| 摘要 |
An archery arrow having a collapsible tail assembly that includes an arrow shaft having three vanes adjacent its butt end that are generally symetrically located relative the shaft peripheral surface, each vane being made of a piece of semi rigid plastic or plastic cloth material that has axially elongated first and second edge portions secured to the shaft with the first edge portions being longer than, and extending forwardly of, the second edge portion and a loop portion extending angularly between said edge portions and extending away from the shaft to in conjunction with the shaft provide bounded areas of progressively smaller cross section areas in transverse planes that are perpendicular to the shaft axis in a rearward direction. The juncture of the loop with the first edge portion along its length is angularly offset relative the shaft peripheral surface so that as air passes through the vane when the arrow is being shot, the air imparts a turning force to the arrow. In the first embodiment, the vane first and second edge portions are angularly spaced while in the second embodiment the second edge portion is secured to the first. As to the third embodiment, which is the preferred embodiment, the vane loop portion instead of providing bounded areas of progressively smaller cross sections in transverse planes that are perpendicular to the shaft axis in a rearward direction provides bounded areas that are of at least substantially the same size and shape, if not the same size and shape.
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