Abstract: A frost-resistant windmill is disclosed to provide supplemental power supply for use preferably in large cities. The frame of the windmill carrying a plurality of blades is made hollow defining a serpentine internal air pathway adapted for introduction of warm air from an external source to prevent freezing when used during winter months. A centrifugal speed adjustment system is provided to reduce rotation speed fluctuations of the load drive shaft when strong wind gusts are encountered. A speed adjustment weight is connected to the drive wheel through a cable such that the position of the drive wheel along the radius of the windmill is defined by an equilibrium between the pull force on the cable and the compression force of the spring urging the drive wheel towards the periphery the windmill.

Abstract: The Mark BELA-I Solar Engine converts solar energy into continuous mechanical movement.

Abstract: Field of the Invention This invention represents a rotor-type wind turbine with “scale” type double-blade wings. The name of “scale” or “scales” is given to the vertical swinging plates in the vanes of the windmill because they are located so as to overlap one another. The wind turbine converts the energy of the wind into mechanical energy. In construction the turbine consists of a vertical shaft running in ball bearings under the force of the wind impinged on the horizontal wings located and connected at right angle with the vertical shaft. Each wing is divided by the vertical shaft into two vanes. Each vane is fitted with a few stationary vertically-disposed posts, and each post has a hinged vertical “scale”, whereby the direction of rotation of the vertical shaft does not depend on the direction of the wind. Through a friction drive the vertical shaft transmits rotation to the secondary (driven) mechanism which is located horizontally.