Radial aircraft engine diagrams are found in Google.com's Patent section, Douglas-Self.com and Mekanizmalar.com. Google Patents searches and displays the full text of patent grants and applications from around the world.
Douglas-Self.com offers images, animations and the history of multiple aircraft engines. It also has a section on retro technology, unusual steam locomotives and audio design and technology.
Mekanizmalar.com has a wide range of diagrams, videos and flash animations. Sections on engines, gears, indexing, pumps and linkages are located there. Also available are sections on couplings, pneumatics, electronics, Arduino microcontrollers and reciprocations. The author produces content divided into categories including cams, thermodynamics and power generation.