부산대학교 도서관

The radius of swing path in backswing is so large and decreased in downswing through late hitting that the club head speed may increase abruptly by the conservation of angular momentum. The ideal angle condition of optimum distance and accuracy in driving is 45 degrees in downswing which is called 'slot swing'. A swing difference between the pros and the amateurs has been found that the pros' backswing angle is bigger than downswing angle while the amateurs' downswing is bigger than backswing. Thus most of the amateurs do not follow the 'slot swing' principle and LPGA pros' downswing angle have more deviation from the 45 angle standard than KPGA pros. The apparent difference between the pros and the amateurs in the gap of backswing angle and downswing angle may be deferred as the cause for the poor distance and accuracy problems of amateur golfers.