 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.