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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.
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.
From left: IEC Type 1/SAE J1772 inlet; Tesla NACS outlet; IEC Type 2 connector outlet IEC 62196 Plugs, socket-outlets, vehicle connectors and vehicle inlets – Conductive charging of electric vehicles is a series of international standards that define requirements and tests for plugs, socket-outlets, vehicle connectors and vehicle inlets for conductive charging of electric vehicles and is ...
In addition to pulling ropes attached to the iceboat, hand-holds were molded along the outer gunwales which were used for hauling the iceboat over sea ice until reaching stretches of open water. Crews and passengers faced stretches of open water, the sea ice, and slush ice that was in the process of freezing, which could make progress difficult.
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City Ice Boat No. 3, commonly known as Ice Boat No. 3 or just No. 3, was a municipal sidewheel icebreaker built in 1873 to assist in keeping Philadelphia's waterways free of ice during the winter months. The vessel was also used for occasional excursions and other duties through the rest of the year.