The quadcopter design had never really caught on the mainstreams aircraft design due to its stability issues; however, quadcopters have recently becomes very popular because of radio controlled (RC) aircraft, and in other particular drones. It uses an electronic control system and electronic sensors to help stabilize itself.
1.1 Background problems
Quadcopter is an important aspect of any type of UAV's. Quadcopter is a latest design of UAV's. The early use of UAV's was in military. The first attack with UAV's was in 1849 when Australia attacks on Venice with Unmanned Balloons which loaded with explosives. While some balloons were reach their targets, most are blown back to Australians lines because of change wind. The birth of US UAV's has begun in 1959 when US Air Force losing their pilots over hostile territory. Over the last few years we have seen a massive growth in the manufacture and sales of remote control airborne vehicles.
1.2 What is