what do you need 120m of lead wire for????
Funny, My Dad and I built one of these for my science fair project almost 15 years ago...
What we did was get an old alternator from a car, and built the entire structure from steel. It was shaped with three fan blades. And the main shaft was connected to the alternator with a rubber puller belt. When the wind hit the blades, it turned the shaft which turned the wheel on the shaft and then the alternator. The alternator was connected directly to the battery, and we connected a 12volt light to the battery with a switch.
Heres a basic diagram...
**broken link removed**
You will need to get a really straight steel shaft and mount it on bearings... a simpler solution I suppose would be to built this all on a much smaller scale... maybe build it with wood, and use a bicycle dynamo, you could even power a small fan with the circuit which would blow the turbine, and you will have 'perpetual motion - haha'... that could be cool... good luck!