Abstract
ABSTRACT A modern wind turbine, an Enertech Model 44/25*, was installed on May 26, 1982, at the USDA Conservation and Production Research Laboratory, Bushland, TX. The wind machine, acquired for a determination of agricultural applications, had a 25-kW induction generator which provided 240 V, 60 Hz, single-phase electric power. The horizontal-axis wind turbine had a 13.4-m diameter, three-bladed, fixed-pitch rotor and was mounted on a 24.4-m tower. The blades were laminated epoxy-wood attached to a steel hub. The wind turbine operated 64% of the time, and was available for operation over 95% of the time. The unit had a net energy production of over 100,000 kW-h for a 20-month period in an average windspeed of 5.9 m/s at a height of 10 m. Power curves were established for the wind turbine at two different pitch settings and with two different sets of blade-tip brakes..
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