Patent ID: 7980810
Filing Date: 2011-07-19
Classification: F03D,F05B,Y02E,Y02P

Abstract:
1. A lift-type wind turbine, comprising: a substantially vertical rotating shaft; a plurality of substantially vertical blades secured to said shaft, each of said blades further comprising a front portion, a rear portion, and a pivot axis pivotally securing said rear portion to said front portion, wherein said rear portion is operatively arranged to pivot relative to said front portion; bottom edges positioned on each of said front portions, wherein each of said bottom edges is arranged substantially equidistant from said shaft proximate a first circumference extending substantially horizontally about said shaft; and, top edges positioned on each of said front portions, wherein each of said top edges is arranged substantially equidistant from said shaft proximate a second circumference extending substantially horizontally about said shaft, wherein said second circumference is smaller than said first circumference; wherein said front portion further comprises a rear cover operatively arranged to at least partially cover an outer surface of said rear portion.