One of the major tasks in the process of designing future unmanned aerial vehicles is the appropriate choice of a propulsion system and a power source. Depending on the role and size of a given UAV, the following engines are used: electric, jet, turbine and piston (combustion). The following paper also analyses the faultiness of UAVs. Moreover, the most appropriate propulsion systems and power sources depending on the type and description of the mission performed by a UAV are recommended.

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A system to support maintenance, approached with respect to particular maintenance actions. The modelling of a smart system to support maintenance of multi-role aircraft. Diagnostic- properties determining accomplishment of an air operation. A standard maintenance cycle. A maintenance programme targeted at the multi-role aircraft fleet.

Combat missions of both a single multi-role aircraft and a group of aircraft. Scenarios of air operations. Probabilistic models of air-to-air and air-to-surface operations (AAO and ASO, respectively). Probability that air combat missions of the AA and AS types prove successful.

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