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Chieftain 26 Westerly
Designer: Laurent Giles  ·  Builder: Westerly Marine Ltd. (Uk)  ·  First built: 1972
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About the Chieftain 26 Westerly

Built during the mid-1970s by Westerly Marine, the Chieftain 26 represents a classic example of British coastal cruising design from the Laurent Giles drawing board. With only 79 hulls produced between 1972 and 1976, this fiberglass sloop has become a sought-after vintage yacht among sailors who appreciate traditional sailing characteristics. The boat's most distinctive feature is its twin keel configuration, which offers significant practical advantages for coastal cruising. This setup allows the vessel to sit upright when dried out in tidal harbors, making it ideal for exploring shallow bays and anchorages inaccessible to deep-draft boats. The twin keels also provide excellent directional stability while reducing the overall draft to just three feet. With a displacement of 6,700 pounds and 2,800 pounds of ballast, the Chieftain 26 delivers the solid, seaworthy feel characteristic of Westerly's construction philosophy. The masthead sloop rig with 325 square feet of sail area provides adequate power for coastal passages while remaining manageable for short-handed sailing. Her comfort ratio of 26.66 indicates a motion suited to extended cruising, while the hull speed of 6.19 knots reflects respectable performance for weekend adventures and coastal exploration along Britain's challenging coastlines.

Core Dimensions
LOA (Length Overall) 26.00 ft / 7.92 m
LWL (Waterline Length) 21.33 ft / 6.50 m
Beam 8.42 ft / 2.57 m
Max Draft 3.00 ft / 0.91 m
Displacement 6,700.00 lb / 3,039 kg
Ballast 2,800.00 lb / 1,270 kg
Sail Area (Reported) 325.00 ft² / 30.19 m²
Design & Construction
Hull Type Twin Keel
Rigging Type Masthead Sloop
Construction FG
Designer Laurent Giles
Builder Westerly Marine Ltd. (UK)
First Built 1972
Last Built 1976
Number Built 79
Associations Westerly Owners Association
Owner Reviews

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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
14.68
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
41.79
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
308.22
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
26.66
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
1.79
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. 6.19 kn
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
1.51
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. 641.73 pounds/inch
SA/Displacement (Calc) Calculated Sail Area to Displacement ratio using actual measured sail dimensions rather than reported values. More precise than the reported SA/Disp figure. 14.68
Rig Dimensions
I (Foretriangle Height) 32.50 ft / 9.91 m
J (Foretriangle Base) 10.10 ft / 3.08 m
P (Mainsail Luff) 28.00 ft / 8.53 m
E (Mainsail Foot) 11.50 ft / 3.51 m
SA Fore 164.13 ft² / 15.25 m²
SA Main 161.00 ft² / 14.96 m²
SA Total (100%) 325.13 ft² / 30.21 m²
Est. Forestay Length 34.03 ft / 10.37 m
Engine & Accommodations
Engine Make Petter
Engine Type Diesel
Horsepower 11
Fuel Capacity 9 gals / 34 L
Water Capacity 25 gals / 95 L
How It Compares

vs. Centaur 26 Westerly, Kingfisher 26, Pembroke 26 Westerly, S2 80 B, Yankee 26

This boat Similar boats
Dimensions
LOA
Chieftain 26 Westerly ★
26.0 ft
Centaur 26 Westerly
26.0 ft
Kingfisher 26
26.0 ft
Pembroke 26 Westerly
26.0 ft
S2 80 B
26.0 ft
Yankee 26
26.0 ft
LWL
Chieftain 26 Westerly ★
21.3 ft
Centaur 26 Westerly
21.3 ft
Kingfisher 26
21.0 ft
Pembroke 26 Westerly
21.3 ft
S2 80 B
21.4 ft
Yankee 26
20.7 ft
Beam
Chieftain 26 Westerly ★
8.4 ft
Centaur 26 Westerly
8.4 ft
Kingfisher 26
7.7 ft
Pembroke 26 Westerly
8.3 ft
S2 80 B
8.0 ft
Yankee 26
8.7 ft
Displacement
Chieftain 26 Westerly ★
6 lbs
Centaur 26 Westerly
6 lbs
Kingfisher 26
4 lbs
Pembroke 26 Westerly
6 lbs
S2 80 B
4 lbs
Yankee 26
5 lbs
Ballast
Chieftain 26 Westerly ★
2 lbs
Centaur 26 Westerly
2 lbs
Kingfisher 26
2 lbs
Pembroke 26 Westerly
2 lbs
S2 80 B
1 lbs
Yankee 26
2 lbs
Sail Area
Chieftain 26 Westerly ★
325 sq ft
Centaur 26 Westerly
324 sq ft
Kingfisher 26
270 sq ft
Pembroke 26 Westerly
210 sq ft
S2 80 B
282 sq ft
Yankee 26
Performance
SA / Displacement (higher = more powerful)
Chieftain 26 Westerly ★
14.7
Centaur 26 Westerly
14.6
Kingfisher 26
15.2
Pembroke 26 Westerly
9.6
S2 80 B
16.4
Yankee 26
Ballast / Disp (higher = stiffer)
Chieftain 26 Westerly ★
41.8 %
Centaur 26 Westerly
Kingfisher 26
Pembroke 26 Westerly
37.7 %
S2 80 B
Yankee 26
40.3 %
Comfort Ratio (higher = more comfortable offshore)
Chieftain 26 Westerly ★
26.7
Centaur 26 Westerly
26.7
Kingfisher 26
21.9
Pembroke 26 Westerly
26.6
S2 80 B
19.5
Yankee 26
Capsize Screening (lower = safer)
Chieftain 26 Westerly ★
1.79
Centaur 26 Westerly
1.79
Kingfisher 26
1.82
Pembroke 26 Westerly
1.78
S2 80 B
1.93
Yankee 26
Displacement / Length (lower = lighter)
Chieftain 26 Westerly ★
308
Centaur 26 Westerly
Kingfisher 26
Pembroke 26 Westerly
302
S2 80 B
Yankee 26
269
Hull Speed
Chieftain 26 Westerly ★
6.2 kts
Centaur 26 Westerly
6.2 kts
Kingfisher 26
6.1 kts
Pembroke 26 Westerly
6.2 kts
S2 80 B
6.2 kts
Yankee 26
Speed Number (higher = faster)
Chieftain 26 Westerly ★
1.5
Centaur 26 Westerly
1.5
Kingfisher 26
Pembroke 26 Westerly
S2 80 B
2.6
Yankee 26
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