This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Controllable pitch propeller schematic crp. en handdrawn picture of controllable pitch propeller drawn after model from within the book The Sailors Handbook by Halsey Herreshoff Controllablepitchpropellerschematic UTC Controllablepitchpropellerschematic KVDP derivative work Bukk talk cropped without caption bukk Controllablepitchpropellerschematic