Abstract
The purpose of this study was to identify the existence of the ball fitting which needs the high compression(soft) golf ball for slow speed golfers and the low compression(hard) golf balls for high speed golfers. To confirm the existence of the ball fitting we have measured the restitution of coefficient(COR) of golf balls, ball compressions measured by Atti method, the golf balls carry distances by golf robot test with Trackman III golf launch monitor. The changes of coefficient of restitution of golf ball accordance to ball temperature and ball speed have been measured. Ball temperatures were in the range of 20°C, impact speeds of ball toward to 400 pound(181kg) fixed square steel plate were 70, 85, 100, 115, 130 and 145mph. The various data of the 5 brands and 2, 3 or 2, 4 piece balls(total 50 balls) were measured at 20°C~24°C. The test results say that there is no golf ball fitting, compression is feel and cor is speed.
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