Uncrewed Aerial Systems (UAS) are more popularly known as drones, whether they are helicopters, quadcopters or small fixed wing aircraft. Strictly speaking, UAS is the entire system that supports the aircraft. That system includes the aircraft, the ground control station, communications systems, information analysis, maintenance, logistics and other support facilities.

However, the term drone is usually restricted to small systems used by Navy and Army rather than the larger systems coming into service with the Air Force. A Remotely Piloted Aircraft (RPA) is an actual large aircraft, flown by qualified pilots from a ground control station.

In Australian Defence Force (ADF) service, uncrewed aircraft range from the tiny PD-100 Black Hornet Nano helicopter which weighs only 18 grams and is carried by a soldier, being likened to a flying pair of binoculars, to the Air Force’s future RPA MQ-4 Triton UAS which has a wingspan of 39.9 metres, weighs 14,628 kg and an endurance…

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Source: asiapacificdefencereporter.com