The RPA actually got its start as early as 1896, when something called aerodromes at the time, were used to test the capabilities of new flying devices and to test if it was even possible for a heavier-than-air craft to achieve sustained flight. In May 1896, Dr. Samuel Langley proved that mechanical flight was possible with his Aerodrome No. 5.
From that point on, the shape, design and technology structure of the unmanned aircraft evolved over the years, improving each time.