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SNECMA Atar Volant
The original Atar Volant or C.400 P1 was a turbojet engine produced by SNECMA (Société National d'Etude et de Construction de Moteurs d'Aviation) engineers, as part of their 'Atar' series.
Encased in a basic fairing which could hold fuel and remote-control equipment, the unit weighed 5,600 pounds (2550 kg) and generated a thrust of approximately 6,200 pounds-force (27.6 kN); the Atar Volant was able to cause vertical lift, which was precisely its purpose. There were later Atar Volant models, each made improvements and alterations to the previous designs, and eventually resulted in a full-fledged craft.
== Background and purpose ==
The Coléoptère was a VTOL or "Vertical Take-Off and Landing" aircraft that was designed by SNECMA during the 1950s. While the Coléoptère was not the first VTOL aircraft, none of its predecessors had an annular wing designed to land vertically. The benefit of this annular wing was the requirement for very little landing or take-off space. However, the design of the Coléoptère met with many problems, such as overcoming the torque imparted to a vertical engine by its own turbine wheels and rotating compressor, and discovering and developing a method of balancing the craft on the column of air released from its jet pipe during the take-off and landing phase, as well as, more particularly, during manoeuvres out of the vertical positioning. To address some of these problems, as well as to provide a way to achieve vertical lift, SNECMA set to work on what was to become the first model of the Atar Volants.
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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