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KRISTI snowcat
KRISTI snowcats were 1950s/1960s tracked vehicles suitable for snow and other terrain and produced originally in Colorado and then later in Washington.
==KRISTI - Propeller drive before track drive==
According to the introduction, contained in the operators manual:
''The development of the KRISTI snow vehicles began in early 1947 in the form of a very unusual snow plane. This propeller driven vehicle utilized a control by which the operator could tilt the machine from side to side, in effect raising one ski and lowering the other to negotiate up to 45-degree side slopes and permit high-speed turns without skidding. This tilting and edging of skis after the manner of a skier was called "Ski-Action". Since it could do a "Christie" up or down hill, the trade name "KRISTI" was adopted.''
The Kristi snowplane featured a revolutionary change in ski handling concepts. As stated in the manual, the design was inspired by snow skiers who angled their skis to effect a turn (this angling of skis is called a Christie) and it allows for both higher speed turns and greater control. The theoretical advantage of the Kristi system in a snowplane would make for safer and faster turns on frozen lakes. The photos of snowplanes clearly show stationary mounted rear skis and a turning front ski, the Kristi design improved on this design by allowing the skis to carve their edges into the snow as traditional snowplanes's rear skis will skid laterally during a turn. The major advancement of the Kristi tilt ski system apparently made no impact on the commercial or amateur snowplane industry as it did not appear to be used in practical application. Perhaps because of the mechanical complexity of the original design, no snowplanes are known to exist that employ the "Christi Ski Action" concept.
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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