If you’ve got thirty minutes and a fascination for fabrication, then perhaps this video’s worth a view or two. Lets Learn Something posted part one of his three-cylinder radial engine project.
Radial engines aren’t totally outside of our spectrum of topics because however quirky these engines are, some people have been nutty/ingenious enough to fit them in a motorcycle’s chassis. On top of that, the engines used in this video were from Hondas.