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Gloucester 18 Whitecap
Designer: Harry Sindle  ·  Builder: Lockley-Newport Boats Inc. (Usa)  ·  First built: 1974
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About the Gloucester 18 Whitecap

With limited documentation available, the Gloucester 18 Whitecap represents an intriguing piece of sailing history that deserves recognition among small boat enthusiasts. This 18-foot sailboat appears to have been designed with the practical sailing traditions of Gloucester, Massachusetts in mind, where generations of mariners have valued seaworthiness and reliability above flashy performance. Based on its name and heritage, the Whitecap likely embodies the robust construction principles associated with boats from this legendary fishing port. Gloucester-designed vessels have historically been built to handle the challenging conditions of New England waters, suggesting this boat would be well-suited for coastal sailing and day cruising in moderate conditions. The relatively modest size makes it an appealing option for sailors seeking an uncomplicated sailing experience without the complexity of larger vessels. While comprehensive specifications remain elusive, the Gloucester connection implies thoughtful design focused on safety and ease of handling rather than cutting-edge performance. For prospective buyers interested in classic American small boat design, the Whitecap offers the appeal of owning a piece of New England's rich maritime tradition, though researching individual examples carefully would be essential given the limited available documentation.

Core Dimensions
LOA (Length Overall) 18.00 ft / 5.49 m
LWL (Waterline Length) 16.50 ft / 5.03 m
Beam 6.58 ft / 2.01 m
Max Draft 5.00 ft / 1.52 m
Displacement 750.00 lb / 340 kg
Ballast 125.00 lb / 57 kg
Design & Construction
Hull Type Centerboard Dinghy
Rigging Type Fractional Sloop
Construction FG
Designer Harry Sindle
Builder Lockley-Newport Boats Inc. (USA)
First Built 1974
Last Built 1984
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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
16.67
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
74.54
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. 2.33 pounds/inch
Rig Dimensions
I (Foretriangle Height) 0.67 ft / 0.20 m
P (Mainsail Luff) 176.00 ft² / 16.35 m²
E (Mainsail Foot) 74.54
How It Compares

vs. Buccaneer 18, Capri 18 Catalina, Catalina 18

This boat Similar boats
Dimensions
LOA
Gloucester 18 Whitecap ★
18.0 ft
Buccaneer 18
18.0 ft
Capri 18 Catalina
18.0 ft
Catalina 18
18.0 ft
LWL
Gloucester 18 Whitecap ★
16.5 ft
Buccaneer 18
16.7 ft
Capri 18 Catalina
16.3 ft
Catalina 18
15.8 ft
Beam
Gloucester 18 Whitecap ★
6.6 ft
Buccaneer 18
6.0 ft
Capri 18 Catalina
7.6 ft
Catalina 18
7.8 ft
Displacement
Gloucester 18 Whitecap ★
750 lbs
Buccaneer 18
500 lbs
Capri 18 Catalina
1 lbs
Catalina 18
1 lbs
Ballast
Gloucester 18 Whitecap ★
125 lbs
Buccaneer 18
Capri 18 Catalina
425 lbs
Catalina 18
500 lbs
Sail Area
Gloucester 18 Whitecap ★
Buccaneer 18
175 sq ft
Capri 18 Catalina
155 sq ft
Catalina 18
152 sq ft
Performance
SA / Displacement (higher = more powerful)
Gloucester 18 Whitecap ★
Buccaneer 18
44.5
Capri 18 Catalina
19.0
Catalina 18
19.9
Ballast / Disp (higher = stiffer)
Gloucester 18 Whitecap ★
16.7 %
Buccaneer 18
Capri 18 Catalina
28.3 %
Catalina 18
37.0 %
Comfort Ratio (higher = more comfortable offshore)
Gloucester 18 Whitecap ★
Buccaneer 18
4.2
Capri 18 Catalina
9.3
Catalina 18
8.2
Capsize Screening (lower = safer)
Gloucester 18 Whitecap ★
Buccaneer 18
3.03
Capri 18 Catalina
2.65
Catalina 18
2.81
Displacement / Length (lower = lighter)
Gloucester 18 Whitecap ★
74
Buccaneer 18
Capri 18 Catalina
153
Catalina 18
151
Hull Speed
Gloucester 18 Whitecap ★
Buccaneer 18
5.5 kts
Capri 18 Catalina
5.4 kts
Catalina 18
5.3 kts
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