Specifications of The J-Class
The Universal Rule was established in 1903 by Nathanael Herreshoff and the NYYC to normalise the sailing sport at every size of boat. The J-Class was first developed in 1929 from the Universal Rule and rates boats with the following criteria:
- rating:
- where:
- is the Load Waterline Length in feet
- is the quarter-beam length in feet
- is measured in square feet
- is measured in cubic feet
- 76 ft (23.16 m) 88 ft (26.82 m)
- where:
- maximum draught: 15 ft (4.57 m)
- minimum mast weight: unrestricted in 1930; 5,500 lb (2,500 kg) in 1934; 6,400 lb (2,900 kg) for the whole rig in 1937
- standards: Lloyds' A1 scantling rules
- build: aluminium hull forbidden in the 1930s, authorised today
- design: 1930s (replicas are only rated to the J-Class provided their design dates back to the 1930s)
- racing: elapsed time (1930s), Velocity Prediction Program ratings (today)
Launch | Name | Builder | LOA | LWL | Beam | Draught | Displacement | Sail area |
---|---|---|---|---|---|---|---|---|
1930 | Shamrock V | Camper and Nicholsons | 119 ft 1 in | 81 ft 1 in | 20 ft | 14 ft 9 in | 134 tons | 7,540 ft² |
1930 | Weetamoe | Herreshoff Manufacturing Company | 125 ft 9 in | 83 ft | 20 ft | 14 ft 6 in | 7,550 ft² | |
1930 | Yankee | George Lawley & Son | 126 ft | 83 ft | 22 ft 6 in | 14 ft 6 in | 148 tons | 7,288 ft² |
1930 | Whirlwind | George Lawley & Son | 139 ft | 86 ft | 21 ft 9 in | 15 ft 6 in | 158 tons | 7,335 ft² |
1930 | Enterprise | Herreshoff Manufacturing Company | 120 ft 9 in | 80 ft | 23 ft | 14 ft 6 in | 128 tons | 7,583 ft² |
1933 | Velsheda | Camper and Nicholsons | 127 ft 6 in | 83 ft | 21 ft 6 in | 15 ft | ||
1934 | Endeavour | Camper and Nicholsons | 129 ft 6 in | 83 ft 6 in | 22 ft | 14 ft 9 in | 143 tons | 7,651 ft² |
1934 | Rainbow | Herreshoff Manufacturing Company | 127 ft 6 in | 82 ft | 21 ft | 15 ft | 141 tons | 7,535 ft² |
1936 | Endeavour II | Camper and Nicholsons | 135 ft 6 in | 87 ft | 21 ft 6 in | 15 ft | 162 tons | 7,543 ft² |
1937 | Ranger | Bath Iron Works | 135 ft | 87 ft | 21 ft | 15 ft | 166 tons | 7,546 ft² |
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