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dpb

On 7/21/2011 1:29 PM, wrote:
....

If you look at the old stereotypical "prairie" style windmills, that's
how they are. A disk with pie-shaped blades angled at 45 degrees,
facing directly into the wind with the help of a fin.
....

None I've seen were actually flat, though. All ours had a curve built
into the blades; steeper front attack angle than rear. Dated from
roughly 1910 on thru the 20's...

The old Delco Windcharger (mid-1910s when ours installed; not sure when
they were actually introduced) did have a three-bladed hub; not quite so
aerodynamic as current but certainly reminiscent.

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