I'm in the process of putting together a small turbine based upon Ben's 100w plans and have a few questions regarding the (aluminium) blades, that I'm hoping some one might have more experience with.
1. How do the blades compare with others, eg those created from plastic tubing? What are the best blades - purpose carved wooden ones? For these Ametek based turbines is there much to be gained from using a "better" blade design instead of the Ali blades (if such a thing exists)?
2. The plans are for blades 33" in diameter, with a caveat not to exceed 48". Has anyone tried other sizes, especially ones up to 48"? Any gains?
3. Presumably the part of the blade "bent up" acts as the leading edge and the turbine turns in the direction of this edge. Is this correct?