Development of an expendable turbojet engine for the propulsion of an unmanned aerial vehicle

This paper presents preliminary engineering methodology for the design of expendable turbojets in the range of 400 daN thrust. This class of engines are among biggest used for missiles, typical applications are Harpoon or Storm Shadow missiles and variety of target drones. The term "expendable" dictates different philosophy in design: simple, reliable and cheap are higher demands than performances. The objective was to analyze concepts of design and development employed in existing engines and according to this to present methodology of design followed with numerical example. Moreover, the aim was to show how to transform design in real construction of such engine followed with engineering considerations and logic conclusions.The main contribution of this work is that defines and explains steps required to design expendable turbojet engine, combining scientific and engineering approaches.