What is the CoR of a golf club?
The current limit to COR in golf clubs is 0.830, if a club is tested above this it would be ruled non-conforming. This means the club cannot transfer more than 83% of its energy to the ball. How is COR measured?
Why does the USGA limit the CoR of a clubhead?
This is one of the reasons why the USGA rule which limits the COR of a clubhead has the effect of penalizing the slower swing speed golfer much more than the high swing speed player."
What is the CoR of the club speed after impact?
The club speed after impact is subtracted from the ball speed after impact. This is then divided by the club speed before impact. So for example if a players club speed before was 110mph and they created a ball speed of 160 and had a club speed of 76 after impact the COR would be 0.76.
What is the CoR of a non-conforming club?
So for example if a players club speed before was 110mph and they created a ball speed of 160 and had a club speed of 76 after impact the COR would be 0.76. The current limit to COR in golf clubs is 0.830, if a club is tested above this it would be ruled non-conforming.
What does C mean on golf clubs?
A check with Taylor Made a short time ago confirmed it means "Conforming" Cart Bag. 910D2 12* 910F 15* & 17* R11 Irons 4-SW.
What does Cor mean in golf clubs?
coefficient of restitutionCOR is one of a few acronyms that golf equipment manufacturers use when describing their latest products - but what does it actually mean? 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 Cor in golf irons?
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.
What is the legal COR for a golf driver?
0.830The current COR limit in golf clubs is 0.830. Any club with a COR measuring higher than . 830 is ruled non-conforming. The terms "coefficient of restitution" and "COR" came into the mainstream golf lexicon as ultra-thin-faced drivers began to proliferate in the early 2000s.
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 HI COR driver?
HIGH (COR) COEFFICIENT OF RESTITUTION DESIGN COR is the measurement of how a ball, slingshots off the face of a driver.
What is CT in a golf driver?
"Characteristic time" (CT) is what golf's governing bodies — the USGA and R&A — measure to determine whether drivers conform to the limits within the Rules of Golf on "spring-like effect." Most simply put, characteristic time is the amount of time, measured in microseconds, there is contact between the clubface of a ...
What is smash factor?
Smash Factor is calculated by dividing the ball speed by the clubhead speed. For example, if you swing a driver with a clubhead speed of 100 mph and generate a ball speed of 150 mph, the Smash Factor is 1.50. So, the higher the Smash Factor, the more ball speed you are getting for a given clubhead speed.
What does Cor mean in physics?
The coefficient of restitution (COR, also denoted by e), is the ratio of the final to initial relative speed between two objects after they collide. It normally ranges from 0 to 1 where 1 would be a perfectly elastic collision.
What makes a golf driver illegal?
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.
Is the Krank driver Legal?
Krank drivers are legal and approved by the USGA. This means that you can use the club to compete in a professional golf tournament or at a tournament at your club. The fact that the Krank drivers are legal certainly makes them more marketable and appealing to a wide range of golfers.
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.
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 is the Cor in golf clubs?
"COR" is an acronym for "Coefficient of Restitution.".
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 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.".
What is the effect of the thin faces on a driver?
An effect of the thin faces is known as the "spring-like effect" or "trampoline effect": The face of the driver depresses as the ball is struck, then rebounds, providing a little extra oomph to the shot. A driver that exhibits this property will have a very high COR.
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.
Do fairway woods use COR?
But fairway woods, hybrids, and irons are still regulated using COR measurements.
Why do you cover your golf clubs?
The only reason why anybody covers (head covers) their clubs is to protect them. Generally the putter and the woods are more likely to get dinged than the irons and this is the only reason for covering (protecting) them, not to keep a hot driver hot.
Why do wood clubs have head covers?
Wood head covers were originally designed for wooden clubs for the same reason i.e. to protect the fine finish and thus prevent them from absorbing moisture. With todays oversize metal heads it is becoming more difficult to find a big enough head cover that is easy to put on and take off.
How fast should a golf ball go to fade?
But the distance problem is probably the incorrect launch conditions. You ball speed should be close to 130 mph and a launch angle of about 13 to 14 degrees and the spin rate of about 3,000 rpm.
What is the rule for golf clubs that are straight?
The rule requires that a shaft must be straight. If it is accidentally bent in the normal course of play (not in anger) the player may continue to use it for the remainder of the round even though it does not conform, or the club may be repaired without delaying play.
Who invented the graphite shaft?
Frank Thomas, inventor of the graphite shaft, is founder of Frankly Golf, a company dedicated to Helping Golfers. Frank is Chief Technical Advisor to The Golf Channel and Golf Digest. He served as Technical Director of the USGA for 26 years and directed the development of the GHIN System and introduced the Stimpmeter to the world of golf.
Who is the golf channel chief technical advisor?
Editor's Note: This is the latest in a new weekly feature from Golf Channel Chief Technical Advisor Frank Thomas. To submit a question for possible use in this column, email [email protected]
What is the CT test?
The CT test also measures the spring-like effect of a club face, except it uses a small, portable pendulum system that strikes the face with a steel ball. Sensors then read the amount of time the two objects stay in contact with each other. The limit of time placed on golf clubs is ...
Is CT testing accurate?
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. “What we do find is that CT testing off-center is not as accurate as COR,” Olsavsky says. “CT testing will read high, because it’s really a mechanical response versus the actual impact physics.”.
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.
Does the CT test always mimic the response of a golf ball?
Olsavsky’s gripe is that the CT test doesn’t always accurately mimic the response of a golf ball. “When you’re pinging [the steel ball in the CT test] a half-inch or more off-center, you get a higher response,” Olsavsky says.
Did Xander Schauffele fail the CT test?
As you may remember in 2019 ahead of The Open Championship, Xander Schauffele had a run-in with the R&A after his driver failed a CT test. During the aftermath of that ordeal, the PGA Tour implemented mandatory driver testing for the 2019-2020 season.