Muscle Power
Leonardo planned to use muscle power to revolve the rotor, although such power would never have been sufficient to operate a gas rc helicopters successfully. His notes implied that his models flew, but from his sketch, there was no way to deal with the torque created by the propeller. Although he had undoubtedly identified the concept of a rotary-wing aircraft, the technology needed to create a rc helicopter simulation had not yet been produced. His drawings date to 1483, but they were first published nearly three centuries later.
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