the only existing 5 cylinder radial engine Adams Farwell horseless Carriage (1906) ... is in the Reno Nevada located National Automobile Museum

Well, that makes a new engine type I've never seen or heard of before to add to the list of unique engine designs...

Thanks Steve!

radial engine ear candy

Found on http://bangshift.com/blog/monster-engine-video-a-28-cylinder-3000hp-pratt-and-whitney-r-4360-starts-for-the-first-time.html