Monowheels: Page 2
The D'Harlingue Monowheel with its inventor in 1917. From this photograph you can see that the Popular Mechanics cover was actually a pretty accurate depiction of the machine- hats off to all concerned. It is not really clear if the propellor was accurately pictured or not- it doesn't look like a standard aeroplane propellor, but then it was expected to produce thrust at a much lower forward speed. The prongs at the front are clearly intended to stop the propellor from striking the ground.