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Gloucester 18
Designer: Rod Macalpine-Downie/Dick Gibbs  ·  Builder: Gloucester Yachts (Usa)  ·  First built: 1985
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About the Gloucester 18

Designed by the accomplished team of Rod Macalpine-Downie and Dick Gibbs, this compact centerboard dinghy represents thoughtful engineering for small boat sailing. First launched in 1985 by Gloucester Yachts, the design combines fiberglass and wood construction in an 18-foot package that prioritizes performance and handling over accommodation. With a fractional sloop rig carrying 175 square feet of sail area on a lightweight 500-pound displacement, this boat delivers spirited performance characteristics ideal for day sailing, sailing instruction, and small boat racing. The generous sail area to displacement ratio of 44.51 indicates excellent light-air performance and responsive handling that will satisfy experienced sailors while remaining manageable for newcomers to the sport. The 3.83-foot draft centerboard configuration allows access to shallow waters while providing adequate lateral resistance when sailing to windward. Her 6-foot beam strikes an effective balance between stability and trailering convenience, making her well-suited for sailors seeking an easily transported boat for exploring different sailing venues. The low comfort ratio of 4.16 and capsize screening value of 3.03 clearly identify this as a day sailor designed for protected waters rather than overnight cruising, emphasizing her role as a pure sailing machine focused on performance and boat handling skills development.

Core Dimensions
LOA (Length Overall) 18.00 ft / 5.49 m
LWL (Waterline Length) 16.67 ft / 5.08 m
Beam 6.00 ft / 1.83 m
Max Draft 3.83 ft / 1.17 m
Min Draft 0.58 ft / 0.18 m
Displacement 500.00 lb / 227 kg
Sail Area (Reported) 175.00 ft² / 16.26 m²
Design & Construction
Hull Type Centerboard Dinghy
Rigging Type Fractional Sloop
Construction FG Wood
Designer Rod Macalpine-Downie/Dick Gibbs
Builder Gloucester Yachts (USA)
First Built 1985
Associations Buccaneer 18 Class 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
44.51
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
48.19
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
4.16
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
3.03
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. 5.47 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. 357.38 pounds/inch
How It Compares

vs. Catalina 18, Hunter 18, Rhodes 18

This boat Similar boats
Dimensions
LOA
Gloucester 18 ★
18.0 ft
Catalina 18
18.0 ft
Hunter 18
18.0 ft
Rhodes 18
18.0 ft
LWL
Gloucester 18 ★
16.7 ft
Catalina 18
15.8 ft
Hunter 18
15.5 ft
Rhodes 18
17.0 ft
Beam
Gloucester 18 ★
6.0 ft
Catalina 18
7.8 ft
Hunter 18
7.5 ft
Rhodes 18
6.3 ft
Displacement
Gloucester 18 ★
500 lbs
Catalina 18
1 lbs
Hunter 18
1 lbs
Rhodes 18
1 lbs
Ballast
Gloucester 18 ★
Catalina 18
500 lbs
Hunter 18
500 lbs
Rhodes 18
Sail Area
Gloucester 18 ★
175 sq ft
Catalina 18
152 sq ft
Hunter 18
145 sq ft
Rhodes 18
162 sq ft
Performance
PHRF Rating (lower = faster)
Gloucester 18 ★
Catalina 18
289 s/nm
Hunter 18
282 s/nm
Rhodes 18
SA / Displacement (higher = more powerful)
Gloucester 18 ★
44.5
Catalina 18
19.9
Hunter 18
18.5
Rhodes 18
25.1
Ballast / Disp (higher = stiffer)
Gloucester 18 ★
Catalina 18
37.0 %
Hunter 18
35.7 %
Rhodes 18
Comfort Ratio (higher = more comfortable offshore)
Gloucester 18 ★
4.2
Catalina 18
8.2
Hunter 18
9.0
Rhodes 18
8.2
Capsize Screening (lower = safer)
Gloucester 18 ★
3.03
Catalina 18
2.81
Hunter 18
2.68
Rhodes 18
2.46
Displacement / Length (lower = lighter)
Gloucester 18 ★
48
Catalina 18
151
Hunter 18
167
Rhodes 18
Hull Speed
Gloucester 18 ★
5.5 kts
Catalina 18
5.3 kts
Hunter 18
5.3 kts
Rhodes 18
5.5 kts
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