A kite is traditionally a tethered heavier-than-air craft with wing surfaces that react against the air to create lift and drag. A kite consists of wings, tethers, pulleys, and anchors, Kites often have a bridle to guide the face of the kite at the correct angle so the wind can lift it. A kites wing also may be so designed so a bridle is not needed, when kiting a sailplane for launch, a kite may have fixed or moving anchors. Untraditionally in technical kiting, a kite consists of tether-set-coupled wing sets, even in technical kiting, though, the lift that sustains the kite in flight is generated when air moves around the kites surface, producing low pressure above and high pressure below the wings. The interaction with the wind also generates horizontal drag along the direction of the wind, the resultant force vector from the lift and drag force components is opposed by the tension of one or more of the lines or tethers to which the kite is attached. The anchor point of the line may be static or moving. The same principles of fluid flow apply in liquids and kites are used under water. A hybrid tethered craft comprising both a lighter-than-air balloon as well as a lifting surface is called a kytoon. Kites have a long and varied history and many different types are flown individually, Kites may be flown for recreation, art or other practical uses. Sport kites can be flown in aerial ballet, sometimes as part of a competition, even Man-lifting kites have been made. The kite has been claimed as the invention of the 5th-century BC Chinese philosophers Mozi, by 549 AD paper kites were certainly being flown, as it was recorded that in that year a paper kite was used as a message for a rescue mission. Ancient and medieval Chinese sources describe kites being used for measuring distances, testing the wind, lifting men, signaling, the earliest known Chinese kites were flat and often rectangular. Later, tailless kites incorporated a stabilizing bowline, Kites were decorated with mythological motifs and legendary figures, some were fitted with strings and whistles to make musical sounds while flying. From China, kites were introduced to Cambodia, Thailand, India, Japan, Korea, after its introduction into India, the kite further evolved into the fighter kite, known as the patang in India, where thousands are flown every year on festivals such as Makar Sankranti. Kites were known throughout Polynesia, as far as New Zealand, anthropomorphic kites made from cloth and wood were used in religious ceremonies to send prayers to the gods. Polynesian kite traditions are used by anthropologists get an idea of early primitive Asian traditions that are believed to have at one time existed in Asia, Kites were late to arrive in Europe, although windsock-like banners were known and used by the Romans. Stories of kites were first brought to Europe by Marco Polo towards the end of the 13th century, although they were initially regarded as mere curiosities, by the 18th and 19th centuries kites were being used as vehicles for scientific research. In 1750 Benjamin Franklin published a proposal for an experiment to prove that lightning was caused by electricity by flying a kite in a storm that appeared capable of becoming a lightning storm
Some kites flying in the park.
Star-shaped kite above a meadow south of Hockenheim