The wind turbine nacelle is made as follows.
1. It is necessary to block the wind to turn the propeller. The rotor inside the top of the tower turns the drive shaft. The drive shaft is connected to a gearbox to turn the generator to produce electricity.
2. Use fiberglass to make an aerodynamic hull. Vacuum pack the fiberglass sheets and bake them in a cylindrical oven to form two halves of a perfectly homogeneous shell.