J-class Yacht - Specifications of The J-Class

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)
  • 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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