What is Cor in golf clubs?
In a golf context, Object A in that scenario is the golf club, and Object B is the thing the golf club is striking—the golf ball. Here's how COR matters in a golf club: If, say, a fairway wood or iron has a very high COR, then there is less energy loss at impact with the golf ball compared to a fairway wood or iron with a lower COR.
What is the cor test for drivers?
Prior to 2004, the R&A and the USGA tested drivers using a COR test, which tests for the spring-like effect of a club head. To measure COR of a golf club, tests were conducted by firing a golf ball from an air cannon at a club head and measuring the velocity at which the ball bounced off of different areas on the face.
What is Cor in physics?
First, the 'science-y' stuff. COR stands for coefficient of restitution and is the ratio of the final to initial relative velocity between two objects after they collide. Sir Isaac Newton first developed the mathematics in the late 1600s.
How accurate is the cor test for golf clubs?
“The COR test was really accurate to the physics of what happens with a golf club hitting a golf ball,” said Tom Olsavsky, VP of R&D at Cobra, on our Fully Equipped podcast. “If you have a COR test and you hit it off-center, [the face is] going to be slow because of the inertial effects and the speed effects.”
What is Cor in golf terms?
The coefficient of restitution is basically a term that describes energy transferred between two objects. The COR figure for Object A is a measurement of Object A's ability to transfer energy to Object B when the two collide. So in terms of golf, A is the golf club and B is the golf ball.
What is Cor in a golf driver?
What is COR in golf clubs? COR stands for Coefficient of Restitution. This is defined as the ratio of the final velocity to the initial velocity between two objects after their collision. Basically COR is a measurement of the energy loss or retention when two objects collide.
How do you measure COR?
How is COR measured? COR is measured by launching a ball at the face of the golf club and measuring the speed velocity of the ball before and after it has made contact with the clubface.
What is a high COR driver?
HIGH (COR) COEFFICIENT OF RESTITUTION DESIGN COR is the measurement of how a ball, slingshots off the face of a driver.
What makes a golf ball Illegal?
Legal golf balls can't be smaller than 1.68 inches in diameter. The Polara balls have a diameter of 1.68 inches (the same size as normal). If you have a smaller ball, you'll have less drag and that should give you more distance.
How much further do illegal golf balls go?
In fact, some illegal balls can add as much as 15 yards to your shots. Of course, there are a couple of hitches with illegal balls. While they are a blast for casual play, they won't do anything to improve your game.
What does CT mean in golf drivers?
characteristic timeWith distance becoming a bigger and bigger topic in the world of professional golf, an acronym that has risen alongside that is CT which means 'characteristic time'.
What is coefficient of restitution golf?
Coefficient of restitution, or COR for short, is a measure that tells you how much energy is transferred from the golf club to the golf ball at impact. It's a measure of club and material efficiency. If a club were totally efficient, COR would be 1.
What is MOI in golf?
Generally known as MOI in the golf world, moment of inertia is basically the measure of a clubhead's resistance to twisting when a ball is struck away from the sweet spot. This means the higher the clubhead's MOI, the less it will twist and the straighter the ball will fly on a mishit.
What is an illegal golf driver?
First, what is an illegal golf driver? Any golf driver that doesn't conform to USGA and R&A rules is considered illegal. The most common type of illegal golf drivers offer a high COR. A COR value above 0.83 (legal max) will offer more distance for most golfers that use it.
Does shaving a driver work?
The data suggest that the shaved face driver does exactly what it is intended to do: Shaving the face of a driver produces ball speeds on average of 4 mph faster than a stock head. Higher ball speeds equal longer distances; the shaved Jetspeed traveled a full 10 yards farther than its USGA-conforming counterpart.
What makes a driver non-conforming?
In one word: DISTANCE. For most golfers, distance is the main thing you should be looking for in a non-conforming driver. Find a happy balance between what feels right and what will produce results. You may need to practice a bit to get used to a larger head and longer shaft.
What is coefficient of restitution in golf?
Coefficient of restitution, or COR for short, is a measure that tells you how much energy is transferred from the golf club to the golf ball at impact. It's a measure of club and material efficiency. If a club were totally efficient, COR would be 1.
What is Moi golf driver?
Generally known as MOI in the golf world, moment of inertia is basically the measure of a clubhead's resistance to twisting when a ball is struck away from the sweet spot. This means the higher the clubhead's MOI, the less it will twist and the straighter the ball will fly on a mishit.
What is the coefficient of restitution for a golf ball?
roughly 0.7The coefficient of restitution of a golf ball when hit hard is roughly 0.7; the corresponding value for a baseball of prewar construction is about 0.45.
What is a hot face in golf?
Hot face equals more ball speed for the same swing speed! That is what I think when "hot face" is thrown out, another way of describing higher ball speeds across the face since COR is capped.
What does COR mean in physics?
COR stands for Coefficient of Restitution. This is defined as the ratio of the final velocity to the initial velocity between two objects after their collision.
How is COR measured?
To measure COR you need to launch a ball at the clubface. The speed velocity of the ball before and after it has made contact with the clubface is then measured. This is a complicated test to run so the R&A introduced a measurement called Characteristic Time (CT) to measure the elasticity of the clubface.
How is COR calculated?
The club speed after impact is subtracted from the ball speed after impact. This is then divided by the club speed before impact.
How does COR affect driving distance?
How does COR effect driving distance? Whenever you hit a shot there is always some energy lost when the club hits the ball. At impact the ball is compressed against the clubface and can squash up to 30% of its diameter against the driver face. This is where the energy is lost.
What is the COR of a collision?
The COR measurement is always expressed as a number between 0.000 and 1.000, where 0.000 means all energy is lost and 1.000 shows a perfectly elastic collision where no energy is lost.
Why does a high COR face lose energy?
This means the face loses more energy as the clubface is flexing more. The ball however loses a lot less energy due to the reduced compression against the face.
What does Cor mean in golf?
Updated May 24, 2019. "COR" is an acronym for "Coefficient of Restitution .". It's a term from the world of science and physics, but one that many golfers know because it is also used in conjunction with golf clubs. "Coefficient of restitution" is a term describing the energy transference between two objects.
What is the Cor in golf clubs?
"COR" is an acronym for "Coefficient of Restitution.".
What is the current COR limit for golf clubs?
The current COR limit in golf clubs is 0.830. Any club with a COR measuring higher than .830 is ruled non-conforming .
What happens when a cue ball hits a target ball?
When the cue ball hits the target ball, the cue ball stops dead and the target ball takes off at almost the same , exact speed that the cue ball had when it made contact with the target ball. This indicates that virtually all of the energy of the cue ball was transferred to the target ball to propel it onward.".
Do drivers use COR?
However, the governing bodies no longer use COR to regulate drivers —they instead use something called " characteristic time" or "CT ." COR and CT measurements do track one another, however. This fact, combined with the fact that manufacturers all build drivers to max out the permitted amount of COR, has caused the term to lose some of its relevance.
Can a golf club have a 1.000 COR?
A "perfectly elastic collision"—a COR of 1.000—is impossible in a golf club-golf ball collision. Therefore, no golf club can ever have a 1.000 COR. Why? It's because the clubface and the golf ball are made from completely different materials, and have two totally different weights or masses.
What is a cor in golf?
In layman’s terms, COR is a measure of how efficiently the clubface transfers energy onto the golf ball. However, it wasn’t until the late 1990s that COR gained prominence in the golfer’s vernacular.
What does COR stand for in science?
First, the 'science-y' stuff. COR stands for coefficient of restitution and is the ratio of the final to initial relative velocity between two objects after they collide.
What is the COR limit for golf balls?
It was at this stage that the R&A and USGA stepped in. In 2003, they set the universal limit for COR at 0.83 (meaning 83% of the energy in the collision of the driver head with a golf ball is transferred from the head to the ball).
Is COR a reserve?
In recent years, thanks again to new materials, manufacturing techniques and technologies, COR has become no longer the reserve of the driver market. Today’s fairway woods, hybrids and even irons are engineered to achieve maximum COR and get as close to the 0.83 limit as possible in order to deliver maximum distance throughout the bag.
What is COR?
COR is an acronym that stands for “Coefficient of Restitution, and is a term that originates from the world of physics, but has now been applied to the world of golf.
What is CT?
In 2004, the USGA and the R&A decided to move away from COR values to regulate drivers and instead have decided to use a term called characteristic time (CT).
Why Do They Matter?
Now, that you know what these measures are, why do they matter and how do they impact your golf game?
Looking For a New Driver?
Check out our entire inventory of drivers that you can purchase and fully customize online at our online store, mortongolfsales.com.
What is COR?
COR is an acronym that stands for “Coefficient of Restitution, and is a term that originates from the world of physics, but has now been applied to the world of golf.
What is CT?
In 2004, the USGA and the R&A decided to move away from COR values to regulate drivers and instead have decided to use a term called characteristic time (CT).
Why Do They Matter?
Now, that you know what these measures are, why do they matter and how do they impact your golf game?
Looking For a New Driver?
Check out our entire inventory of drivers that you can purchase and fully customize online at our online store, mortongolfsales.com.
What is the COR for a car?
According to the USGA, COR couldn’t exceed 0.822 with a tolerance of 0.08, so any driver measuring over 0.830 was deemed illegal.
Does the CT test always mimic a golf ball?
Olsavsky’s gripe is that the CT test doesn’t always accurately mimic the response of a golf ball.
Is CT a replacement for COR?
Due to the differences in how the tests are setup and measured, however, the CT test is not a perfect replacement for the COR test, according to Olsavsky.
Is it illegal to use a CT test on a golf club?
Therefore, any golf club that measures higher than 257 milliseconds on the CT test is deemed illegal. The CT test, being that it’s just a small pendulum device, is “really easy to use,” according to Olsavsky. Actually, some OEM Tour Trucks that travel to PGA Tour events each week have a CT testing setup right in their truck.
