公元前500年使用的细长的木质标枪中间缠有一层绳索,在投掷标枪时,运动员须抓住绳索的一端让标枪在空中自由旋转,这种旋转可以使标枪更稳。
公元前500年使用的细长的木质标枪中间缠有一层绳索,在投掷标枪时,运动员须抓住绳索的一端让标枪在空中自由旋转,这种旋转可以使标枪更稳。1908年奥运会上投掷*远的有50米,1976年增加到95米,1984年尤韦·洪在一次比赛中投出了104.80米的惊人成绩。国际业余田径联合会很快决定重新设计标枪,来限制其投掷距离。修改之后的标枪重心往前移动了4厘米,此时标枪能投掷的距离比修改前缩短了15米。
Javelin: The javelin was an event first enjoyed by the Mycenaeans at least 3000 year ago. The Greeks of 500 BC used thin wooden javelins with a cord wrapped around the centre of mass. When the javelin was thrown, the athlete would hold onto the end of the cord to make the javelin rotate freely through the air in much the same way that a toy gyroscope is made to rotate by pulling a string. The rotation stabilized the javelin by averaging any asymmetries in its construction about a central axis. At the London games in 1908 the winning throw was just over 50m. By 1976 this distance had increased to almost 95m and in non-Olympic event. The IAAF decided fairly quickly that the javelin had to be redesigned to underperform. According to Mont Hubbard of the University of California at Davis, the furthest distance a javelin could be thrown depended on how it was designed. When the rules were changed so that the centre of mass was moved 4cm forward, the total distance a javelin can travel is reduced 15m than they were before the rule change.