Quote:


The speed that counts is the at the armature near the center, not out at the end of the blade.


Oh, I know, still impressive though. I think I calculated out that at a normal wind velocity of 20 mph, a 90 meter turbine has a tip speed of about 120mph! Sure doesn't look like that when you sit and watch them though, even when you stand right under those blades like I did in Germany...