Patent ID: 9593920
Date: 2017-03-14
CPC Classifications: F42B

Claim:
1. A cylindrical arrow shaft, comprising: a straightness marking formed on the outer circumferential surface of the arrow shaft, wherein when the arrow shaft is placed at a position where a deviation between the actual center line and the ideal reference center line of the arrow shaft becomes a maximum, a closed curve is formed by interconnecting an ideal reference center line (BL) and an outer circumferential line of the arrow shaft at the position, and the straightness marking is placed on the outer circumferential line of the arrow shaft; wherein the straightness marking is formed on a rear portion of the arrow shaft; wherein a reference fletching is mounted on a position having the straightness marking; and wherein one or more non-reference fletchings are mounted with spacing apart from the reference fletching in a circumferential direction.