Flying Machines
Maxim's father had earlier conceived of a helicopter powered by two counter-rotating rotors, but was unable to find a powerful enough engine to build it. Hiram first sketched out plans for a helicopter in 1872, but when he built his first "flying machine" he chose to use wings. Commencing work in 1889, he built a 145 feet (44 m) long craft that weighed 3.5 tons, with a 110 feet (34 m) wingspan that was powered by two compound 360 horsepower (270 kW) steam engines driving two propellers. In trials at Bexley in 1894 his machine rode on 1,800 feet (550 m) of rails and was prevented from rising by outriggers underneath and wooden safety rails overhead, somewhat in the manner of a roller coaster. His apparent goal in building this machine was not to soar freely, but to test if it would lift off the ground. During its test run all of the outriggers were engaged, showing that it had developed enough lift to take off, but in so doing it damaged the track; the "flight" was aborted in time to prevent disaster. The craft was almost certainly aerodynamically unstable and uncontrollable, which Maxim probably realized, because he subsequently abandoned work on it.
Read more about this topic: Hiram Stevens Maxim
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