Found on a dusty shelf…
Scrapyard Windpower Realities: Building Windmills with Recycled Parts by Hugh Piggott (1992)
Complete with diagrams:

And Basic computer program to help you design the blades:
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This entry was posted
on Wednesday, March 5th, 2008 at 9:31 am and is filed under design, environment, practice.
March 6th, 2008 at 10:04 am
10 PRINT “Going to get out my ZX Spectrum”
20 GOTO 10