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Photos of Southwest Windpower Whisper Wind Turbines by Paul Gipe

Whisper was a line of mini wind turbines developed by Elliott Bayly’s World Power Technologies in Duluth, Minnesota. He sold the line to Southwest Windpower sometime in the early 2000s.

The Whisper H40 was the most advanced of the series developed by Bayly. It used a carbon fiber rotor 7 feet (2.1 meters) in diameter and swept near 40 square feet (3.6 square meters)—the reason for the designation H40.

The turbine was “rated” at 900 W, though during tests at the Wulf Field in the Tehachapi Pass, the turbine never delivered its rated power at its rated wind speed.

The Whisper H40 was inexpensive and, thus, a popular choice for battery-charging applications. It was relatively quiet.

The turbine tested at the Wulf Field performed reliably for five years before it failed.

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