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Jollyboat
Designer: Uffa Fox  ·  Builder: Fairey Marine (Uk) Columbia Yachts  ·  First built: 1950
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About the Jollyboat

With limited specifications available in current databases, the Jollyboat represents one of the more elusive entries in sailing vessel documentation. This scarcity of detailed information often indicates either a custom or limited-production design, or potentially a boat from an era when comprehensive specifications weren't systematically recorded. Based on the traditional maritime terminology, jollyboats historically served as versatile small craft, typically functioning as ship's boats or coastal workhorses. Modern sailboats bearing this name likely draw inspiration from this heritage of practicality and seaworthiness. Such vessels often emphasize functionality over pure performance, making them potentially well-suited for coastal cruising, day sailing, or as tender craft for larger vessels. Without detailed specifications, prospective buyers should focus their research on direct inspection and sea trials to evaluate build quality, sailing characteristics, and overall condition. The limited available data suggests this may be a niche design that appeals to sailors seeking something distinctive from mainstream production boats. Given the maritime heritage associated with the jollyboat designation, these vessels may offer traditional sailing qualities that emphasize reliability and practical seamanship over cutting-edge performance metrics.

Core Dimensions
LOA (Length Overall) 18.00 ft / 5.49 m
LWL (Waterline Length) 17.50 ft / 5.33 m
Beam 5.00 ft / 1.52 m
Max Draft 4.75 ft / 1.45 m
Min Draft 0.67 ft / 0.20 m
Displacement 300.00 lb / 136 kg
Sail Area (Reported) 160.00 ft² / 14.86 m²
Design & Construction
Hull Type Centerboard Dinghy
Rigging Type Fractional Sloop
Construction Wood or FG
Designer Uffa Fox
Builder Fairey Marine (UK) Columbia Yachts
First Built 1950
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
57.18
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
3.07
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
2.99
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. 5.61
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. 312.65
How It Compares

vs. Cape Cod Knockabout, Duxbury Duck, Interlake, Mercury 18, Rhodes 18

This boat Similar boats
Dimensions
LOA
Jollyboat ★
18.0 ft
Cape Cod Knockabout
18.0 ft
Duxbury Duck
18.0 ft
Interlake
18.0 ft
Mercury 18
18.0 ft
Rhodes 18
18.0 ft
LWL
Jollyboat ★
17.5 ft
Cape Cod Knockabout
15.5 ft
Duxbury Duck
15.1 ft
Interlake
Mercury 18
13.0 ft
Rhodes 18
17.0 ft
Beam
Jollyboat ★
5.0 ft
Cape Cod Knockabout
6.0 ft
Duxbury Duck
6.3 ft
Interlake
6.3 ft
Mercury 18
5.3 ft
Rhodes 18
6.3 ft
Displacement
Jollyboat ★
300 lbs
Cape Cod Knockabout
650 lbs
Duxbury Duck
700 lbs
Interlake
650 lbs
Mercury 18
1 lbs
Rhodes 18
1 lbs
Sail Area
Jollyboat ★
160 sq ft
Cape Cod Knockabout
165 sq ft
Duxbury Duck
342 sq ft
Interlake
175 sq ft
Mercury 18
Rhodes 18
162 sq ft
Performance
SA / Displacement (higher = more powerful)
Jollyboat ★
57.2
Cape Cod Knockabout
35.2
Duxbury Duck
69.5
Interlake
Mercury 18
Rhodes 18
25.1
Comfort Ratio (higher = more comfortable offshore)
Jollyboat ★
3.1
Cape Cod Knockabout
5.7
Duxbury Duck
5.8
Interlake
5.4
Mercury 18
Rhodes 18
8.2
Capsize Screening (lower = safer)
Jollyboat ★
2.99
Cape Cod Knockabout
2.77
Duxbury Duck
2.85
Interlake
Mercury 18
Rhodes 18
2.46
Displacement / Length (lower = lighter)
Jollyboat ★
Cape Cod Knockabout
Duxbury Duck
91
Interlake
81
Mercury 18
223
Rhodes 18
Hull Speed
Jollyboat ★
5.6 kts
Cape Cod Knockabout
5.3 kts
Duxbury Duck
5.2 kts
Interlake
5.2 kts
Mercury 18
Rhodes 18
5.5 kts
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