Instructables

Step 4: Making the blades and hub

Picture of making the blades and hub
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The blades and hub was made with a PVC Pipe and MDF respectively( again material choice is dependent on availabilty and properties).
PVC pipe was used because the curve inside the pipe makes it possible to pitch the blades at a desirable angle and also it strong and haevy enough to withstand wind pressure and at the same time produce more torque.
The blade shape is dependent on the direction you want it to rotate(clockwise or anticlockwise), this shape ensures the wind blows the blades in a clockwise direction.
the hub
the hub was created in such away that the blades are slanted at 30 degree angle(again through testing it was found that having more blades produced more voltage but with this setup the maximum blade the hub could hold was six)
 
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