to provide a rigidizing influence over the entire rotating portion of the turbine many other structural systems may be utilized to assure that the frame assemblies 10 are maintained in their positions fig2 illustrates a typical one of the frame assemblies 10 of the driving portion of the wind turbine each of the frame assemblies 10 has a vertically oriented flat screen 50 fixed between a pair of spaced apart struts 40 and a pivot arm 60 which is vertically oriented and rotationally mounted between the struts 40 within upper 62 and lower 64 bearings arm 60 may also be non rotating as shown arm 60 is positioned to one side of screen 50 a flexible sheet 70 is fixedly mounted along one of its edges 72 to arm 60 the bearings 62 and 64 are attached to struts 40 as shown in fig2 the screen 50 may be of the type made up of crisscross wire construction or may be of other structural wire fabric construction with relatively open weave to minimize wind drag by allowing the maximum amount of wind to flow through screen 50 with least resistance fig2 shows a frame 10 with sheet 70 positioned away from screen 50 fig3 shows a frame assembly 10 with its sheet 70 pressed against screen 50 the operation of the wind turbine embodiment described above and shown in fig1 3 is readily understood fig1 shows the direction of the wind with three heavy arrows at the twelve o 39 clock position in the figure the wind force impacts the frame assemblies 10 on the right side of the turbine by pressing sheets 70 against their respective screens 50 as illustrated in fig3 the sheets 70 may be a light weight and highly.