Snowmobile
From Freepedia
Image:Snowmobiles.jpg A snowmobile (or snow scooter, often referred to by enthusiasts as a 'sled' and in the Canadian north as a 'snow machine') is a land vehicle propelled by one or two rubber tracks, with skis for steering. They are designed to be operated on snow and ice, and require no road or trail. Most snowmobiles are typically powered by two-stroke gasoline/petrol internal combustion engines. Even though they are not designed for it, snowmobiles will skim on top of water if the speed is high enough, as demonstrated by the annual snowmobile river drag race in Kautokeino, Norway. Summertime occupations for snowmobile enthustists can involve drag racing on grass or even asphalt strips.
The earliest snowmobiles were modified Ford Model Ts with the undercarriage replaced with tracks and skis. They were popular for rural mail delivery for a time. Polaris Industries in Roseau, Minnesota, in the United States Midwest, was a pioneer in the production of purpose-built snowmobiles.
The relatively dry snow conditions of the United States Midwest made the converted model Ts and other like vehicles not suitable for operation in more humid snow areas such as Southern Quebec. This led Joseph-Armand Bombardier of the small town of Valcourt in Quebec, Canada, to invent a different caterpillar track system suitable for all kinds of snow conditions. (The Kegresse track, a similar rubber track, was used on off-road halftrack military trucks before and during World War Two. It was developed by France and used in a variety of combat vehicles by the U.S. [1]) He started production of a large, enclosed, seven-passenger snowmobile in 1937, and introduced another enclosed twelve-passenger model in 1942.
It was only in 1959 that he invented what we know as the modern snowmobile in its open-cockpit one- or two-person form, and started selling it as the "Ski-doo". Competitors sprang up and copied and improved his design. In the 1970s there were hundreds of snowmobile manufacturers. From 1970 to 1973 they sold close to two million machines, a sales summit never since equalled. Many of the snowmobile companies were small outfits and the biggest manufacturers were often attempts by motorcycle makers and outboard motor makers to branch off in a new market. Most of these companies went bankrupt during the gasoline crisis of 1973 and succeeding recessions, or were bought up by the larger ones. Sales reached a peak of 260,000 in 1997 and went down gradually, influenced by warmer winters and the use during all four seasons of small one- or two-person ATVs. Bombardier Recreational Products, a former division of the first company, still makes snowmobiles, outboard motors, personal watercraft, and ATVs. The snowmobile market is now divided up between four big makers: Bombardier, Arctic Cat, Yamaha, and Polaris.
Image:Snowmobile.jpg Snowmobiles are widely used in arctic territories for travel. However, the small population of the Arctic areas makes for a correspondingly small market. Most of the annual snowmobile production is sold for recreative purposes much further south, in those parts of North America where the snow cover is stable during the winter months. The number of snowmobiles in Europe and other parts of the world is relatively low.
Modern snowmobiles can achieve speeds in excess of 193 km/h (120mph). (Racing snowmobiles reach speeds in excess of 241 km/h [150mph]). They provide millions with a safe and fun way to escape the pressures of everyday life, and enjoy the snow covered scenery.
Environmental impact:
The environmental impact of snowmobiles has been the subject of much debate. Most snowmobiles are still powered by two-stroke engines, although almost all of Yamaha's lineup is now powered by four-strokes. In the last decade several manufacturers have been experimenting with less polluting motors, and putting most of them in production. Yamaha and Arctic-Cat were the first to mass produce four-stroke models, which are significantly less polluting than the early two-stroke machines. Bombardier and Polaris followed by offering new four stoke and semi direct injection, SDI, two stroke motors. Bombardier’s new SDI two stroke emits 50 percent less pollutants. The industry is also working on direct injected "clean two strokes" which are actually an improvement on four strokes in terms of hydrocarbon and greenhouse gas emissions. Bombardier is working on bringing new technology called "direct-injection", from their sister company Evinrude, into snowmobiling. "Direct-injection" is a step above SDI, and is claimed to run as clean as a 4-stroke. Snowmobile manufacturers are now being forced to meet strict EPA emissions standards. Third-party vendors are starting to introduce electric-hybrid snowmobiles to furthur reduce pollution.
On November 4, 2004, the National Park Service of the United States approved a Finding of No Significant Impact (FONSI) for the Temporary Winter Use Plans and Environmental Assessment for Winter Use in Yellowstone and Grand Teton National Parks and the John D. Rockefeller, Jr., Memorial Parkway. The Final Rule implementing this decision was published in the Federal Register on November 10, 2004. This decision allows 720 snowmobiles per day in Yellowstone, all commercially guided. In Grand Teton National Park and the John D. Rockefeller, Jr., Memorial Parkway, 140 snowmobiles would be allowed. With minor exceptions, all snowmobiles would be required to meet NPS Best Available Technology (BAT) requirements. The plan will be in effect for three winters, allowing snowmobile and snowcoach use through the winter of 2006-2007.
