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tundra tire
A tundra tire (UK: ''tundra tyre'') is a large low-pressure tire used on light aircraft to allow operations on rough terrain.
A common variant of tundra tire is the bushwheel. These tires include an integral inner tube with the valve manufactured into the side-wall, allowing the tire to operate at very low pressures without risking shearing-off the valve stem and causing a flat tire. Low pressure tires provide greater cushioning and enable aircraft to land on rough surfaces, unsuitable for normal tires.〔(【引用サイトリンク】Alaskan Bushwheels )〕〔(【引用サイトリンク】Crazed Pilot - Alaskan Bushwheels )〕 Bushwheels are a common modification for backcountry aircraft.〔(【引用サイトリンク】Backcountry Pilot Knowledge Base )〕
==History==
The tundra-style tire has been independently invented at different times and places. In North America its post-World War II invention is credited to Canadian Welland Phipps,〔 potentially inspired by the Goodyear Tire & Rubber Company's pre-World War II development of their own, similar low-pressure "airwheel" as a complete rim and tire set — said to be of the "Musselman" type from , for its original inventor, Alvin J. Musselman — which was introduced to the American public in the late summer of 1929, and becoming available in the United Kingdom by 1930. It was initially offered by Goodyear in fully inflated diameters up to 46 inches (117 cm).
Phipps designed and constructed his own balloon tires in the period after the Second World War and fitted them to a Piper PA-18 Super Cub. Phipps then went on to provide air transportation to much of the Canadian high arctic region. He later established his own airline, Atlas Aviation, which operated a fleet of De Havilland Canada DHC-6 Twin Otters on balloon tires. Using the tires, Atlas's DHC-6s established airline service to such remote communities as Resolute, Nunavut and Grise Fiord, Nunavut.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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