Exactly how bike wheels are measured is slightly complicated, basically you want one which is about 63-64cm total outer rim diameter. 26" wheels can also be used but are less ideal.
The wheel should:
~ Not be quick release
~ Have a normal thick axle (about 9mm diameter)
~ Have 36 spokes
~ Run reasonably smoothly
~ Have enough axle showing to attach to your pole mount, at least 4cm.
These are pure aluminium sheets used in a printing process fairly common with newspapers and magazines. A medium sized printing company may recycle hundreds of plates every week, so it's usually easy to pick them up cheap.
Any size, thickness, or type is fine as long as they're larger than 67cm on the long axis.
Vertical Axis Wind Turbine which uses wind energy to drive things like an alternator/generator for producing electricity, or air and water pumps for cooling, irrigation and similar.
The turbine uses the 35-40% mechanically efficient Lenz2 lift+drag design. It is made almost entirely from scrap materials, and should cost about $15-$30 for the six vane version, which can be made by two people in four hours without much effort.
Created by Daniel Connell.
A small wind turbine, with power generator, controller and battery, providing up to 1000 Watt power (depending on the wind speed).