Abstract: A water flow deflection device to enhance a watercraft's wake. An elongated base with two ends is aligned along the side of the watercraft. The base has a deflector interface with concentrically arranged teeth. A deflector assembly is operably attached to the base between the two ends, with a face that deflects water. The deflector's leading end is closer to the watercraft than the trailing end. The deflector assembly has a base interface with concentrically arranged teeth. Two or more suction cup assemblies attach to the elongated base to provide removable attachment, with one attached between a first end and the deflector interface and another attached between a second end and the deflector interface. The concentrically arranged teeth of the deflector interface and the base interface operably interlock, allowing rotational adjustment of the deflector relative to the base.

Abstract: An apparatus for providing stability and reduced turbulence to a surfboard that is moving along its longitudinal axis includes at least one opening that passes through a surfboard fin when viewed from the side. When viewed in cross-section, each opening includes an optimized tapering profile that extends around an interior perimeter of the opening which reduces turbulence, and thereby lessens drag when the surfboard is moving forward in the water in a direction that is parallel to a center longitudinal axis of the surfboard and fin. The apparatus also significantly reducing side to side resistance when turning the surfboard.