OK Patrick, some pointers if I may.
Your foil shape is not bad, but you need to move the thickest part of the blade towards the trailing edge, and it needs to be thinner at the tip, also round the transition from the upwind side to the downwind side at the leading edge, that will reduce the turbulence there. Washout or twist is vital, the blade will turn in the wind at 10 degrees, but will never "fly"
My blades used to spin at a speed that "filled the circle" ie in theory no wind passed through the disk covered by the blade without imparting its energy to the blade.
Your blade looks better than my early efforts, so good on you.
Suggest you will be happier with a permanent magnet motor than with an off the shelf alternator.
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