhat under the radar in the recreational boating market. This 27-foot sailboat appears to have been designed as a versatile coastal cruiser, suitable for weekend adventures and day sailing along protected waters and near-shore environments. Based on typical boats of this size category, the Diamond 27 would have been engineered to balance sailing performance with practical accommodations for small crew comfort. The design likely emphasized ease of handling, making it accessible to couples or small families looking to enjoy recreational sailing without the complexity of larger vessels. While comprehensive specifications remain elusive, boats in this size range typically excel at coastal exploration, harbor hopping, and relaxed cruising in moderate conditions. The Diamond 27's modest dimensions would have made it manageable for amateur sailors while still providing enough interior volume for basic overnight capabilities. Without extensive production records or widespread ownership, this model remains something of a mystery in sailing circles. Prospective buyers interested in the Diamond 27 should seek detailed inspections and attempt to connect with previous owners to better understand its sailing characteristics and construction quality.

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 6,000.00 lb / 2,722 kg
Ballast 3,000.00 lb / 1,361 kg
Sail Area (Reported) 292
Design & Construction
Hull Type Long keel w/trans. hung rudder
Rigging Type Masthead Sloop
Construction FG
Designer Alan Buchanan
Builder Thames Marine Ltd, (UK)
First Built 1963
Last Built 1966
Number Built 12
Owner Reviews

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Engine & Accommodations
Horsepower 6
Water Capacity 15 gals / 57 L
Frequently Asked Questions

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

The Diamond 27 has a Sail Area to Displacement ratio (SA/D) of 14.19. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Diamond 27's comfort ratio?

The Diamond 27 has a Ted Brewer Comfort Ratio of 27.58. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Diamond 27 safe for offshore sailing?

The Diamond 27 has a Capsize Screening Formula value of 1.69. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Diamond 27?

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

How much does a Diamond 27 weigh?

The Diamond 27 has a displacement of 6,000.00 lb and a length overall (LOA) of 27.00 ft.

Who designed the Diamond 27?

The Diamond 27 was designed by Alan Buchanan, first built in 1963.