For quadcopters there are many names. They are also called quadrocopter,
quadricopter, drone, 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. One sees quadcopters
in all sizes and price ranges on the market. They start with the toy
quadcopters, which are small and, despite their low price, often
surprisingly robust. In this model division, a similar trend can be
observed as with helicopter and airplane models. The smaller and cheaper
systems are often built as 'ready to fly', while larger systems are
often available as kits. Contents: - Functionality - Ready to fly
quadcopters - Components - GPS, photo and film flight - Flight
mechanics - Setting the controller - Dimensioning of motors and
propellers - Special shapes, tri-, hexa- and octocopters - Initial
operation, sources of errors and flight