Four-seam fastballs, especially when thrown over the top, tend to be rather straight pitches anyway and so don't suffer much from the straightening out as do other pitches. After all, losing 20 percent of 4 is a lot less harsh then losing 20 percent of 10.
A 4-seam fastball四縫線快速球抓球時和缝線成垂直 而滾動時可見四條缝線 = a rising fastball or a cross-seam fastball, 稱為上飄快速球 這種球之稱法和two-seam fastball抓球時延著缝線持球互相對應
A four-seam fastball, also called a rising fastball or a cross-seam fastball, is a pitch in baseball. It is a member of the fastball family. This pitch is gripped across the seams, in contrast to the two-seam fastball which is gripped along the seams. This pitch is known a four-seam fastball because when the ball is thrown, the ball rotates such that there are four seams rotating in the air. This pitch typically will stay straight depending on the pitcher's arm when the ball is released. The lower the pitcher's arm angle, the more the ball will move on this pitch. Conversely, the higher the arm angle, the less the ball will move on this pitch.
本文出自下列網頁: The fastball: cooking with gas快速球與氣流(空氣)
本句出自本篇由物理學角度探討丹佛COORS球場海拔 炎熱溫度 稀薄空氣等隊直球之影響
· 1 decade ago