A propeller having a plurality of blades extending radially outward from a hub, the blades forming a loop. Each loop can have an intake portion, an exhaust portion and a tip portion extending radially outward from the hub and a gap between the intake root and the exhaust root.

An electricity generating apparatus has a turbine between two vertical water-tight towers on a floating base that may be managed to attain a buoyancy such that the towers protrude above a water surface and the turbine remains below the water surface. One tower has an upward extending air conduit with an air pump driven by wind vanes at an upper region. The turbine is adapted to be driven by both wave motion and by tide currents, and an air manifold beneath the turbine, fed with air from the air pump, feeds air to aid in turning the turbine, which in turn drives a generator in one of the towers.

A propeller having a means for creating fluid flow in a non-axial direction and redirecting it in an axial direction.

A propeller having a means for creating fluid flow in a non-axial direction and redirecting it in an axial direction.

A propeller having a plurality of blades extending radially outward from a hub, the blades forming a loop. Each loop can have an intake portion, an exhaust portion and a tip portion extending radially outward from the hub and a gap between the intake root and the exhaust root.

A propeller having a plurality of blades extending radially outward from a hub, the blades forming a loop. Each loop can have an intake portion, an exhaust portion and a tip portion extending radially outward from the hub and a gap between the intake root and the exhaust root.