The Liberty 2.5 MW wind turbine from Clipper Windpower, Carpenteria, Calif., is Windpower Engineering’s first Turbine of the Month because its unusual engineering features address common industry headaches, most of them in unscheduled maintenance. Downtime often comes from gearbox stresses, swapping out large components, and unscheduled crane call-outs. The company’s Quantum Drive distributed drive train…