National Renewables Cooperative Organization (NRCO)
4140 West 99th Street
Carmel, Indiana 46032-7731
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A typical horizontal wind machine stands as tall as a 20-story building and has three blades that span 200 feet across. At the tip of the blades, they're moving over 200 mph. This means high efficiency and low torque which contribute to good reliability. Some models operate at constant speed, but more energy can be collected by variable-speed turbines.