Abstract: A self-propelled hydrofoil surfboard includes a surfboard having a mast mounted to the lower surface of the surfboard, a selectively controllable thruster mounted at a lower end of the mast, a controller and a battery to supply power to the controller and thruster, the controller cooperating with a remote controller adapted to give control inputs to the controller and to be carried when in use by a rider, navigation lights mounted around at least a portion of the circumferential edge of the surfboard, and wherein the mast may have an adjustable length.

Abstract: A self-propelled hydrofoil surfboard includes a surfboard having a mast mounted to the lower surface of the surfboard, a selectively controllable thruster mounted at a lower end of the mast, a controller and a battery to supply power to the controller and thruster, the controller cooperating with a remote controller adapted to give control inputs to the controller and to be carried when in use by a rider, navigation lights mounted around at least a portion of the circumferential edge of the surfboard, and wherein the mast may have an adjustable length.

Abstract: A method and hand grip for use when scrubbing a greasy or badly soiled surface with a segment of corrugated or crumpled substrate such as metal foil. The metal foil can be commonly available aluminum foil wrap. The hand grip has a handle that carries a substantially planar support bounded by a distally projecting short perimeter wall to define a shallow volume, and the planar segment includes a plurality of distally, outwardly projecting piercing elements such as pointed sheet metal screws dimensioned and spaced to pierce and hold a crumpled wad of foil within the shallow volume, such that the randomly creased or corrugated surface of the foil is exposed, projecting distally away from the proximal handle.

Abstract: A safety marker suspension device which consists of a rod having a first end and a second end. The first end is attached to a safety marker. A plate is secured transversely to the second end of the rod. A housing is provided having a side wall defining an opening. The opening has a peripheral lip which matingly receives the plate. A spring is secured to and extends between the housing and the plate, thereby resiliently securing the rod to the housing. The housing is attached to machinery.