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The De Lackner HZ-1 Aerocycle
The HZ-1 Aerocycle, also called the 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, the HZ-1 was expected to become a standard reconnaissance machine with the United States Army. It could be steered by the pilot through the simple shifting of his weight, and kept stable through the actions of natural reflexes....
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