Explanation of javelin throw

 Explanation of javelin throw

one of the throwing events in track and field It is an event that competes in the streets by throwing spears with human power.

It was an ancient Olympic pentathlon, long jump, running, discus throwing, javelin throwing, and wrestling. 

It is not clear when the javelin throw began as a game, but the ancient pentathlon was said to have been held for the first time during the 18th Olympics, and it was around that time that it became an official event. 

Ancient Greek spears were about the height of a human being and were a little thicker than the thumb.

There were two types of windows: one with a sharp-cut taeji and one with nothing attached. 

The former is intended to accurately guess the goal and was mainly used in gymnastics practice ranges. 

The latter was to compete for throwing far, and this was the window to the pentathlon. A 1 to 1.5ft leather strap was wrapped around the handle, and the end of the string was left about 3 to 4 in to make a round ring, and one index finger or middle finger was inserted into the ring and thrown.

In the modern Olympics, it was adopted as an official event at the 1908 London Olympics, and the women's team was adopted at the 1932 LA Olympics. The weight of the spear is 800g for men and 600g for women. It has the best record among throwing events.

The size of the window is 2.6-2.7m long for men, weighs 800g, and is 2.5~3.0cm in diameter. 600g for 2.2 to 2.3m in women, 2.0 to 2.5cm in diameter. The handle part that prevents slipping by winding thread-like things is 15 to 16cm for men and 14 to 15cm for women.

Run for about 20 to 30m and throw it from the back of the scratch board marked by an arc with a radius of 8m. 

When a window falls to the ground, it becomes invalid if the other part of the window touches it before the end of the window, or if any part of the stadium comes out of the scratchboard line. 

In addition, the thrown window becomes invalid if it does not fall within an angle line of about 29° drawn on the ground. 

To measure the thrown distance, measure it from the nearest point where the window fell to the inside of the arc, and on the line from the drop point to the centrifugal center.

When thrown, the tip of the window should first touch the ground within the effective range. 

The timing of the first round shall not exceed 1 minute and 30 seconds, and the competitor will be disqualified if the player leaves the run-up section before the window lands. 

If there are more than eight athletes, they will be given three chances each, and if there are less than eight, they will be given six chances each. 

The end of the window is made of metal, and the grip at the center is wound with a string so that it does not slip. 

Since throwing requires accuracy, flexibility of the arm is an essential factor. 

The optimal projection angle is 25–40° with a distance of 100 m and a pitch speed of 31 m/sec, or 112 km/h.

It is an event where various safety accidents occur frequently. 

It's probably because throwing a spear is a weapon, but it happens more than archery and shooting. 

Due to the sharp window, the referee standing at the stadium to measure the record was injured or killed by the window. 

This is often caused by unexpected accidents due to the classical screening method. 

With the improvement of record measurement systems in recent years, there are few such accidents.

At a youth event in Düsseldorf, Germany, on 27 September 2012, a 74-year-old veteran referee, Dieter Strach, was stabbed to death by a spear thrown by a 15-year-old player.