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Johnson 18
Designer: Rodger Martin  ·  Builder: Johnson Boat Works/Catalina Yachts  ·  First built: 1994
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About the Johnson 18

Designed by Rodger Martin and built by Johnson Boat Works in partnership with Catalina Yachts, this compact centerboard dinghy represents a thoughtful approach to small boat sailing. With production beginning in 1994 and approximately 100 hulls completed, the Johnson 18 carved out a niche among sailors seeking a trailerable boat capable of both daysailing and light coastal cruising. The fractional sloop rig delivers responsive handling characteristics, while the centerboard configuration provides shoal water versatility that opens up shallow anchorages and launching options unavailable to fixed-keel boats. At 480 pounds displacement with 185 square feet of sail area, this fiberglass design offers an impressive power-to-weight ratio that translates to spirited performance in moderate conditions. The boat's 6.58-foot beam provides reasonable stability for its size class, though the relatively high capsize screening value of 3.36 suggests this design favors protected waters over exposed coastal sailing. The Martin design emphasizes simplicity and ease of handling, making it well-suited for single-handed sailing or as a capable trainer for developing sailing skills. Weekend coastal exploring and club racing represent ideal applications for this versatile small boat platform.

Core Dimensions
LOA (Length Overall) 18.00 ft / 5.49 m
Beam 6.58 ft / 2.01 m
Max Draft 4.50 ft / 1.37 m
Min Draft 0.42 ft / 0.13 m
Displacement 480.00 lb / 218 kg
Sail Area (Reported) 185.00 ft² / 17.19 m²
Design & Construction
Hull Type Centerboard Dinghy
Rigging Type Fractional Sloop
Construction FG
Designer Rodger Martin
Builder Johnson Boat Works/Catalina Yachts
First Built 1994
Number Built 100
Associations Johnson 18
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Performance Ratios
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
59.83
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
3.72
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. 5.24 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. 2.16 pounds/inch
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