Speaking of aircraft engines, here's a radial 9-cyl diesel.. not from an airplane though, but lot of airplanes had radial engines so it might be of interest.
Very cool!

http://www.youtube.com/watch?v=zGLVtA3LHlE

Got to love the comment
"cool. I dont understand whats a radial engine and cold start?Sorry I build turbo hondas..So know nothign about this. but seems interesting."

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Tomas, Sweden
1966 Mercedes Benz 230S with OM617.912, automatic. Disk brakes from W108
1983 Mercedes Benz 300TD grey, OM617.912 and 5-speed manual
1983 Mercedes Benz 300TD blue 7-seater, OM617.912 and 5-speed manual