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The Piasecki X-49 "SpeedHawk" is an American four-bladed, twin-engined experimental high-speed compound helicopter developed by Piasecki Aircraft.The X-49A is based on the airframe of a Sikorsky YSH-60F Seahawk, but utilizes Piasecki's proprietary vectored thrust ducted propeller (VTDP) design and includes the addition of lifting wings.
The first Z-9 flew in 1981, and was built in China from components supplied by Aérospatiale as part of a production patent bought on 15 October 1980. [2] On 16 January 1992, the indigenous variant Z-9B, constructed with 70% Chinese-made parts, flew successfully. The flight test was completed in November 1992 and the design was finalized a ...
Using letter copying presses, copies could be made up to twenty-four hours after a letter was written, though copies made within a few hours were best. A copying clerk would begin by counting the number of master letters to be written during the next few hours and by preparing the copying book. Suppose the clerk wanted to copy 20 one-page letters.
The Harbin Z-19 is a Chinese light reconnaissance/attack helicopter developed by Harbin Aircraft Manufacturing Corporation (HAMC) for the People's Liberation Army Air Force and the Ground Force Army Aviation. [3] It is a specialized combat variant of the Harbin Z-9, which is a license-built version of the Eurocopter Dauphin. [4]
Harbin Z-9 - medium-weight multipurpose twin-engine helicopter - Chinese variant of the Eurocopter Dauphin. Harbin Z-9W/G - attack helicopter; Harbin Z-19 - reconnaissance and attack helicopter; Harbin Z-20 - a new 10-ton utility helicopter for the PLA Air Force, army and navy. Similar specifications to Sikorsky UH-60 Black Hawk. Harbin Z-21
The CH-1A was the first helicopter to land on Pikes Peak, at an altitude of 14,110 feet (4,300 m) on 15 September 1955, [2] it had a higher cruise speed than comparable machines, and a CH-1B, modified with an FSO-526-2X engine, set an official FAI world altitude record for helicopters of 29,777 feet [note 1] on December 28, 1957, while being ...
The illustrated encyclopedia of helicopters. New York: Bonanza Books. ISBN 0-517-43935-2. Best, Martin S. (September 2014). "A History of the Fairchild Hiller FH-1100 Helicopter: Part 2: Development and Operation of the FH-1100". Air-Britain Archive. pp. 107– 122. ISSN 0262-4923. Donald, David (1998). The complete encyclopedia of world ...
This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of VTOL (Vertical TakeOff and Landing) aircraft cannot perform. High-hypersonic –