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Hay Ken:

Thanks for the concern and the referral to knowledgeable works, I will look into then.

Knowledge and learning are worth the money spent. You just never know when the next brilliant mind will awaken to a stimulus. 

I do understand about engineering limitations. You change one thing and it will affect all other parts of the system.  We will be careful and take proper safety precautions.  Actually, one of the modifications that has been suggested is a venturi type cone around to impeller to compress the air flow, increase the wind speed and depart greater energy to the blades. The shroud should add protection from blade failure as the wind speed increases.  It should also improve centering and tracking wind flows. That's one of the cool things about being a HS Teacher, Metal Shop is just down the hall.

I'm very excited about the project.

Keep the Ideas coming!   Thanks

Bob