![]() ![]() 1909 the rule was first introduced and required that the 'club shall not contain any contrivances such springs.'. ![]() Looking at the History of this rule may help: If the face of the club deforms and recovers during impact, like a trampoline (see above Titanium Clubs), this takes up some of the deformation that would have otherwise been in the ball, the COR would increase as there are fewer losses in the deformation and recovery of the club face than in the ball. It has been found that the COR of the collision between the club head, which does not exhibit any Spring Like Effect (SLE) and a standard ball is about 0.768 at a head speed of about 110 mph (see above Wooden Clubs). ![]()
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