Abstract: A surfboard for use by riders on bodies of water is disclosed having first and second apertures extending through the surfboard from the bottom side to the top side, angled such that each aperture has a first opening on the bottom side and extends at an angle toward the tail end of the surfboard to a second opening on the top side of the surfboard. A first channel disposed within a portion of the bottom side of the surfboard, terminating at the first opening of the first aperture, and a second channel disposed within a portion of the bottom side of the surfboard, and terminating at the first opening of the second aperture, the first channel and second channel separated by a raised portion of the bottom side, thus defining a trimeran profile on the bottom side, the trimeran profile having a first and second rail, and a center portion.

Abstract: A snowboard having a contoured bottom surface wherein a raised profile near the center of the bottom surface defines a pair of parallel, longitudinal channels through which snow is directed toward the tail end of the snowboard. Inboard from the tail end, aligned with at least one of the channels, an aperture is located that allows snow to be ejected vertically, forming a plume or rooster tail of snow as the rider passes over the snow.