 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."