Ship engine piston cutaway.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...y_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...on_cutaway.jpg
Previously:
https://www.homemadetools.net/forum/...017#post168251
https://www.homemadetools.net/forum/...496#post166517
https://www.homemadetools.net/forum/...145#post141459
https://www.homemadetools.net/forum/...129#post120808