| 摘要 |
An archery arrow includes a tubular aluminum housing attached in an opening in the leading end of an aluminum arrow shaft. A hard insert with a plurality of thin, circular, annular, peripheral ridges is rotatably disposed in the housing, the smooth interior surface of the housing and the smooth surfaces of the ridges providing a very low friction bearing. The insert includes a threaded opening for receiving the threaded end of a stud of a broad blade arrowhead. During flight, the shaft spins rapidly due to offset fletching on the trailing end of the arrow, but the broad blade arrowhead spins relatively little, thereby avoiding windplaning of the arrow, and also substantially increasing penetration of the arrowhead into a target. In one embodiment, the blades of arrowheads are offset in a direction opposite to the offset of the fletching to cause the arrowhead to rotate rapidly in the direction opposite to the direction of rotation of the arrowhead shaft during flight, resulting in further decreased windplaning and increased arrow stability and accuracy.
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