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Small Wind Turbine Design Notes Notes based on a session during the Centre for Alternative Technology Windpower Course Notes written and taught by Hugh Piggott with input from Claus Nybroe. Hugh Piggott writes: The first time I did this talk at CAT they threw me in with no preparation, "Just come as you are!" and I had to wave my arms about a lot. Since then I have done it countless times, but I still get more than a few blank looks. It's probably the most obscure bit of the course. Finally after about ten years, I have produced a full set of notes. I am so pleased, I asked Ian to put it on his site, and he has! Thanks Ian. Sorry I did not explain Betz's theorem, or 'tip speed ratio'. Buy my book 'Windpower Workshop' and read the whole story :) Content Defining drag vs lift forces Finite element blade design The maths of lift and drag Setting the best blade angle Shape of the apparent wind Optimising the chord width 'Back of an envelope' design Factors affecting power coefficient Ideal shapes and practical limits Pros and cons of high speed rotors Variation of size and twist windmill blade page 2 page 3 page 4 page 5 page 6 page 7 page 8 page 9 page 10 page 11 page 12 Defining drag vs lift forces Finite element blade design The maths of lift and drag Setting the best blade angle Shape of the apparent wind Optimising the chord width 'Back of an envelope' design Factors affecting power coefficient Ideal shapes and practical limits Pros and cons of high speed rotors Variation of size and twist in a 2.3mdiameter wooden windmill blade [...]...Pros and cons of high speed rotors Variation of size and twist in a 2.3mdiameter wooden windmill blade