ANY WW2 Historians here??

On the topic of radial aircraft engines...I recently saw a couple of neat videos that show how they work:

[ame="https://www.youtube.com/watch?v=qjnQKXNPsk4"]How a Radial Engine Works - Explained Part 1 - YouTube[/ame]

[ame="https://www.youtube.com/watch?v=R71Xhrkc3EQ"]How a Radial Engine Works - Explained Part 2 - YouTube[/ame]