Subject: [Homestead] Wind turbine late notes, six-bladed 4.3 mph startup
Date: Sun, 07 Nov 2004 15:15:29 -0800
This is stuff I ran across in a futile attempt to find information on a
counter-balanced tip-up windturbine pole, which doesn't need a blade
brake, old Jacobs pitch-control etc. to limit rpm's in a high
wind---the tip-up lays over in a high wind, the amount dictated by the
counterbalance weight of sand, cement, whatever.
I've got some such tipup pole designs in my architectural files, but
damned if I can fine any that made it into the yo-yo search engines
which don't search for a damned thing but the number of previous hits.
http://www.windpower.org/en/tour/design/
(wind turbine towers and blades both oscillate at different
frequencies---around three second for towers, one second for blades.)
http://www.otherpower.com/trips3.html
(how to design, build, reproduce a wooden windturbine propellor
blade---airplane modelmaking magazines have archives on making blades
from foam, forming the airfoil sections with nichrome hot wire, covering
the toam with epoxy and glass cloth.)