an upper static support structure 22 secured to a lower support structure 24 at the center of the upper support structure 22 is a rotatable vertical turbine drive shaft 26 secured thereto by typical bearing members 28 and preferably connected to a speed increaser or gearbox 30 also secured to the upper support structure 22 a power generator member 32 is furthermore mounted on the gearbox 30 it shall be understood that the drive shaft 26 may be a plurality of shaft sections not shown with mating flanges on them for preferably bolting the sections together the turbine drive shaft 26 supports the rotor assembly of the turbine device 20 that includes at least two preferably six blade members 34 substantially vertical and parallel to the shaft 26 the blade members 34 are equally and circumferencially spaced apart from each other around that shaft 26 each blade member 34 is vertically pivotally mounted at its extremities onto a pair of top and bottom rigid support struts 36 preferably horizontal and all secured to the shaft 26 as shown in fig2 each vertical blade 34 is secured to its horizontal support struts 36 at the extremities of an inner tube 48 a plurality of retainer attachment members preferably support lugs 38 shown on fig2 and 4 are rigidly secured to the inner tube 48 a first extremity of a plurality of intermediate retainer members 40 preferably substantially horizontal is preferably rotatably secured to one of the support lugs 38 the second extremity of each intermediate retainer members 40 is secured to the shaft 26 each blade member 34 is linked to a common control.