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• Rotary-Wing Unmanned Aerial Vehicles

  88-98

  László Békési

  Bertold Békési

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  124

  The weight of these flying devices ranges from some dekagrams to ten tons. They can be used even in cases when the mission is too dangerous to risk the life of human beings, so the main field of their application is the military aviation (reconnaissance, observati on, and even armed att ack). The practical solutions of their airframe structure are more colourful than that of the traditional manned aircraft airframe structures. It is understandable considering that even extraordinary soluti ons can be tried with relati vely small financial risk. The airframes of Unmanned Aerial Vehicles are smaller and their designers are not so keen for conventional solutions. By their airframe structure, three diff erent categories can be separated: fi xed wing, rotary wing and hybrid. By the takeoff and landing solutions, also there are three categories: Horizontal Take Off and Landing – HTOL), Vertical Take Off and Landing – VTOL) and their combination. The objective of this paper is to introduce the performance of VTOL types and to present their possible applicability as well as their limitations.