Vertical axis wind turbine technology continues to improve

By Paul Dvorak John Yan, China,
Most wind turbines fall into one of two general categories: horizontal axis and vertical axis. Each can be further divided into small and large wind turbines.
Wind turbines can be classified as utility scale and small scale and then into a horizontal axis (HAWTs) and vertical axis versions (VAWTs).
The technology for traditional horizontal axis wind turbines (HAWTs) have been in development for more than a hundred years. This technology includes blades and their manufacturing, gear boxes and their manufacturing technology, pitch angle devices and their technology, and so on. The technologies are very mature. Betz’s Law, which defines

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