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De Lackner HZ-1 Aerocycle
The HZ-1 Aerocycle, also known as the YHO-2 and by the manufacturer's designation DH-4 Heli-Vector, was an American one-man "personal helicopter" developed by de Lackner Helicopters in the mid-1950s. Intended to be operated by inexperienced pilots with a minimum of 20 minutes of instruction,〔("Aerocycle Lifts Soldier" ) ''Popular Mechanics'', April 1956, p. 88〕 the HZ-1 was expected to become a standard reconnaissance machine with the United States Army. Although early testing showed that the craft had promise for providing mobility on the atomic battlefield, more extensive evaluation proved that the aircraft was in fact too difficult to control for operation by untrained infantrymen, and after a pair of crashes the project was abandoned. A single model of the craft was put on display.
== Design and development ==
During the early 1950s, Charles H. Zimmerman of the National Advisory Committee for Aeronautics (NACA) developed a system for control of a rotorcraft in which, with the rotors mounted on the underside of the aircraft, the machine could be steered by the pilot through the simple shifting of his weight,〔 and kept stable through the actions of his natural reflexes.〔 Known as kinesthetic control, and similar in principle to the mechanics of riding a bicycle or a surfboard,〔Hiller Aviation Museum〕 it was hoped that the concept would allow for pilots to operate an aircraft with little to no training time.〔 NACA testing proved that the idea had merit, and several companies, including Bensen Aircraft, Hiller Aircraft, and de Lackner Helicopters, began development of rotorcraft using the concept.〔
The concept proposed by de Lackner Helicopters was a one-man flying platform, and it received the company designation "DH-4". The DH-4 was expected to be able to carry up to of cargo〔Goebel 2011〕 or an auxiliary fuel tank to extend its range up to 〔''Mechanix Illustrated'' 1955〕 in addition to its pilot; in addition, a cargo lifting line could be threaded through the rotor shaft for the carrying of slung loads underneath the craft.〔
The machine was a simple, cross-shaped frame, with the pilot standing on a platform, secured by a safety harness. The harness also secured the aircraft's engine, which was an outboard motor manufactured by Mercury Marine.〔 The engine was controlled by a twist-grip motorcycle-style throttle〔 and transferred power to the diameter, contra-rotating rotors via belt drive〔 with a chain reduction unit.〔Champlin 1953〕 The aircraft's landing gear consisted of airbags at the end of each arm of the frame along with a large rubber float in the middle, allowing for amphibious capability,〔 although this arrangement was later replaced by a pair of conventional helicopter-type skids.〔Harding 1997, p. 112.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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