windmill, no nothing to grind.
wind turbine, no, flat fins not aerofoil profile, energy extracted goes with cube of wind speed.
toy for children to run around with.
Motivation for post: homework : most probably.
"my friend" GF's homework, hoping to impress by saying he did it for her.
Fun rating 9/10.
Now for the real thing.
A Freecad model to cut windturbine blades from Piggot's famous Scottish wind generators may actually be useful. I have "a friend" who went on a course and actually made one from Douglas pine, using a spoke shave. One of my general ideas of getting into cnc was that would be a cool thing to make.
one of the neat ideas in this design is the furling hinge, which automatically puts it side-on in the case of strong winds.
This is a very successful, low tech, design with hundreds of working installations. IIRC Piggot originally got a lot of folks in scottish isles, with no grid, energy independent.