The J40, a performance cruising boat, was designed by Rod Johnstone and built in the USA by Tillotson-Pearson.
Underwater Configuration: Fin Keel & Spade Rudder
Hull Material: GRP (Fiberglass)
Length Overall: 40'0" (12.2m)
Waterline Length: 34'0" (10.4m)
Beam: 12'2" (3.7m)
Draft: 6'6" (2.0m) - deep draft version, 5'6" (1.7m) - shallow draft fin keel version, 5'5" (1.6m) - wing keel version.
Rig Type: Masthead Sloop
Displacement: 18,000lb (8,165kg)
Designer: Rod Johnstone
Year First Built: 1984
Year Last Built: 1994
Number Built: 86
Although 'Blue Jay' is no longer available, the excellent pics and informative text are retained here for the benefit of anyone researching this popular performance cruiser.
1. Sail Area/Displacement Ratio: 17.9
2. Ballast/Displacement Ratio: 36.1
3. Displacement/Length Ratio: 204
4. Comfort Ratio: 27.9
5. Capsize Screening Formula: 1.9
1. A Sail Area/Displacement Ratio of 17.9 suggests that the J40 will, in the right conditions, approach her maximum hull speed readily and satisfy the sailing performance expectations of most cruising sailors.
2. A Ballast/Displacement Ratio of 36.1 means that the J40 will have a tendency to heel excessively in a gust, and she'll need to be reefed early to keep her sailing upright in a moderate breeze.
3. A Displacement/Length Ratio of 204, tells us the J40 is clearly a light displacement sailboat. If she's loaded with too much heavy cruising gear her performance will suffer dramatically.
4. Ted Brewer's Comfort Ratio of 27.9 suggests that crew comfort of a J40 in a seaway is similar to what you would associate with the motion of a coastal cruiser with moderate stability, which is not encouraging news for anyone prone to seasickness.
5. The Capsize Screening Formula (CSF) of 1.9 tells us that a J40 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.
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