thegolfguru | The Complete A-Z Of Golf

thegolfguru The Complete A-Z Of Golf: "With the improvement of technology, newer and better golf clubs are being released. However, not all of these clubs are endorsed by the USGA. Some of them, such as hollowed out titanium clubs, have a higher coefficient of restitution and impart a greater force on the golf ball. For this reason the USGA has declared that clubs with a coefficient of restitution greater than 0.83 are not approved. A coefficient of restitution of 0.83 means that a ball traveling at 100 M.P.H. will rebound off a metal plate at 83 M.P.H. "