 The original Kristi snowplanes  were very similar to the earlier Russian Aerosani snowplanes which were developed as early as World War I.The Kristi design was more advanced than the Aerosani, and utilized adjustable ski action to perform higher speed turns and received a patent for its design in 1955.Other competitors in the Snowplane market that failed to transition into tracked vehicle makers when the market changed included the Lorch Snowplane, the Steadman Snowplane, the Fudge Snowplane, the Lansing Snowplane in addition to many smaller manufacturers and homebuilders.