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Sailboat Specifications

Naiad 18

Cat (Unstayed) · Centerboard (Trunk)

Designed by Mark Ellis · Built by Luna Yachts · First built 1984

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LOA 18.25 ft  ·  Beam 6.00 ft  ·  Displacement 1,100.00 lb  ·  Sail Area 144.00 ft²  ·  Cat (Unstayed)  ·  Centerboard (Trunk)
About the Naiad 18 Sailboat

Designed by Mark Ellis and built by Luna Yachts beginning in 1984, this compact 18-footer represents an intriguing approach to small boat sailing with its unstayed catboat rig and centerboard configuration. The Naiad 18's relatively deep draft of 3.67 feet with board down suggests serious sailing performance despite its modest size, while the substantial ballast-to-displacement ratio of exactly 50% provides impressive stability for coastal adventures. The boat's cat rig eliminates the complexity of stays and multiple sails, making it an excellent choice for single-handed sailing or teaching newcomers the fundamentals. This simple yet effective sail plan, combined with 144 square feet of working sail area, delivers respectable performance while remaining manageable in varying conditions. The fiberglass construction ensures durability and lower maintenance compared to traditional wooden small craft. With a comfort ratio of 8.81, the Naiad 18 falls into the racing boat category, indicating a relatively stiff, responsive hull that prioritizes performance over pure comfort. The capsize screening formula of 2.33 suggests good stability characteristics for coastal sailing, though like most boats this size, it's best suited for protected waters, day sailing, and near-shore cruising rather than extended offshore passages.

Dimensions & Specifications
LOA (Length Overall) 18.25 ft / 5.56 m
LWL (Waterline Length) 17.50 ft / 5.33 m
Beam 6.00 ft / 1.83 m
Max Draft 3.67 ft / 1.12 m
Min Draft 0.67 ft / 0.20 m
Displacement 1,100.00 lb / 499 kg
Ballast 550.00 lb / 249 kg
Sail Area (Reported) 144.00 ft² / 13.38 m²
Design & Construction
Hull Type Centerboard (Trunk)
Rigging Type Cat (unstayed)
Construction FG
Designer Mark Ellis
Builder Luna Yachts
First Built 1984
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Frequently Asked Questions

What is the Naiad 18's sail area to displacement ratio?

The Naiad 18 has a Sail Area to Displacement ratio (SA/D) of 21.66. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Naiad 18's comfort ratio?

The Naiad 18 has a Ted Brewer Comfort Ratio of 8.81. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Naiad 18 safe for offshore sailing?

The Naiad 18 has a Capsize Screening Formula value of 2.33. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Naiad 18?

The theoretical hull speed of the Naiad 18 is 5.61 kn knots, calculated from its waterline length.

How much does a Naiad 18 weigh?

The Naiad 18 has a displacement of 1,100.00 lb and a length overall (LOA) of 18.25 ft.

Who designed the Naiad 18?

The Naiad 18 was designed by Mark Ellis, first built in 1984.