Abstract: An aerodynamic and hydromechanical hydroplaning disc with a solid unitary body comprised of aggregated material. The disc is heavier than the water it displaces and non-floating. The peripheral edge of the disc is formed with a top to bottom curvature having a relatively smaller radius at the top than at the bottom of the disc which reduces air resistance and has a shape to increase the planing capacities as the disc strikes the water. The texture of the material is also significant in combination with circular or polygonal edge formations to enhance the aerodynamic, hydrodynamic and hydromechanical characteristics.

Abstract: An aerodynamic and hydromechanical hydroplaning disc with a solid unitary body comprised of aggregated material. The disc is heavier than the water it displaces and non-floating. A series of longitudinally oriented (i.e., meridionally oriented, or north-south) discontinuities are provided only on the extreme latitudinal periphery of the rim adjacent to the top and bottom surfaces of the disc. Said discontinuities: exert a greater interfering effect on the airflow and waterflow around the circumference than over the top and under the bottom surfaces; create a turbulent, separated and unseparated, peripheral boundary layer in air and water; reduce air resistance and water resistance; increase range, frequency of skips, and dynamic stability. Also, there is provided a granular texture on the bottom and circumferential surfaces of the disc which results in a more sure grip and improved hydroplaning stability (i.e., the ability of the disc to maintain a horizontal orientation while hydroplaning).