Abstract: A wind-wheel for a wind-operated power generator comprises a rotor shaft, carrying the vanes of the wind-wheel, and mounted at its ends in rotary bearings supported by a frame. The frame is mounted on the top of a tower by means of a support member which itself is rotatable about a vertical axis through the tower. The connection between the support member and the frame enables the frame to be rotated about a horizontal axis below the bottom of the vanes. In a high wind, the wind-wheel can, thus, swing out of the vertical plane, spilling wind from the vanes, to avoid damage.

Abstract: Mounted on a vertical axis there is a horizontal axis and, vertically spaced therefrom, a wind wheel generator and counterweight unit. When the wind speed exceeds a predetermined limit, the unit is swung thereby, in a vertical plane, decreasing the effect of the wind on the wheel and protecting it from overload.

Abstract: A system of spars, each having a rectangular cross-section, is provided by placing the spars in lateral juxtaposition to one another like a plank to form a rotor blade. A skin of plastic foam is provided on the blade. The cross-sections of the spars, and the corresponding cross-sections of the blade, are varied in accordance with aerodynamic requirements. The spars are kept in position by means of clamps and/or connections and/or rings, forming an integral unit similar to a plank; and the integrated spars are directly attached to a hub or an electric generator.

Abstract: An electric generator arrangement has at least two wind or water wheels rotatably mounted on a common stationary shaft and coupled such that they rotate in opposite directions with a given ratio or a progressively variable ratio. The wheels carry the two cooperating parts of a first generator and may also each carry the rotor of a second or third generator cooperating with a stator on the shaft, the field excitation or current loading of the second and/or third generator being used to control the speed of the wheels.