Wednesday, 30 November 2011

Physics of Archery and Olympic Archery Tickets

When a projectile is thrown by hand, the speed of the projectile is determined by the kinetic energy imparted by the thrower's muscles performing work. However, the energy must be imparted over a limited distance and therefore over a limited time, so the limiting factor is not work but rather power, which determined how much energy can be added in the limited time available. Power generated by muscles, however, is limited by Force velocity relationship, and even at the optimal contraction speed for power production, total work done by the muscle will be less than half of what could be done if the muscle were contracting over the same distance at very slow speeds, resulting in less than 1/4 the projectile launch velocity possible without the limitations of the Force-velocity relationship.
When a bow is used, the muscles are able to perform work much more slowly, resulting in greater force and greater work done. This work is stored in the bow as elastic potential energy, and when the bowstring is released, this stored energy is imparted to the arrow much more quickly than can be delivered by the muscles, resulting in much higher velocity and, hence, greater distance. This same process is employed by frogs which use elastic tendons to increase jumping distance. In archery, some energy is dissipated through elastic hysteresis, reducing the overall amount released when the bow is shot. Of the energy remaining, some is dampened both by the limbs of the bow and the bowstring. Depending on the elasticity of the arrow, some of the energy is also absorbed by compressing the arrow, primarily because the release of the bowstring is rarely in line with the arrow shaft, causing it to flex out to one side.
This is because the bowstring accelerates faster than the archer's fingers can open, and consequently some sideways motion is imparted to the string, and hence arrow nock, as the power and speed of the bow pulls the string off the opening fingers. Even with a release aid mechanism some of this effect will usually be experienced, since the string always accelerates faster than the retaining part of the mechanism. This results in an in-flight oscillation of the arrow in which its center flexes out to one side and then the other repeatedly, gradually reducing as the arrow's flight proceeds; this can be clearly seen in high-speed photography of an arrow at discharge.
Modern arrows are made to a specified 'spine', or stiffness rating, to maintain matched flexing and hence accuracy of aim. This flexing can be a desirable feature, since, when the spine of the shaft is matched to the acceleration of the bow (string), the arrow bends or flexes around the bow and any arrow-rest, and consequently the arrow, and fletching, have an un-impeded flight. This feature is known as the archer's paradox. It maintains accuracy, for if part of the arrow struck a glancing blow on discharge, some inconsistency would be present, and the excellent accuracy of modern equipment would not be achieved.
The accurate flight of an arrow is dependent on its fletching. The arrow's manufacturer can arrange fletching to cause the arrow to rotate along its axis. This improves accuracy by evening pressure buildups that would otherwise cause the arrow to "plane" on the air in a random direction after shooting. Even though the arrow is made with extreme care, the slightest imperfection, or air movement, will cause some unbalanced turbulence in air flow. Consequently, rotation creates an equaling of such turbulence, which, overall, maintains the intended direction of flight i.e. accuracy. This rotation is not to be confused with the rapid gyroscopic rotation of a rifle bullet. If the fletching is not arranged to induce rotation, it will still improve accuracy by causing a restoring drag any time the arrow tilts away from its intended direction of travel.
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Thursday, 24 November 2011

Archery Venue and Olympic Archery Tickets

Lord's Cricket Ground is a cricket venue in St John's Wood, London. Named after its founder, Thomas Lord, it is owned by Marylebone Cricket Club (MCC) and is the home of Middlesex County Cricket Club, the England and Wales Cricket Board (ECB), the European Cricket Council (ECC) and, until August 2005, the International Cricket Council (ICC). Lord's is widely referred to as the home of cricket and is home to the world's oldest sporting museum.
Lord's today is not on its original site, being the third of three grounds that Lord established between 1787 and 1814. His first ground, now referred to as Lord's Old Ground, was where Dorset Square now stands. His second ground, Lord's Middle Ground, was used from 1811 to 1813 before being abandoned to make way for the construction through its outfield of the Regent's Canal. The present Lord's ground is about 230 meters north-west of the site of the Middle Ground. A major redevelopment has been proposed for Lord's which would increase capacity by another 10,000 as well as adding apartments and an ice rink. The earliest known match played on the current Lord's Cricket Ground was Marylebone Cricket Club v Hertfordshire on 22 June 1814. The oldest cricket fixture at Lord's is the annual Eton v Harrow match, which was first played on the Old Ground in 1805, and on the present Lord's Cricket Ground in July 1818.
A baseball game was held at Lord's during the Great War to raise funds for the Canadian Widows and Orphans Fund. A Canadian team played an American team in a match watched by 10,000 people. Bowls, tennis, archery and several other sports have been played at Lord's in the past, but never rugby or football. Lord's is also one of the planned venues for the 2012 Summer Olympics. The archery competition will take place in front of the Pavilion, with the archers positioned in front of the Allen Stand and the targets placed in front of the Grand Stand.
Olympic Archery is driven from the old historical archery. Watch this historical sport live in the London during Olympic Games 2012. London is the host city of Olympic 2012. Buy OlympicArchery Tickets and enjoy its all events live. You can purchase Olympic Archery Tickets from Global Ticket Market. Global Ticket Market is selling all types of Olympic Tickets. It is very easy and secure to purchase Olympic Archery Tickets or any other Olympic Tickets from Global Ticket market. Global Ticket Market offers you Olympic Archery Tickets at very favorable rates.  

Saturday, 19 November 2011

Viktor Ruban and Archery Tickets

Viktor Ruban was born on 24 May 1981 in Soviet Union. Ruban is an athlete from Ukraine, who competes in archery.
Ruban competed at the 2004 Summer Olympics in men's individual archery. He won his first match, advancing to the round of 32; he also won his second match, advancing to the round of 16. In the third match, he lost to Laurence Godfrey of Great Britain. Ruban placed 13th overall. Ruban was also a member of the bronze medal Ukrainian men's archery team at the 2004 Summer Olympics.
At the 2008 Summer Olympics in Beijing Ruban finished his ranking round with a total of 678 points, just one point behind Juan Rene Serrano and equal with Mangal Singh Champia. This gave him the third seed for the final competition bracket in which he faced Maged Youssef in the first round, beating the Egyptian111-96. In the second round Ruban was too strong for Michael Naray 115-105 and via Jacek Proc 114-108 in the third round he advanced to the quarter finals. There he had no problem beating Moriya Ryuichi 115-106. In the semi final he and his opponent Bair Badenov both came to 112 points and an extra round was needed. Here Ruban scored 20 points and Badenov 18, which brought Ruban into the final. In the final he claimed the gold by beating Park Kyung-Mo by 113-112.
Together with Markiyan Ivashko and Oleksandr Serdyuk he also took part in the team event. With the highest score from the ranking round combined with the 676 of Serdyuk and the 658 of Ivashko Ukraine were in second position after the ranking round, which gave them a straight seed into the quarter finals. With 214-211 they were too strong for the Chinese Taipei team, but in the semi final they were eliminated by Italy 223-221. In the challenge for the bronze medal China was too strong with 222-219.
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Monday, 14 November 2011

Bow Hunting and Archery Tickets

Bow hunting is the practice of killing game animals by archery. It has been a normal use of archery in every culture that had bows.
 In contrast to a rifle hunter, who may shoot effectively from ranges in excess of 550 m; archers usually restrict shots to 2.1 m to 38 m. The distance depends upon individual ability, the target animal, the bow strength, terrain, arrow and weather. Most bows used for hunting have a draw weight of 50 pounds force or more. This is enough to hunt all but the very largest game. Arrows with mass more than 900 grains penetrate better in large animals so might be the bow hunter's choice when hunting these animals.
Arrows, bows and sights are commonly of the more modern varieties. However, all effective variations, including crossbows and wooden bows launching wooden arrows with stone points, are used. The bow hunter may walk along the ground slowly, looking for game and stalking it carefully in the final approach. Hunters often wear camouflage clothing and walk upwind. In "still hunting" the hunter waits for game to come to him, usually near food, water, or known trails. Brush and other natural materials may be placed for cover, or a "ground blind" that looks like a tent. The hunter may wait on a wooden or metal stand elevated in a tree, from three to six meters. Bow hunting for fish is called bow fishing. Bow fishing equipment usually adds a line attached to a spool or a reel as well as a specially designed, heavier arrow. The sights are different to allow for refraction.
Hunting with a bow is a historical sport. Archery is being used in since old history. You can enjoy Archery live in London Olympic 2012. Buy Archery Tickets and enjoy it live. Just access Global Ticket Market and purchase any kind of Olympic Tickets at inexpensive rates. Archery Tickets are also available at Global Ticket Market. Purchase Archery Tickets and watch this historical sport live in London.

Thursday, 10 November 2011

Longbow and Archery Tickets

A longbow is a type of bow that is tall roughly equal to the height of the person who uses it; this will allow its user a fairly long draw, at least to the jaw. A longbow is not significantly reserved. Its limbs are relatively narrow so that they are circular or D-shaped in cross section. Flat bows can be just as long; the difference is that, in cross-section, a flat bow has limbs that are approximately rectangular.
The longbow is based on the late medieval English longbow in use during the 12th to 16th centuries. The historical longbow was a self bow, often made from yew. Modern longbows may also be made from modern materials.
Because the longbow can be made from a single piece of wood, it can be crafted relatively easily and quickly. Amateur bowyers today can craft a longbow in about ten to twenty hours, while highly skilled bowyers, such as those who produced medieval English longbows, can craft wooden longbows in just a few hours.
One of the simpler longbow designs is known as the self bow. By definition, a self bow is made from a single piece of wood. Truly traditional English longbows are self bows, made from yew wood. The bow stave is cut from the radius of the tree so that the sapwood becomes the back two thirds and the belly, the remaining one third, is heartwood. Yew sapwood is good only in tension, while the heartwood is good in compression. However, one must make compromises when making a yew longbow, as it is difficult to find perfect unblemished yew. The demand for yew bow staves was such that by the late 16th century, mature yew trees were almost extinct in northern Europe. In other desirable woods such as Osage orange and mulberry the sapwood is almost useless and is normally removed entirely.
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Friday, 4 November 2011

Mongol's Archery and Archery Tickets

The Old Mongols have their own technique for shooting, known as the "Mongolian release." The Mongols, if right-handed, keep their bow in the left hand, pushes it forward as the right arm pulls the string all the way back to behind the ear. The left arm is now fully extended, and the release is near. However, now comes an interesting part. Since this bow has immense power, the Mongols have to use a special technique to hold the string during the drawing of the bow and before the arrow is released. The technique is as follows: The string is held by the thumb, since this is the strongest finger. Still, it is not easy to hold 166 pounds comfortably. Thus, the thumb is supported with the index finger curling around, placed atop the outermost joint, exactly at the base of the nail. The other fingers are also curled, forming a fist. Even so, this is not enough. Hence, the Mongols use a special ring on which the string is hooked before release. This thumb ring, a cylinder that fits around the outer part of the thumb and protects its pad from damage as the string is released, is typically made from Chinese jade or agate, but leather, metal and bone is also known to have been used.
Mongolian soldiers used to shoot while sitting on horseback, and with deadly accuracy. This was done by skillfully timing the shots to the moment when the hooves of the horse were in mid-air, so as to avoid disturbing the aim when they hit the ground. When we are talking about Mongolian bows, the first thoughts go the military use, although hunting and target practice certainly were more prominent activities. Every day was not filled with war, but hunting and the training of various skills were part of the daily routine. However, we will start with the military aspect.
In the military, each soldier carried two bows on horseback. One bow was for long-range shooting, another for shooting at close distances. Also, each soldier had two quivers with arrows for different purposes. To mention but a few of these, there were armor-piercing arrows with a particularly heavy arrowhead of tempered steel, there were incendiary arrows for setting buildings afire and spreading fear in the enemy ranks, as well as whistling arrows for signaling. Of course, the majority of arrows they carried were ordinary arrows where the arrowhead and length of the shaft were adjusted to the normal range at which the particular type arrow was to be used. The standard, according to James Chambers, was that each soldier should have at least sixty arrows with him or her. Yes; it merits mention once more that the strongest and most courageous Mongolian females rode along with the men and fought bravely. Also, the women who did not ordinarily participate in military activity nevertheless had to learn how to wield the bow, a necessary skill for self-defense as well as hunting.
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Wednesday, 2 November 2011

Horse Archery

A horse archer, horsed archer, or mounted archer is a cavalryman armed with a bow, able to shoot while riding from horseback. Archery has occasionally been used from the backs of other riding animals. Mounted archery was a defining characteristic of Steppe warfare throughout Central Asia, and throughout the prairies of America after the adoption of the horse, used by peoples including theScythians, Sarmatians, Parthians, Sassanids, Huns, Byzantines, Bulgars, Cumans, Kipchaks, Magyars, Japanese, Mongols, Turks,Russians, Rajputs, Comanches, and others. It was also adopted by other peoples and armies, notably Chinese and Romans who both suffered serious conflict with peoples practicing horse archery. It developed separately among the peoples of the South American pampas and the North American prairies; the Comanches were especially skilled
In battle, light horse archers were typically skirmishers; lightly armed missile troops capable of moving swiftly to avoid close combat or to deliver a rapid blow to the flanks or rear of the foe. In the tactic of the Parthian shot the rider would retreat from the enemy while turning his upper body and shooting backwards. Due to the superior speed of mounted archers, troops under attack from horse archers were unable to respond to the threat if they did not have ranged weapons of their own. Constant harassment would result in casualties, morale drop and disruption of the formation. Any attempts to charge the archers would also slow the entire army down.
An example comes from an attack on Comanche horse archers by Texas Rangers who were saved by their muzzle loading firearms and by a convenient terrain feature. Captain John Bird rode up the Little River with fifty Rangers. They met some twenty Comanches hunting buffalo, and attacked them. The Comanches fled, easily keeping clear of the Rangers, for several miles across the open prairie before Bird noticed that he was now chasing some two hundred Indians. He immediately retreated, only to discover his classic error in fighting mounted archers. The Comanches pursued in turn, screaming and loosing what seemed like clouds of arrows. Bird's command happened across a ravine where they could shoot from cover. They fired carefully to keep the Indians at long range, always making sure they kept a few of their rifles loaded in case of an assault. The horse archers did not charge, but kept the Rangers under siege until seven of them, including Captain Bird, were dead or dying. The Rangers retreated to the east and claimed victory. Comanches set out on large-scale raids, destroying and torturing over a wide area.
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