Abstract:
The quad parabolic snowmobile ski is an elongated body having a top side, a bottom side, a tip at the front end, a rear end, a pair of symmetrically opposed ski parabolic cutting edges disposed longitudinally along the bottom of the ski, and a keel. The keel is attached to the bottom of the ski and has a central median ridge, i.e., a keel rail, a substantial portion of which protrudes below the bottom of the ski to form a central and longitudinal point of contact with the snow. The keel defines symmetrically opposed snow-funneling channels along the opposite sides of the central median ridge. Varying radii of curvature of the channels form parabolically-shaped channel outer sidewalls. Symmetrically opposed keel parabolic cutting edges are formed by contouring a keel body width to follow the contour of the parabolic shaped outer sidewalls at a constant cutting edge width.