Kite
From Wikipedia, the free encyclopedia
A kite is a tethered aircraft.[1]
The necessary lift that makes the kite wing fly is generated when air flows
over and under the kite's wing, producing low pressure above the wing and high
pressure below it. This deflection 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 the one or more lines or tethers.[2]
The anchor point of the kite line may be static or moving (e.g., the towing of
a kite by a running person, boat, free-falling anchors as in paragliders and
fugitive parakites[3][4]
or vehicle).[5][6]
The same principles can be used in
water[7][8][9]
and experiments have also been made with lighter-than-air kites (kytoons)[10]
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. Power kites
are multi-line steerable kites designed to generate large forces which can be used to power
activities such as kite surfing, kite landboarding, kite fishing, kite buggying
and a new trend snow kiting. Kites towed behind boats can lift passengers[11]
which has had useful military applications in the past.[12]
History
It is generally accepted that kites
were first invented approximately 2800 years ago in China,[13][14]
where materials ideal for kite building were readily available: silk fabric for sail material; fine,
high-tensile-strength silk for flying line; and resilient bamboo
for a strong, lightweight framework.
The kite was said to be the
invention of the famous 5th-century BC Chinese philosophers Mozi and Lu Ban.
By at least 549 AD paper kites were being flown, as it was recorded in that year a
paper kite was used as a message for a rescue mission.[15]
Ancient and medieval Chinese sources list other uses of kites for measuring
distances, testing the wind, lifting men, signaling, and communication for
military operations.[15]
The earliest known Chinese kites were flat (not bowed) 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.[16][17][18]
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.[19]
Kites were known throughout Polynesia,
as far as New Zealand, with the assumption being that the knowledge diffused from
China along with the people.
Anthropomorphic kites made from cloth and wood were used in religious
ceremonies to send prayers to the gods.[20]
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.[21]
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, and kites were brought back by sailors from Japan and Malaysia in the
16th and 17th centuries.[22]
Although they were initially regarded as mere curiosities, by the 18th and 19th
centuries kites were being used as vehicles for scientific research.[22]
In 1750, Benjamin Franklin published a proposal for an experiment to prove that
lightning is electricity by flying a kite in a storm that appeared capable of
becoming a lightning storm. It is not known whether Franklin ever performed his
experiment,[23][24]
but on May 10, 1752, Thomas-François
Dalibard of France conducted a similar
experiment (using a 40-foot (12 m) iron rod instead of a kite) and extracted
electrical sparks from a cloud.[23]
Kites were also instrumental in the
research and development of the Wright brothers when building the first
airplane in the late 1800s. Over the next 70 years, many new kite designs were
developed, and often patented. These included Eddy's tail-less diamond kite, the tetrahedral kite, the
flexible kite, the sled kite, and the parafoil kite, which helped to develop
the modern hang-gliders.[25]
In fact, the period from 1860 to about 1910 became the "golden age of
kiting". Kites started to be used for scientific purposes, especially in
meteorology, aeronautics, wireless communications and photography; many different designs of man-lifting kite were developed as well as power kites.
The development of mechanically
powered airplane diminished interest in kites. World War II
saw a limited use of kites for military purposes (see Focke Achgelis Fa 330 for example) but since then they are used mainly for
recreation.
Materials
Designs often emulate flying
insects, birds, and other beasts, both real and mythical. The finest Chinese
kites are made from split bamboo (usually golden bamboo), covered with silk,
and hand painted. On larger kites, clever hinges and latches allow the kite to
be disassembled and compactly folded for storage or transport. Cheaper
mass-produced kites are often made from printed polyester
rather than silk.
Tails are used for some single-line
kite designs to keep the kite's nose
pointing into the wind. Spinners and spinsocks can be attached to the flying
line for visual effect. There are rotating wind socks which spin like a turbine.
On large display kites these tails, spinners and spinsocks can be 50 feet (15
m) long or more.
Modern acrobatic kites use two or
four lines to allow fine control of the kite's angle to the wind. Traction
kites may have an additional line to de-power the kite and quick-release
mechanisms to disengage flyer and kite in an emergency.
Practical
uses
Human
flight
Humans are sometimes bound to a
large kite to fly, as many hang gliders
are true kites. The first known example is Yuan Huangtou
in 550 CE.
Military
applications
Kites have been used for military
uses in the past for signaling, for delivery of munitions,
and for observation, by lifting an observer above the field of battle, and by
using kite aerial photography.
According to Samguk Sagi,
in 637, Kim Yu-sin, a Korean general of Silla rallied his troops to defeat rebels
by lofting a kite with a straw man
which looked like a burning ball flying to the sky.[26]
Russian chronicles mention prince Oleg of Novgorod use kites during the siege of Constantinople
in 906: "and he crafted horses and men of paper, armed and gilded, and
lifted them into the air over the city; the Greeks saw them and feared".
Kites were also used by Admiral Yi
of the Joseon Dynasty (1392-1910) of Korea. During the Japanese invasions of Korea (1592–1598), Admiral Yi commanded his navy with kites. His kites had
specific markings directing his fleet to perform his order.[27]
The war eventually resulted in a Korean victory; the kites played a minor role
in the war's conclusion.
In more modern times the British
Army used kites to haul human lookouts high into the air for observation
purposes, using the kites developed by Samuel Franklin Cody. Barrage kites were used to protect shipping during the
last Second World War.[28][29]
Kites were also used for anti-aircraft target practice.[30]
Kites and kytoons were used for lofting communications antenna.[31]
Submarines
lofted observers in rotary kites.[32]
The Rogallo parawing kite[33]
and the Jalbert parafoil kite were used for governable parachutes (free-flying
kites) to deliver troops and supplies.[34]
Science
and meteorology
Kites have been used for scientific
purposes, such as Benjamin Franklin's famous experiment proving that lightning
is electricity. Kites were the precursors to the traditional aircraft,
and were instrumental in the development of early flying craft. Alexander Graham Bell experimented with very large man-lifting kites, as did the Wright brothers
and Lawrence Hargrave. Kites had a historical role in lifting scientific
instruments to measure atmospheric conditions for weather forecasting.
Radio
aerials and light beacons
Kites can be used for radio
purposes, by kites carrying antennas for MF, LF or VLF-transmitters. This
method was used for the reception station of the first transatlantic
transmission by Marconi. Captive balloons may be more convenient for such experiments, because
kite-carried antennas require a lot of wind, which may be not always possible
with heavy equipment and a ground conductor. It must be taken into account
during experiments, that a conductor carried by a kite can lead to a high
voltage toward ground, which can endanger people and equipment, if suitable
precautions (grounding through resistors or a parallel resonant-circuit tuned
to transmission frequency) are not taken.
Kites can be used to carry light
effects such as lightsticks or battery powered lights.
Kite
traction
Kites can be used to pull people and
vehicles downwind. Efficient foil-type kites
such as power kites can also be used to sail upwind under the same principles
as used by other sailing craft, provided that lateral forces on the ground or
in the water are redirected as with the keels, center boards, wheels and ice
blades of traditional sailing craft. In the last two decades several kite
sailing sports have become popular, such as kite buggying, kite landboarding, kite boating
and kite surfing. Snow kiting has also become popular in recent years.
Kite sailing opens several
possibilities not available in traditional sailing:
- Wind speeds are greater at higher altitudes
- Kites may be manoeuvered dynamically which increases
the force available dramatically
- There is no need for mechanical structures to withstand
bending forces; vehicles or hulls can be very light or dispensed with all
together
Cultural
uses
Kite festivals are a popular form of
entertainment throughout the world. They include large local events,
traditional festivals which have been held for hundreds[clarification needed] of years
and major international festivals which bring in kite flyers from Britain to
display their unique art kites and demonstrate the latest technical kites.
Asia
Kite flying is popular in many Asian
countries, where it often takes the form of 'kite fighting',
in which participants try to snag each other's kites or cut other kites down.[35]
Fighter kites
are usually small, flat, flattened diamond-shaped kites made of paper and
bamboo. Tails are not used on fighter kites so that agility and maneuverability
are not compromised.
In Afghanistan,
kite flying is a popular game, and is known in Dari as Gudiparan Bazi. Some kite fighters pass their
strings through a mixture of ground glass powder and glue, which is legal. The
resulting strings are very abrasive and can sever the competitor's strings more
easily. The abrasive strings can also injure people. During the Taliban
rule in Afghanistan, kite flying was banned, among various other recreations.
In Pakistan,
kite flying is often known as Gudi-Bazi or Patang-bazi. Although kite flying is
a popular ritual for the celebration of spring festival known as Jashn-e-Baharaan (lit. Spring Festival) or Basant,
kites are flown throughout the year. Kite fighting
is a very popular all around Pakistan, but centered in urban centers across the
country especially Lahore. The kite fights are at their maximum during the spring
celebrations and the fighters enjoy competing with rivals in which one have to
cut-loose the string of the kite of other, this is popularly called as
"Paecha". During the spring festival, kite flying competitions are
held across the country and the skies are colored with kites. As people
cut-loose an opponents kites, shouts of 'wo kata' ring through the air.
Reclaiming the kites, after they have been cut-loose by running after them, is
a popular ritual especially among the youth (similar to scenes depicted in the
Kite Runner which is based in neighboring Afghanistan). Kites and strings are a
big business in the country and many types of strings are used: glass-coated
strings, metal strings and tandi. However, kite flying was recently banned in Punjab
due to recent motorcyclist deaths caused by glass-coated or metal kite-strings.
Kup, Patang, Guda, and Nakhlaoo are some of the kites used. They vary in
balance, weight and speed through the air.
In Vietnam,
kites are flown without tails. Instead small flutes are attached allowing the
wind to "hum" a musical tune. There are other forms of sound-making
kites. In Bali, large bows are attached to the front of the kites to make a
deep throbbing vibration, and in Malaysia row of gourds with sound-slots are
used to create a whistle as the kite flies.[36]
Kites are very popular in India,
with the states of Bihar, Jharkhand, Gujarat, West Bengal, Rajasthan and Punjab
notable for their kite fighting festivals. Highly maneuverable single-string
paper and bamboo kites are flown from the rooftops while using line friction in
an attempt to cut each other's kite lines, either by letting the cutting line
loose at high speed or by pulling the line in a fast and repeated manner.
During the Indian
spring festival of Makar Sankranti,
near the middle of January, millions of people fly kites all over northern
India. Kite flying in Hyderabad starts a month before this, but kite flying/fighting
is an important part of other celebrations, including Republic Day,
Independence Day, Raksha Bandhan, Viswakarma Puja day in late September and Janmashtami.
An international kite festival is held every year before Uttarayan
for three days in Vadodara, Surat and Ahmedabad.
Weifang, Shandong, China is the kite capital of the world. China is the oldest
place, probably with India where kites have been flown since antiquities. It is
home to the largest kite museum in the world, the thousands of kites here have
a display area of 8100 m2. Weifang hosts an annual
international kite festival on the large salt flats south of the city. There
are several kite museums in Japan, UK, Malaysia,
Indonesia, Taiwan, Thailand and the USA.
Europe
In Greece
and Cyprus,
flying kites is a tradition for Clean Monday,
the first day of Lent. In the British
Overseas Territory of Bermuda,
traditional Bermuda kites are made and flown at Easter,
to symbolise Christ's ascent. Bermuda kites hold the world records for altitude
and duration. In Fuerteventura a kite festival is usually held on the weekend nearest to 8
November lasting for 3 days.
South
America
In Colombia,
kites can be seen flown in parks and recreation areas during August which is
known to be windy. It is during this month that most people, especially the
young ones would fly kites.
In Guyana,
kites are flown at Easter, an activity in which all ethnic and religious groups
participate. Kites are generally not flown at any other time of year. Kites
start appearing in the sky in the weeks leading up to Easter and school
children are taken to parks for the activity. It all culminates in a massive
airborne celebration on Easter Monday especially in Georgetown, the capital,
and other coastal areas. The history of the practice is not entirely clear but
given that Easter is a Christian festival, it is said that kite flying is
symbolic of the Risen Lord. Moore[38]
describes the phenomenon in the 19th century as follows:
A very popular Creole pastime was
the flying of kites. Easter Monday, a public holiday, was the great kite-flying
day on the sea wall in Georgetown and on open lands in villages. Young and old
alike, male and female, appeared to be seized by kite-flying mania. Easter 1885
serves as a good example. “The appearance of the sky all over Georgetown, but
especially towards the Sea Wall, was very striking, the air being thick with
kites of all shapes and sizes, covered with gaily coloured paper, all riding
bravely on the strong wind"
(His quotation is from a letter to
The Creole newspaper of December 29, 1858). The exact origins of the practice
of kite flying (exclusively) at Easter are unclear. Brereton and Yelvington[39] speculate that kite flying was
introduced by Chinese indentured immigrants to the then colony of British
Guiana in the mid 19th century. The author of an article in the Guyana
Chronicle newspaper of May 6, 2007 is more certain:
Kite flying originated as a Chinese
tradition to mark the beginning of spring. However, because the plantation
owners were suspicious of the planter class (read "plantation
workers"), the Chinese claimed that it represented the resurrection of Jesus Christ. It was a
clever argument, as at that time, Christians celebrated Easter to the glory of
the risen Christ. The Chinese came to Guyana from 1853-1879.[40]
In Brazil,
flying a kite is almost a religion to many children from North to South of the
Country. For the Brazilian children, boys mainly, flying a kite is a big competition
and sometimes even young adults and adults become involved. In São Paulo,
for example, many children wake up early to fly their kites before and after
school time. The goal of the game for them is to cut their opponent's kite and
for this they use a special substance, which they make themselves and apply to
the string of their kites. This substance, called in Portuguese 'cortante' or cerol (pt) is very sharp and it is a mixture of glue and tiny pieces
of glass, mixed together. Although it is against the law to use 'cerol' most
children make and use it, causing serious and sometimes fatal accidents with
motobikers, ciclists, etc. Motobikes sometimes have an antenna to protect the
motobikers.[41]
Popular
culture
- The Kite Runner, a 2005 novel by Khaled Hosseini dramatizes the role of kite fighting in pre-war Kabul.
- The Peanuts cartoon character Charlie Brown was often depicted having flown his kite into a tree
as a metaphor for life's adversities.
General
safety issues
There are safety issues involved in
kite-flying, more so with power kites. Kite lines can strike and tangle on
electrical power lines, causing power blackouts and running the risk of
electrocuting the kite flier. Wet kite lines or wire can act as a conductor for
static electricity and lightning when the weather is stormy. Kites with large
surface area or powerful lift can lift kite fliers off the ground or drag them
into other objects. In urban areas there is usually a ceiling on how high a
kite can be flown, to prevent the kite and line infringing on the airspace of
helicopters and light aircraft.
The entire article, including images and references, can be
found at:
https://en.wikipedia.org/wiki/Kite
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