Purpose This study seeks to present the initial requirements for medium altitude long endurance (MALE) UAV design of an increased reliability. Design/methodology/approach Shows and describes the successive design phases of PW‐103 MALE UAV. Findings The analysis of the performances of the PW‐103 UAV, powered by either a main or an auxiliary engine, demonstrated that auxiliary power unit improved flight safety significantly. Originality/value Successive MALE UAV configurations developed in the design process were aerodynamically more efficient than their predecessors.
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Goetzendorf‐Grabowski et al. (2006) studied this question.