Vertical Axis Wind Generators

Is there a linear relationship between rotations going into a DC generator and voltage coming out?

I'm building a small vertical axis wind turbine for a school project. I wasn't getting the voltage I needed with wind from the fan I had, so I decreased the radius to increase the rotational velocity. When I halved the radius (and doubled the RPMs), the voltage more than quadrupled. Is this an accurate relationship? Or should the relationship be linear and some other factor accounts for the increase in voltage?

Generators are usually wound to be linear over their usual operating range. When running slower than that the voltage will increase with speed but with no guarantee of linearity.

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Eddy Vertical Axis Wind Turbine System Package from Urban Green Energy $6,695.00 Its a different kind of wind turbine - one thats nearly silent and looks more like art than your everyday windmill. Its a wind turbine that can be assembled in under an hour, take wind from any direction, and be mounted on either a pole or your roof. Manufactured by Urban Green Energy, the leader in vertical axis wind turbines, eddys a name you can depend on to produce clean energy for you day or ...

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Vertical Axis Wind Generator Demonstration

	Eddy Vertical Axis Wind Turbine System Package from Urban Green Energy Sale Price: $6,695.00
	Its a different kind of wind turbine - one thats nearly silent and looks more like art than your everyday windmill. Its a wind turbine that can be assembled in under an hour, take wind from any direction, and be mounted on either a pole or your roof...

	Eddy Vertical Axis Wind Turbine System Package from Urban Green Energy Sale Price: $6,695.00
	Its a different kind of wind turbine - one thats nearly silent and looks more like art than your everyday windmill. Its a wind turbine that can be assembled in under an hour, take wind from any direction, and be mounted on either a pole or your roof...

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