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Wind turbines use an aerodynamic effect to rotate blades and transform kinetic energy into mechanical energy, the mechanical energy then transformed into electric power through a generator or alternator. The modernized wind turbine can achieve power conversion efficiency between 20% - 40% from the wind.
Unlike the large commercial type horizontal wind turbines, small wind turbines have been widely used to provide distributed power for a variety of purposes around the world, such as on or off grid residences, telecommunication systems, street lighting systems, remote monitoring systems, yacht battery charging systems and  a variety of other purposes that need energy where there is no electric grid, or where the grid is unstable.
In general there are two different types of wind turbines, vertical axis and horizontal axis turbines, these both utilize different methods of extracting energy, both designs can have significant  advantages over one another depending on the correct application.
Type of Rotor Aerodynamic Axis Self Start CP Key Negative attributes
Propeller Lift Horizontal Good High Noisy, need to be orientated, High gravity
Darrieus Lift Vertical Poor High Poor self start, Centrifugal stresses
Savonious Drag Vertical Good Low Poor efficiency, small swept area
Vertical wind turbines offer quiet Omni directional workability with no need to orientate towards the prevailing wind direction as is seen with propeller type turbines, they offer great performance in turbulent conditions. Vertical turbines are perfectly suited to High Density installations where they are able to be placed much closer to each other than propeller type turbines, the air that flows in and around each turbine moves more efficiently. This is due to the natural vortex motions of air currents, similar to water flowing in between and around each fish as they swim as a school. The fish seemingly swim effortlessly up current, these eddie currents have the effect of enhancing the performance of the neighboring vertical turbine as it flows through,  the propeller type turbines corkscrew the air flow for a considerable distance before returning to a clean flowing un-tubulated state which is necessary for propeller type turbines to work efficiently.
 Rotogen Turbo Blade Vertical Turbines have been designed to capitalize on natural vortex motions of the wind, they have very few parts for simplicity and maintenance with low wind starting speeds, Variable load PM generators and monitoring stations as well as the ability to use Constantly Variable Transmissions (CVT) for speed control between a turbine and generator.
3 models of turbines, each designed for different applications, a full variable pitch flight controlled unit that constantly adjusts the Turbo Blades angle of attack to the intercepted wind force, balancing torque load and generator speed, increasing the wind working range and harvesting efficiency,  and fixed pitch style workhorses designed with simplicity and performance for cost effectiveness versus application.