A PVC sheet turbine

 

Material needed (square PVC sheet, some disks, screw-rods, alternator, ...)

 

Prepared sheet and fixed to rotor base (thin plastic disk, four screw-rod and nuts)

 

Done!

 

This is a 3-bladed version made from triangular PVC sheet. It runs very good, I think better than 4-bladed types and has higher TSR (tip speed ratio).