Frank Has A 9-Cylinder Motorcycle

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Putting a 9-cylinder 150 horsepower Rotec Radial R3600 aircraft engine on a custom chopper frame with a tiny propeller is just as insane as putting a 10-liter radial engine into a Goggomobile. It's nuts, and wonderfully so.

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This took 18 months of German engineering by Frank Ohle. What do you think?