Concerning these new, now broken blades.
With my friends I've been experimenting with quite similar blades a bit more. Another friend of mine made a four blade wind rotor of 3,5 m using similar methods. That rotor didn't have any real airfoil shape, but anyway it worked very well. It is a direct drive axial flux PMG machine. It is not in use now, because the tower is used to hold up another a bit bigger machine.

I had quite much email correspondence with an Australian guy, who started to make similar looking blades, in Fiji.

I tried to convince 'Eki' to make a new set of two very similar blades as shown in the pictures. But now he has got almost ready a new wind rotor of 8,5 m with eight blades. The blades look quite similar as the blades of that 'Reinikainen' machine. I will post here on this board some pictures later.