I am looking for engines...

I am planning a couple of projects (sawmill, power plant, pumping station) that will require models of engines. So far, I have found the engine in the Albatros model airplane looks good.

Does anyone have suggestions of paper model engines I could consider? I model in 1/24 (but scale isn't of great importance in engine... size is relative) and in the late 1930s era.

thanks!

Ken