Unmanned aerial vehicles (UAVs) that are often armed are referred to as unmanned combat aerial vehicles (UCAVs), sometimes known as combat drones or drones. These types of aircraft lack an onboard human pilot. Typically, drones are controlled by humans in real-time, with "the human's participation in UCAV system depending to levels of Unmanned Combat Aerial Vehicle (UCAV) autonomy and data communication requirement[s]" As the vehicle is operated from a remote terminal, it does not require the cockpit, armour, ejection seat, flying controls, or environmental controls for pressure and oxygen. As a result, it is smaller and lighter than manned aircraft. Typical unmanned aerial vehicles (UAVs) with a single propeller motor are slower and less nimble than manned high performance aircraft.
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