here's the windward side of the blade.
Yesterday afternoon, winds were 20 mph, gusting to 36. I pulled the fuses to allow the generator to freewheel. It did not overspeed. I heard them gently stall instead and they seemed to maintain a constant rpm. My NACA 44XX would have gone ballistic!
IMHO, these blades were easier to carve than the NACA 44XX were. The thin laminates of plywood served as a guide to indicate the blade unfiormaty and thickness.
