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No, this was not a reference to the propeller-driven machine by D’Harlingue: on the front cover was a monstrous monowheel creation by a Professor E. The centre wheel was powered by a 250 hp airplane engine, which Christie hoped would give this “Mother of all monowheels” a top speed between 250 and 400 kph.Although the front cover of Popular Science Monthly from April 1923 depicted it on a racing track, we have no idea what ever happened to Professor Christie. The 1920s, however, also saw the introduction of a few more ‘sensible’ motorized monowheels, which were really aimed as useable one-wheeled motorcycles.Georg Bergner from Washington, Missouri managed to get to the patent office with his ‘Monocycle’ design just hours before Allen Greene and Elisha Dyer from Providence, Rhode Island showed up with theirs on that summer’s day of June 22, 1869.
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A propeller-driven monowheel As if the concept of the (motorized) monowheel itself was not dangerous enough, American inventor Clinton T.
Coates got the ‘brilliant’ idea of fitting propeller-drive to one.
It was in that wacky time that the idea of the even wackier monowheel was born; a vehicle with one large wheel with the rider and drive-system inside its circumference.