Class Specifications
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JMeasurement.pdf Measurment formula for the various yachts (August 2002). J Class Rules - Updated January 2002 1.0 HULL 1.1 Must be a scale model of one of the original “J” boats. 1.2 Scale must be 3/4 inch equals one foot. 1.3 Exception: The keel draft can be two inches deeper than scale to help the stiffness of the model. 2.0 MAST 2.1 Height: Mast height may be to scale of the yachts original sail plan. Not to exceed 10 feet. (1988) 2.2 Material: The mast is to be constructed of Wood or Aluminum. 3.0 SAILS 3.1 No restriction on sail area other than sail area may not exceed the scale sail plan area. 3.2 Any sail plan that was used by the original boat from which the model was scaled, i.e. double head sails, Genoa, Spinnakers, etc. may be used on the model. 3.3 Maximum sail area for each model is as follows; Whirlwind - Whirlwind and Vanguard hull - 2478 square inches Whirlwind 1/16 scale - 4128 square inches Weetamoe - 4247 square inches Yankee - 4100 square inches Enterprise - 4265 square inches Shamrock V - 4241 square inches Rainbow - 4238 square inches Endeavour - 4253 square inches Ranger - 4245 square inches Endeavour II - 4243 square inches 4.0 RUDDER 4.1 Must conform to the original boat from which it was scaled. 4.2 Exception: The rudder may be two inches deeper to follow the extended keel and two inches wider to provide extra maneuvering control. 5.0 DECK 5.1 The deck shall be made from a hard material such as wood, fiberglass, Formica or some similar material. Fabric and film decks are not allowed. 6.0 DISPLACEMENT 6.1 Each model yacht shall have a minimum ready to sail weight, that is the weight of the model when it is ready to race. 6.2 The weight of the model shall not be changed once a regatta has begun. A regatta is defined as a race or series of races that constitute an event regardless of the number of days the event covers. 6.3 The minimum displacement for each model is as follows; Whirlwind - Whirlwind and Vanguard hulls - 63 pounds Whirlwind 1/16 scale - 77 pounds Weetamoe - 69 pounds Yankee - 72 pounds Enterprise - 62 pounds Shamrock V - 65 pounds Rainbow - 68 pounds Endeavour - 69 pounds Ranger - 81 pounds Endeavour II - 79 pounds Revised January 2002 |
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