The bolts 176 are allowed sufficient axial space to allow for axial motion between the rotor 171 and generator.
In keeping with the goals of low cost, it is desirable to construct the vanes of the wind turbine from low cost and readily available material sheets, instead of molded composite or thick formed metal vanes that would be very expensive.
The vane material is preferably a high toughness and good UV stability material.
The radial rib members 195, which can be CNC plasma cut or manufactured by other low cost means, have two ribs 198, 199 that induce the curve shape on the vanes, not shown, when installed.