then look at his pic .
http://www.windstuffnow.com/main/darrieus_type.htm
...it might be best to print out this picture and
study it....
(DSC00002)
from the bottom...the part that 2 rods are stuck
into ...that part is attached to the drive shaft
..(vertical)
Okay next round part...is an eccentric...the center hole turns freely on the drive shaft...
those rods on it, go out to the swivel part of the
vanes...the vanes swivel as they rotate.
There is an offset hole...a little shaft is fixed
firmly with setscrews. A block slips over the stub
shaft...it is fixed firmly  to the stub shaft also
...which is fixed to the tail shaft...
I didn't understand it at first either, but it is
very simple once you grasp the concept....isn't it
Ed?
                   ( :>) Norm.
( :>) Norm