UCAV

An unmanned combat aerial vehicle (UCAV), also known as a combat drone or simply a drone, is an unmanned aerial vehicle (UAV) that usually carries aircraft ordnance such as missiles. Aircraft of this type have no onboard human pilot. These drones are usually under real-time human control, with varying levels of autonomy. They are used in drone strikes.

Equipment necessary for a human pilot (such as the cockpit, armor, ejection seat, flight controls, and environmental controls for pressure and oxygen) are not needed, as the operator runs the vehicle from a remote terminal, resulting in a lower weight and a smaller size than a manned aircraft.

While several nations possess and manufacture unarmed UAV, only the United States, Israel, Italy, China, India, Pakistan and Turkey are at present known to have manufactured operational UCAV as of December 2015.

One of the earliest explorations of the concept of the combat drone was by Lee De Forest, an early inventor of radio devices, and U. A. Sanabria, a TV engineer. They presented their idea in an article in a 1940 publication of Popular Mechanics. The modern military drone as known today was the brainchild of John Stuart Foster Jr., a nuclear physicist and former head of the Lawrence Livermore National Laboratory (then called the Lawrence Radiation Laboratory). In 1971, Foster was a model airplane hobbyist and had the idea this hobby could be applied to building weapons. He drew up plans and by 1973 DARPA (Defense Advanced Research Projects Agency) built two prototypes called "Praeire" and "Calere". They were powered by a modified lawn-mower engine and could stay aloft for two hours while carrying 28-pounds of load.

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