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knife throwing
Knife throwing is an art, sport, combat skill, or variously an entertainment technique, involving an artist skilled in the art of throwing knives, the weapons thrown, and a target.
==Basic principles==
Knife throwing, whether in a martial or sport application, involves the same basic principles of mechanics. The objective in each case is for the point to stick into the target with a sufficient amount of force. For this to be successful, accuracy, distance, number of rotations and placement of the body all must be taken into account.
If the thrower uses a spin technique, the knife will rotate during flight.〔(【引用サイトリンク】url=http://www.knifethrowing.info/physics_of_knife_throwing.html )〕 This means that the thrower, assuming they are throwing the same way every time, must either choose a specific distance for each type of throw or, more practically, make slight adjustments to the placement of the knife in the hand or to the throwing movement.〔(【引用サイトリンク】url=http://www.knifethrowing.info/training.html )〕 Another adjustment that can be made is the way the knife is held. If it is held at the blade when it is thrown, this makes it spin half, whereas if it is held by the handle, this makes a full spin. So if the thrower estimates he needs one and a half spins for the point to hit the target, he would hold the knife from the blade when it is thrown. If he feels he needs two full spins for it to hit the target point-first, then it would be held by the handle.
With the much more intricate no spin throwing techniques, the throwing motion is made as linear as possible, the knife's rotation being slowed down even more by an index finger on the spine during release.〔(【引用サイトリンク】url=http://www.knifethrowing.info/no_spin_knife_throwing.html )〕 Thrown no spin, knives will make no revolution or only a quarter spin before reaching the target (point first), but the no spin throws are not as accurate or stable in flight as the spin techniques.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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