Parasitic Wind Turbine

Step 2 The Rotor

In the vein of keeping the design simple I wanted to have a simple rotor. My solution was to pull the blade assembly off of a cheap box fan that had reached the end of it's life. The rotor had been attached to the fan on a 1/2 inch shaft. To accommodate the 5mm shaft on my stepper motor, I press fitted a half inch dowel into the fan and then bored a 7/32nds hole through the dowel, and split the end of the dowel with a razor saw to allow the use of a hose clamp to secure the fan to the motor shaft.