For Quadrocopter there are many names. They are also called Quadrotor, Quadricopter, Microcopter, Multicopter or simply 'UFO'. This type of model construction is very young. It began early in the new millennium with commercial products for flying camera inspections. This book explains the working principle, the used motors, sensors and control systems.Contents: Functionality - Base components -Extension components - Flight mechanics - Settingthe controller - Dimensioning of motors andpropellers - Special shapes, Tri-, Hexa-, Octocopters -Initial operation, sources of error and first flight -