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Dart 18
Designer: Rodney March  ·  Builder: Panthercraft Ltd. (Uk)  ·  First built: 1975
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About the Dart 18

Designed by Rodney March and first launched in 1975, the Dart 18 became one of the most successful small catamarans ever produced, with over 4,200 hulls built by Panthercraft Ltd. in the UK. This lightweight fiberglass catamaran established itself as an ideal entry point into high-performance sailing, offering exhilarating speed and responsive handling that made it a favorite among sailing schools and recreational sailors worldwide. At 18 feet overall with a 7.50-foot beam, the Dart 18 delivers impressive stability and carrying capacity for its size. The shallow 0.33-foot draft allows beach launching and sailing in skinny waters, while the 285-pound displacement keeps the boat light enough for easy handling ashore. Its fractional sloop rig with rotating mast maximizes efficiency from the 175 square feet of sail area, producing a remarkable sail area to displacement ratio of 64.72. The Dart 18 excels in coastal and bay sailing, particularly for those seeking an introduction to catamaran sailing without the complexity of daggerboards. Its forgiving nature and predictable handling characteristics make it suitable for sailing instruction, while still providing enough performance to satisfy experienced sailors. The boat's reputation for durability and straightforward maintenance has made it a enduring choice in the small catamaran market.

Core Dimensions
LOA (Length Overall) 18.00 ft / 5.49 m
LWL (Waterline Length) 17.00 ft / 5.18 m
Beam 7.50 ft / 2.29 m
Max Draft 0.33 ft / 0.10 m
Displacement 285.00 lb / 129 kg
Sail Area (Reported) 175.00 ft² / 16.26 m²
Design & Construction
Hull Type Catamaran (no boards/asym.)
Rigging Type Frac. Sloop (Rotating Spar)
Construction FG
Designer Rodney March
Builder Panthercraft Ltd. (UK)
First Built 1975
Number Built 4200
Associations Dart 18 Catamaran
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
64.72
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
1.73
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
4.56
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. 5.52 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. 2.73 pounds/inch
Engine & Accommodations
KSP 1.62
How It Compares

vs. Hobie 18 Magnum, Prindle 18, Prindle 18 2

This boat Similar boats
Dimensions
LOA
Dart 18 ★
18.0 ft
Hobie 18 Magnum
18.0 ft
Prindle 18
18.0 ft
Prindle 18 2
18.0 ft
LWL
Dart 18 ★
17.0 ft
Hobie 18 Magnum
Prindle 18
17.0 ft
Prindle 18 2
17.2 ft
Beam
Dart 18 ★
7.5 ft
Hobie 18 Magnum
8.0 ft
Prindle 18
7.9 ft
Prindle 18 2
8.5 ft
Displacement
Dart 18 ★
285 lbs
Hobie 18 Magnum
440 lbs
Prindle 18
335 lbs
Prindle 18 2
375 lbs
Sail Area
Dart 18 ★
175 sq ft
Hobie 18 Magnum
240 sq ft
Prindle 18
218 sq ft
Prindle 18 2
233 sq ft
Performance
SA / Displacement (higher = more powerful)
Dart 18 ★
64.7
Hobie 18 Magnum
66.5
Prindle 18
72.4
Prindle 18 2
Comfort Ratio (higher = more comfortable offshore)
Dart 18 ★
1.7
Hobie 18 Magnum
2.6
Prindle 18
Prindle 18 2
1.9
Capsize Screening (lower = safer)
Dart 18 ★
4.56
Hobie 18 Magnum
4.21
Prindle 18
Prindle 18 2
4.72
Hull Speed
Dart 18 ★
5.5 kts
Hobie 18 Magnum
5.2 kts
Prindle 18
Prindle 18 2
5.6 kts
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