A consideration on the relationship between the vain shape and the rotation and vibration of shaft of Archery

Abstract

Archery has many competitors around the world, but new materials are used for the parts of bows as technology develops in recent years. Due to the diversification of new materials, there are increasing number of unexplained areas of archery performance. One of them is the arrow feather (Vain). Vain is roughly divided into rotary and non-rotary types. Currently, the rotary type is mainly the drag type, but if a lift type rotary vane can be developed, the rotational force can be obtained with a low drag, so it is considered that a vane with better performance can be achieved. If we can clarify the characteristics and common points of Vain that lead to higher scores, we can expect to develop new vanes. In wind tunnel experiments, using a jig with an arrow model, measurement and analysis were performed on the rotational performance and convergence performance of the arrow model at a uniform flow velocity of 20 m/s (1/3 of the actual arrow speed). To evaluate the performance of Vane, the rotational performance was evaluated by the number of revolutions for each of the non-converging motion (at rest) and the converging motion (vibration), and the convergence performance was evaluated by the time until convergence of vibration. In the performance evaluation of off-the-shelf products, it became clear that rotary vanes can be further classified into those with top pitches and those that do not, and those with many users worldwide do not have top pitches.