These parts look good. If you want to make the rotor smoother, turn on the grid, set number of axes to 3, add a circle to each corner of a triangle (make sure they partly overlay), now use combine shapes -> intersect in two of the circles, result: a smooth rotor.
@Xray - That's a very good idea. I'll upload a message scene and I want to make contest but I don't know how long it should last. Is a week long enough?
@alasmyfoe - you shouldn't put it in the red car folder.
Save your animation loaded in my scene. Next click here. Than click "Add scene response" and upload your scene.