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. Sorry I did not
explain Betz's theorem, or 'tip speed ratio'. Buy my book 'Windpower
Workshop' and read the whole story :-)
The notes were originally a series of graphics file documents (GIFs)
written in a logical order.
To see them in GIF format go to Ian's site where I put them before I had my own page.
You need the Acrobat Reader to read
A free copy can be obtained by clicking http://www.adobe.com/prodindex/acrobat/readstep.html