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Windmill 2

Motorbike chain windmill

(Click to enlarge photo)

Small windmills rotate at up to around 700rpm so this was an early attempt at a cheap way to increase the shaft-speed to drive a car dynamo (like an alternator but without the electronic controller). The propeller span was around 1.8m diameter which, in my opinion, is too big because the susceptibility to storm damage is too great. It did work well but the dynamo wasn't powerful enough to slow the propeller down during times of high wind-speed. Although I could have tried a larger dynamo the price and weight would have been a problem so I started looking for better alternatives. Another problem was that the chain was very noisy too. I chose a chain in the first place because it is more efficient than a v-belt and fairly cheap, the cog-ratio was about 3:1.


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