The Southern Cross 31, a long-keeled cutter, was designed by Thomas Gilmer and built in the USA by Clark Ryder.
Underwater Profile: Long keel with transom-hung rudder
Hull Material: GRP
Length Overall: 31'0" / 9.5m
Waterline Length: 25'0" / 7.6m
Beam: 9'6" / 2.9m
Draft: 4'6" / 1.4m
Rig Type: Cutter
Displacement: 13,600lb / 6,169kg
Designer: Thomas Gilmer
Builder: Clark Ryder (USA)
Year First Built: 1975
Number Built: 150
Owners Association: Southern Cross Owners Association
1. Sail Area/Displacement Ratio: 12.6
2. Ballast/Displacement Ratio: 32.4
3. Displacement/Length Ratio: 389
4. Comfort Ratio: 37.6
5. Capsize Screening Formula: 1.6
read more about these all-revealing numbers...
1. A Sail Area/Displacement Ratio of just 12.6 suggests that the Southern Cross 31 will need a stiff breeze to get her going. In light conditions, unless you've got plenty of time on your hands, motor-sailing may be the way to go.
2. A Ballast/Displacement Ratio of 32.4 means that unless the bulk of the ballast is concentrated in a bulb at the foot of her keel, the Southern Cross 31 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 389, tells us the Southern Cross 31 is firmly in the ultra-heavy displacement category. Load her up as much as you like and her performance will be hardly affected, not that it was ever startling. Few if any sailboats are built to this displacement category these days - but they remain popular with some long-distance sailors.
4. Ted Brewer's Comfort Ratio of 37.6 suggests that crew comfort of a Southern Cross 31 in a seaway is similar to what you would associate with the motion of a moderate bluewater cruising boat - a predictable and acceptable motion for most seasoned sailors.
5. The Capsize Screening Formula (CSF) of 1.6 tells us that a Southern Cross 31 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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