SKIS ON SKIDS Russian patent published in 2015 - IPC A63C5/44 

FIELD: transport.

SUBSTANCE: ski comprises load surface, side faces, sliding surface with guides extending along the ski and having a horizontal sliding surface. Guides are composed of two pairs of skids arranged at ski slide surface, in symmetry at extreme positions relative to its lengthwise axis. Every said pair comprises external and internal skids changing in stepwise manner one into another in ski cross-section while internal skid step width is several times larger than that of external skid. In compliance with this invention internal skid width makes 6-8 mm while that of external skid equals 1.5-2 mm. External skid step height is 1.5-2 mm larger than that of internal skid step. Ski slide surface between said skids features convex or concave shape. Said skids are arranged over the ski entire length to come to naught at its tip. Load surface is inclined at not over 10 degrees to the ski side face. Transition between both skids is inclined to the ski lengthwise axis. Flute not over 3 mm in depth is made in every side face over the ski length.

EFFECT: higher speed on snowy road.

8 cl, 1 dwg