Built by Various (amateur or kit built) • Designed by Christian Maury
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420 - Photo
420 - Drawing

General Information

Hull Type: Centerboard Dinghy
Rigging Type: Fractional Sloop
Construction: FG
First Built: 1959
Number Built: 56000

Dimensions

Length Overall (LOA): 4.20 m
Length Waterline (LWL): 4.01 m
Beam: 1.65 m
Draft (Max): 0.97 m
Draft (Min): 0.15 m

Weight & Ballast

Displacement: 100 kg

Sail Plan

Sail Area (reported): 13.01 m²

Performance Ratios

On the numbers, 420 rates as ultralight (D/L 43). Its comfort ratio of 2.7 is in the "lightweight racing" band; its capsize screening value of 3.59 is in the "above the guideline" band.

Ratios use published displacement (often light ship) and reported sail area; see Sources & methodology.

Hull Speed: 4.86 knots
SA/Displacement (Reported): 61.52
Displacement/Length: 42.99

D/L 43 — ultralight. Lower than 68% of the 232 monohulls between 3.6 m and 4.8 m in our catalogue. Displacement relative to waterline length: low numbers mean a light boat that accelerates and planes easily, high numbers a heavy boat that carries its weight through a seaway.

Comfort Ratio: 2.68

Comfort ratio 2.7 — lightweight racing. Lower than 71% of the 232 monohulls between 3.6 m and 4.8 m in our catalogue. An estimate of motion comfort in waves from displacement, beam and length: higher values suggest a slower, gentler motion.

Capsize Screening: 3.59

Capsize screening 3.59 — above the guideline. Higher than 66% of the 434 monohulls between 3.6 m and 4.8 m in our catalogue. A screening formula from beam and displacement: lower is better, and values under 2.0 are the common guideline for offshore boats.

Immersion: 46 kg/cm

Notes

One of the most successful sailing dinghies ever. (Only the SUNFISH or LASER can be considered in the same league.)

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