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Diamond 27
Designer: Alan Buchanan  ·  Builder: Thames Marine Ltd, (Uk)  ·  First built: 1963
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About the Diamond 27

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.

Core Dimensions
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
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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Performance Ratios
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
50.0
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
322.57
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. 3.33 pounds/inch
Rig Dimensions
I (Foretriangle Height) 14.19
J (Foretriangle Base) 10.00 ft / 3.05 m
P (Mainsail Luff) 292.00 ft² / 27.13 m²
E (Mainsail Foot) Vire
Engine & Accommodations
Horsepower 6
Water Capacity 15 gals / 57 L
How It Compares

vs. Cutlass 27, Dufour Safari 27, Folkdancer 27, Halcyon 27, Tartan 27

This boat Similar boats
Dimensions
LOA
Diamond 27 ★
27.0 ft
Cutlass 27
27.0 ft
Dufour Safari 27
27.0 ft
Folkdancer 27
27.0 ft
Halcyon 27
27.0 ft
Tartan 27
27.0 ft
LWL
Diamond 27 ★
20.3 ft
Cutlass 27
20.0 ft
Dufour Safari 27
21.5 ft
Folkdancer 27
19.7 ft
Halcyon 27
20.3 ft
Tartan 27
21.4 ft
Beam
Diamond 27 ★
7.7 ft
Cutlass 27
7.7 ft
Dufour Safari 27
9.2 ft
Folkdancer 27
7.5 ft
Halcyon 27
7.7 ft
Tartan 27
8.6 ft
Displacement
Diamond 27 ★
6 lbs
Cutlass 27
6 lbs
Dufour Safari 27
5 lbs
Folkdancer 27
5 lbs
Halcyon 27
6 lbs
Tartan 27
7 lbs
Ballast
Diamond 27 ★
3 lbs
Cutlass 27
3 lbs
Dufour Safari 27
2 lbs
Folkdancer 27
2 lbs
Halcyon 27
3 lbs
Tartan 27
2 lbs
Sail Area
Diamond 27 ★
Cutlass 27
Dufour Safari 27
Folkdancer 27
264 sq ft
Halcyon 27
290 sq ft
Tartan 27
Performance
PHRF Rating (lower = faster)
Diamond 27 ★
Cutlass 27
Dufour Safari 27
204 s/nm
Folkdancer 27
Halcyon 27
Tartan 27
234 s/nm
SA / Displacement (higher = more powerful)
Diamond 27 ★
Cutlass 27
Dufour Safari 27
Folkdancer 27
14.4
Halcyon 27
13.1
Tartan 27
Ballast / Disp (higher = stiffer)
Diamond 27 ★
50.0 %
Cutlass 27
50.0 %
Dufour Safari 27
37.0 %
Folkdancer 27
Halcyon 27
44.6 %
Tartan 27
32.4 %
Comfort Ratio (higher = more comfortable offshore)
Diamond 27 ★
Cutlass 27
Dufour Safari 27
Folkdancer 27
24.3
Halcyon 27
30.9
Tartan 27
Capsize Screening (lower = safer)
Diamond 27 ★
Cutlass 27
Dufour Safari 27
Folkdancer 27
1.75
Halcyon 27
1.63
Tartan 27
Displacement / Length (lower = lighter)
Diamond 27 ★
322
Cutlass 27
362
Dufour Safari 27
266
Folkdancer 27
Halcyon 27
361
Tartan 27
336
Hull Speed
Diamond 27 ★
Cutlass 27
Dufour Safari 27
Folkdancer 27
5.9 kts
Halcyon 27
6.0 kts
Tartan 27
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