ABSTRACT
This paper reports the experimental results of kick back effect of the club-head at impact. The kick back effect comes with a newly discovered behavior of the shaft near the club-head at impact. To make clear this effect, eight strain gauges are attached along the shaft and very fast output signals at impact are recorded and analyzed. Thus the experiment revealed the propagation of a deformation wave from the club head to the grip end with the sound velocity, approximately 10Km/s. At the same time, the kick back effect has been observed.
