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Sailboat Specifications

Ideal 18

Fractional Sloop · Fin W/Spade Rudder

Designed by Bruce Kirby · Built by Ontario Yachts (Can) · First built 1989

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LOA 17.85 ft  ·  Beam 6.20 ft  ·  Displacement 1,240.00 lb  ·  Sail Area 168.00 ft²  ·  Fractional Sloop  ·  Fin W/Spade Rudder
About the Ideal 18 Sailboat

Designed by renowned naval architect Bruce Kirby, this compact 18-footer represents a thoughtful approach to small boat sailing that emphasizes performance and seaworthiness. Built by Ontario Yachts from 1989 through a production run of 325 boats, the Ideal 18 showcases Kirby's expertise in creating vessels that punch above their weight class. The boat's fractional sloop rig and fin keel with spade rudder configuration deliver responsive handling characteristics that make it well-suited for both recreational day sailing and competitive racing in protected waters. With a substantial ballast-to-displacement ratio, the design offers impressive stability for coastal cruising adventures, while the moderate sail area provides manageable power for sailors of varying experience levels. The fiberglass construction ensures durability and relatively low maintenance, making it an attractive option for sailors seeking a trailerable boat that doesn't compromise on sailing qualities. The Ideal 18's balanced proportions and Kirby's reputation for creating intuitive designs suggest a forgiving nature that builds confidence in developing sailors while still providing enough performance to keep experienced helmsmen engaged. This combination of accessibility and capability has helped establish the boat as a respected choice in the small keelboat category.

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Dimensions & Specifications
LOA (Length Overall) 17.85 ft / 5.44 m
LWL (Waterline Length) 14.35 ft / 4.37 m
Beam 6.20 ft / 1.89 m
Max Draft 3.25 ft / 0.99 m
Displacement 1,240.00 lb / 562 kg
Ballast 700.00 lb / 318 kg
Ballast Type Lead
Sail Area (Reported) 168.00 ft² / 15.61 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Fractional Sloop
Construction FG
Designer Bruce Kirby
Builder Ontario Yachts (CAN)
First Built 1989
Number Built 325
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Frequently Asked Questions

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

The Ideal 18 has a Sail Area to Displacement ratio (SA/D) of 23.33. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Ideal 18's comfort ratio?

The Ideal 18 has a Ted Brewer Comfort Ratio of 10.94. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Ideal 18 safe for offshore sailing?

The Ideal 18 has a Capsize Screening Formula value of 2.31. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Ideal 18?

The theoretical hull speed of the Ideal 18 is 5.08 kn knots, calculated from its waterline length.

How much does a Ideal 18 weigh?

The Ideal 18 has a displacement of 1,240.00 lb and a length overall (LOA) of 17.85 ft.

Who designed the Ideal 18?

The Ideal 18 was designed by Bruce Kirby, first built in 1989.