Electric planers are designed to remove a thin layer of material from a piece of wood. These are available in hand held versions and stationary versions. These are useful for fine woodworking to home building.
Electric power generating windmills consist of a blade with variable pitch and spanwise twist. The windmill includes a hub, which are supported on top of a tower for rotation of horizontal axis. Linkage mechanisms connect the roots of the blades to the hub to permit selective independent rotation of the roots and the tips of the blades for varying the pitch and the spanwise twist of the blades. It is connected to a hub. The aerodynamic properties of the blades are adjusted by the control mechanism to permit the generation of electric power under most wind conditions. It does not require an extensive supporting tower.