The J46 Sailboat
Specs & Key Performance Indicators
The J46, a high-performance cruising yacht, was designed by Rod Johnstone and built in the USA by J Boats.
A J46 light-displacement, performance cruising yacht.
Published Specification for the J46
Underwater Configuration: Bulb fin keel & spade rudder
Hull Material: GRP (Fibreglass)
Length Overall: 46'0" (14.0m)
Waterline Length: 40'6" (12.3m)
Beam: 13'10" (4.2m)
Draft: 6'3" (1.9m)
Rig Type: Masthead sloop
Displacement: 24,000lb (10,886kg)
Designer: Rod Johnstone
Builder: J Boats (USA)
Year First Built: 1995
Year Last Built: 2003
Number Built: 35
Owners Association: J Boat Owners
Published Design Ratios for the J46
1. Sail Area/Displacement Ratio: 19.7
- Less than 16 would be considered under-powered;
- 16 to 20 would indicate reasonably good performance;
- Over 20 suggests relatively high performance.
2. Ballast/Displacement Ratio: 39.2
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 161
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 26.7
- Under 20 indicates a lightweight racing boat
- 20 to 30 indicates a coastal cruiser
- 30 to 40 indicates a moderate offshore cruising boat
- 40 to 50 indicates a heavy offshore boat
- Over 50 indicates an extremely heavy offshore boat
5. Capsize Screening Formula: 1.9
- Under 2.0 (the lower the better): Better suited for ocean passages
- Over 2.0: Less suited for ocean passages
read more about these Key Performance Indicators...
Summary Analysis of the Design Ratios for the J46
1. A Sail Area/Displacement Ratio of 19.7 suggests that, in the right hands, the J/46 will have enough performance to leave most other sailboats of similar waterline length well astern.
2. A Ballast/Displacement Ratio of 40.0 means that the J/46 will initially stand up reasonably well to her canvas in a moderate breeze, but she'll need a reef in the main to avoid heeling excessively in a gust.
3. A Displacement/Length Ratio of 161, tells us the J/46 is clearly a light displacement sailboat. If she's loaded with too much heavy cruising gear her performance will suffer to a degree.
5. The Capsize Screening Formula (CSF) of 1.9 tells us that a J/46 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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