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Blades or Propellers
There are volumes of books about blade design. It is one of the most discussed and theoretical aspects of wind generators. However, there seems to also be a body of thought that many simple designs will work relatively well. One can spend many days (as we have for ours) in making a set of blades or there are blades described here that people say that the have put together in a matter of just a few hours.My thought is that in a nuclear recovery situation the idea may well be to get something up and working as quickly as possible and then once one has the opportunity to do so there is much information here that one can use to experiment and make up their own mind about the trade-off between the efficiency gain from blades that take much longer to build and those that work less well or don't last as long but are quicker to make.
Propellers: Technical info on how to build blades
Propellers: And still more info on how to build blades
Blade Design: Some neat diagrams on blade design.
Blade Design: A blade in one hour.
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The blades for windmills are designed and work just opposite of those for airplanes. We are carving ours out of basswood because the wood is "clear" (that is to say the wood has no knots). Other kinds of wood will do, but there is a real art to carving the blades. On my right is a block that we start with and on my left the almost finished propeller blade. Immediately following are the drawings that Ed drew for our blades.
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In this first drawing you see the rough shaped block of wood
and how it is marked out into "stations".
Take note that there is a leading edge and a tailing edge.
The leading edge is wider and blunt. The area behind the trailing edge is what is being cut away.
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