Category: Most famous

Mechanics of diving 

Tomb of the DiverPaestumItaly, a Greek fresco dated 470 BC

At the moment of take-off, two critical aspects of the dive are determined, and cannot subsequently be altered during the execution. One is the trajectory of the dive, and the other is the magnitude of the angular momentum.

The speed of rotation – and therefore the total amount of rotation – may be varied from moment to moment by changing the shape of the body, in accordance with the law of conservation of angular momentum.

The center of mass of the diver follows a parabolic path in free-fall under the influence of gravity (ignoring the effects of air resistance, which are negligible at the speeds involved)

Plunging

Although diving has been a popular pastime across the world since ancient times, the first modern diving competitions were held in England in the 1880s. The exact origins of the sport are unclear, though it likely derives from the act of diving at the start of swimming races.[2][3] The 1904 book Swimming by Ralph Thomas notes English reports of plunging records dating back to at least 1865.[4] The 1877 edition to British Rural Sports by John Henry Walsh makes note of a “Mr. Young” plunging 56 feet in 1870, and also states that 25 years prior, a swimmer named Drake could cover 53 feet.[5]

The English Amateur Swimming Association (at the time called the Swimming Association of Great Britain) first started a “plunging championship” in 1883.[6][7] The Plunging Championship was discontinued in 1937.

Fancy diving

Diving into a body of water had also been a method used by gymnasts in Germany and Sweden since the early 19th century. The soft landing allowed for more elaborate gymnastic feats in midair as the jump could be made from a greater height. This tradition evolved into ‘fancy diving’, while diving as a preliminary to swimming became known as ‘Plain diving’.

In England, the practice of high diving – diving from a great height – gained popularity; the first diving stages were erected at the Highgate Ponds at a height of 15 feet in 1893 and the first world championship event, the National Graceful Diving Competition, was held there by the Royal Life Saving Society in 1895. The event consisted of standing and running dives from either 15 or 30 feet.

It was at this event that the Swedish tradition of fancy diving was introduced to the sport by the athletes Otto Hagborg and C F Mauritzi. They demonstrated their acrobatic techniques from the 10m diving board at Highgate Pond and stimulated the establishment of the Amateur Diving Association in 1901, the first organization devoted to diving in the world (later amalgamated with the Amateur Swimming Association). Fancy diving was formally introduced into the championship in 1903.[8][9]

Olympic era

Swedish high diver Arvid Spångberg at the 1908 Olympic Games from the fourth Olympiad.

Plain diving was first introduced into the Olympics at the 1904 event. The 1908 Olympics in London added ‘fancy diving’ and introduced elastic boards rather than fixed platforms. Women were first allowed to participate in the diving events for the 1912 Olympics in Stockholm.[8]

In the 1928 Olympics, ‘plain’ and ‘fancy’ diving was amalgamated into one event – ‘Highboard Diving’. The diving event was first held indoors in the Empire Pool for the 1934 British Empire Games and 1948 Summer Olympics in London.

Springboard Diving

  • Six dives should be completed by men, five by women
  • Dives can be performed of any difficulty level
  • One dive during the contest must come from each of five different categories (forward, back, reverse, inward, twisting)
  • Men may repeat one of the categories for their sixth dive, women may not
  • Each dive must be different, meaning no dive can be repeated

Platform diving & Synchronized Springboard

  • Men complete six dives, women complete five
  • For both men and women, the first two dives must have a difficulty level of 2.0
  • The remaining dives for both men and women can be of any difficulty level
  • Both men and women must complete dives from at least four different categories with at least one of the dives being forward facing

BMX racing

BMX racing is a type of off-road bicycle racing. The format of BMX was derived from motocross racing. BMX bicycle races are sprint races on purpose-built off-road single-lap race tracks. The track usually consists of a starting gate for up to eight racers, a groomed, serpentine, dirt race course made of various jumps and rollers and a finish line. The course is usually flat, about 15 feet (4.6 m) wide and has large banked corners that help the riders maintain speed.

Bikes sizes
There are two BMX racing bikes sizes. One is the 20″ wheel bike. This bike is common with minors and is currently the most common class. The Cruiser bikes are any bikes with a 24″ wheel. However, any bikes that have a wheel larger than 24″ will still be considered Cruisers. Cruisers are more common with older racers and is rapidly growing. The cruiser style bike tends to be easier to jump and rolls better while the 20″ is seemingly more agile.[1]

Advantages
While BMX racing is an individual sport, teams are often formed from racers in different classifications for camaraderie and often for business exposure of a sponsoring organization or company. BMX racing rewards strength, quickness, and bike handling. Many successful BMX racers have gone on to leverage their skills in other forms of bicycle and motorcycle competitions.[1]

Track features
There are all types of BMX jumps, ranging from small rollers to massive step-up doubles. There are pro straights which are for junior and elite men. They are all doubles which range from about 6 m to 12 m, while “Class” straights have more flow and have many more range of jumps.[1]

Starting hill

The Starting hill marks the start of the track. Most BMX Tracks have a gate. The starting hill will normally provide all the speed for the remainder of the race. Generally, the larger the hill, the faster, so pro hills are much larger than the amateur ones.

Step-up

A jump of which’s landing is at a higher point than the jump itself

Berms

Turns are at an angle. Therefore, you can easily turn without having to brake.

Double

The double are two hills close to each other.

Step-down

A hill, then followed by a shorter hill.

Roller

A small hill, normally in groups.

Tabletop

A flat jump, normally for learning to jump.

Pro Set

A set of jumps with only a takeoff lip and a landing, usually spaced 7 to 15 apart.

Olympics
BMX racing became a medal sport at the 2008 Summer Olympics in Beijing under the UCI sanctioning body. Sanctioning body of the United States of America is USA BMX. USA BMX is certified under the UCI (International Cycling Union), which is recognized by the Olympic Committee

Appearance of archery in the Olympic

The second Olympic games, Paris 1900, saw the first appearance of archery. Seven disciplines in varying distances were contested. The next Olympics, St. Louis 1904, featured archery events, but no athletes outside the United States competed. At the 1908 Summer Olympics, three archery events were held. Archery was not featured at the 1912 Summer Olympics but reappeared in the 1920 Summer Olympics.

Between 1920 and 1972, archery was not contested at the Olympic games. The archery competition featured at the 1972 Summer Olympics in Munich consisted of a double FITA Round (from 2014 known as a ‘1440 Round’) competition with two events: men’s individual and women’s individual. This form of archery competition was held until the 1988 Summer Olympics, when team competition was added and the Grand FITA Round format was used. Starting at the 1992 Summer Olympics, the Olympic Round with head-to-head matches was adopted and has been used ever since.

In 1984 at Los Angeles, Neroli Fairhall of New Zealand was the first paraplegic competitor in the Olympic Games.