You're looking at one very clever piece of engineering. It's an Adams-Farwell air-cooled, piston-driven, rotary engine—one of our 10 Most Unusual Engines of All Time. The crankshaft is fixed, connected to the frame of the car, while the crankcase rotates around it to drive the vehicle. In this case, that's a 1906 Adams-Farwell 6A Convertible Roundabout. The buggy originally came with a three-cylinder of the same design, but Mr. Farwell himself yanked that engine and plopped in the 50-hp five-cylinder unit you see here.
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Watching it in operation is both terrifying and charming. Check it out in the video below.
This story originally appeared on roadandtrack.com via BangShift.
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