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J/42

Built by J Boats Tillotson Pearson • Designed by Johnstone

General Information

Hull Type: Fin w/bulb & spade rudder

Rigging Type: Masthead Sloop

Construction: FG

First Built: 1999

Last Built: 2005

Number Built: 35

Dimensions

Length Overall (LOA): 12.80 m

Length Waterline (LWL): 10.70 m

Beam: 3.72 m

Draft (Max): 2.01 m

Weight & Ballast

Displacement: 8,936 kg

Ballast: 3,175 kg

Ballast Type: Lead

Sail Plan

Foresail Area: 34.48 m²

Mainsail Area: 38.88 m²

Sail Area: 73.36 m²

Sail Area (reported): 73.39 m²

I (Fore Triangle Height): 15.39 m

J (Fore Triangle Base): 4.48 m

P (Mainsail Hoist): 14.17 m

E (Boom Length): 5.49 m

Est. Forestay Length: 16.03 m

Engine & Systems

Engine Make: Yanmar

Engine Type: Diesel

Engine Model: 3JH2-TE

Engine Power: 67 HP

Fuel Capacity: 117 L

Water Capacity: 379 L

Performance Ratios

On the numbers, J/42 rates as moderate (SA/D 17.4) and moderate (D/L 203). Its comfort ratio of 29.3 is in the "coastal cruiser" band; its ballast/displacement ratio of 35.5% is in the "moderate" band.

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

Hull Speed: 7.94 knots

SA/Displacement (Calc): 17.39

SA/D 17.4 — moderate. Higher than 57% of the 983 monohulls between 11.5 m and 14.1 m in our catalogue. Sail area relative to displacement: the higher the number, the more sail the boat carries for its weight, which means more power in light air.

SA/Displacement (Reported): 17.40

Ballast/Disp Ratio: 35.53%

Ballast/Disp 35.5% — moderate. Lower than 66% of the 1401 monohulls between 11.5 m and 14.1 m in our catalogue. The share of the boat's weight that is ballast: a higher share generally means a stiffer boat that stands up better to its sail area.

Displacement/Length: 203.37

D/L 203 — moderate. Lower than 65% of the 1540 monohulls between 11.5 m and 14.1 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: 29.28

Comfort ratio 29.3 — coastal cruiser. Right in the middle of the 1539 monohulls between 11.5 m and 14.1 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: 1.81

Capsize screening 1.81 — meets the common offshore guideline. Lower than 60% of the 1561 monohulls between 11.5 m and 14.1 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.

S-Number: 2.71

S-number 2.7. Higher than 60% of the 971 monohulls between 11.5 m and 14.1 m in our catalogue. A stability number combining hull form and ballast: higher values indicate better stability and sea-keeping.

Immersion: 273 kg/cm