| 摘要 |
<p>The present invention relates to an arrow shaft marked by a position relating straightness in advance, on that a distorted position of the maximum straightness of the arrow shaft, which is formed when it is manufactured, is marked by a marker, so that feathers can be attached by the straightness indication marking, and thus an archer can attach the feathers in an optimized state for his or her shooting habit to improve accuracy of the arrow shooting. The straightness indication marking is formed on an outer peripheral surface of a rear portion of the arrow shaft at a position located an actual center line passing a point where the highest deviation is between a reference center line (BL) of the arrow shaft in a longitudinal direction and a center of a cross section of each position in the longitudinal direction thereof, supposing that the hollow tubular arrow shaft is ideally straight.</p> |
