The International DN is the largest class of ice boats worldwide. The name stands for Detroit News, after a contest sponsored by that chain in 1937.
The DN is 12 feet (3.7 m) long, with a 21 inch (53 cm) wide cockpit and an 8-foot (2.4 m) wide runner plank. The 16 foot (4.9 m) mast supports 60 square feet (5.6 m�) of sail area. The front runner is typically rigged with a steering rod that connects the runner to a tiller that is mounted just aft of the mast base. The boat weighs around 100 lb (45 kg), and is piloted by a single helmeted sailor.
The DN is raced extensively in the northern United States, Canada, and throughout Northern Europe, with World Championships alternating between North American and Europe each year. In addition to the World Championship, the North American and European Championships count towards a racer's World Ranking.
One of the reasons that the DN Ice Boat Class has become so popular over the years has been largely in part to how transportable and fast they truly are. With a steady 10-12 mile per hour wind and good ice conditions, the DN, when piloted properly, can reach speeds in excess of 50 miles per hour. And with just a 12-15 mile per hour steady wind, the DN ice boat can reach a readily attainable 55 65 miles per hour, providing a thrilling rush of purely unadulterated bone chilling wind powered ice sailing.