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The International DN is a class of iceboat.The name stands for Detroit News, where the first iceboat of this type was designed and built in the winter of 1936–1937.. Archie Arrol was a master craftsman working in the Detroit News hobby shop, and together with iceboaters Joe Lodge and Norman Jarrait designed a racing boat they called the "Blue Streak 60", later to become known as the
The DN 60 derives its name from the 1937 request of The Detroit News for a high-performance, inexpensive, home-built iceboat design. Modern DNs share many one-design features with the original boat, including the basic aerodynamic fuselage design, runner configurations and 60 square feet (5.6 m 2) of high-performance sail. [16]
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DN class ice boat Class 3 competition land yacht Sailing employs the wind—acting on sails , wingsails or kites —to propel a craft on the surface of the water ( sailing ship , sailboat , raft , windsurfer , or kitesurfer ), on ice ( iceboat ) or on land ( land yacht ) over a chosen course , which is often part of a larger plan of navigation .
The company's model names all start with "J/" and then the design's length overall (LOA), in feet (such as the J/24), or beginning in 1994 in decimeters , or starting 2021 in meters . All J/Boat designs are monohull , sloop -rigged keelboats constructed of cored sandwich fiberglass . [ 3 ]
J/24 Europameisterschaft race, 2007. The J/24 is a racing keelboat, built predominantly of fiberglass, with wood trim. It has a fractional sloop rig, a raked stem, a plumb transom, a transom-hung rudder controlled by a tiller and a fixed fin keel. It displaces 3,100 lb (1,406 kg) and carries 950 lb (431 kg) of lead ballast. [3] [4]
Limitations to iceboat speed are windage, friction, the camber of the sail shape, strength of construction, and quality of the ice surface. Iceboats can sail as close as 7 degrees off the apparent wind. [4] Ice boats can achieve speeds as high as ten times the wind speed in good conditions.