A survey of small unmanned aircraft is presented with the objective of extending classic conceptual aircraft sizing techniques to the type informed by real performance and weight trends. The study utilizes composite design metrics adaptable to available literature published on small aircraft of multiple configurations and propulsion architectures. Design efficiency is quantified without the need for detailed data descriptions of aircraft, and an abbreviated sizing study of a small VTOL UAS concept is performed to demonstrate application of the metrics to technology assessment activities and aircraft requirements development.
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