Land sailing, also known as sand yachting or land yachting, is the act of moving acrossland in a wheeled vehicle powered by wind through the use of a sail. The term comes from analogy with (water) sailing. Historically, land sailing was used as a mode of transportation orrecreation. Since the 1950s it has evolved primarily into a racing sport.
Vehicles used in sailing are known as sail wagons, sand yachts, or land yachts. They are typically three-wheeled vehicles that function much like a sailboat, except that they are operated from a sitting or lying position and steered by pedals or hand levers. Land sailing works best in windy, flat areas, and races often take place on beaches, air fields, and dry lake beds in desert regions. Modern land sailors, generally known as “pilots”, can go three to four times faster than the wind speed, because of Bernoulli’s principle. A gust of wind is considered more beneficial in a land sailing race than a favorable windshift. A similar sport, known as ice yachting, is practiced on frozen lakes and rivers. Another variation is the Whike, which combines land sailing with bicycling and can therefore also be used in everyday traffic because it does not fully depend on wind.
Reference: Wikipedia Land Sailing