What Does the Term COR Mean For a Golf Club?

What Does the Term COR Mean For a Golf Club?

When two objects collide, the energy transfer is expressed as a measurement of energy retention or loss, with 0.000 being the loss of all energy and 1.000 being perfect transfer of energy from one object to another.

There are two reasons that a golf club and golf ball can not result in a perfect elastic collision with the COR being equal to 1:

a. Club faces and balls are manufactured from completely different materials.

b. Club faces and balls are of vastly different weights (or masses).

An example of a collision of two objects where the energy transfer is very high is in the game of pool. A cue ball transfer almost all its energy to the object ball, causing it to speed off at almost the same speed as the cue ball before it struck the object ball, while the cue almost stops. In this case the balls are of the same material and weight.

Here is an example that will give an idea of the increased distance obtainable with increased COR: A driver with a face COR of 0.830 will hit a ball 4.2 yards farther than a driver with a face COR of 0.820, assuming a 100 mph swing speed.

The USGA has limited the COR for any club face to 0.830. It doesn't mean much to the average slow swinging golfer, now that almost all legal drivers are manufactured to be at the 0.830 COR level. It is, however, a distinct advantage for the golfer with the faster swing speed because the high COR works better for him.

Tropical Fish Shower Curtains surge protector consumer reports