What is coefficient of Restitution in golf?
Some golf fans may not be familiar with characteristic time, but they may have heard of coefficient of restitution. 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.
What is Cor (coefficient of restitution)?
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.
What is the COR limit in golf clubs?
The USGA and R&A regulate COR in golf clubs to prevent manufacturers from making golf clubs that totally overwhelm golf courses with distance. The current COR limit in golf clubs is 0.830. Any club with a COR measuring higher than .830 is ruled non-conforming .
How elastic is the collision of a golf ball and driver?
It is impossible for the collision of your driver head and your golf ball to produce a perfectly elastic collision (COR of 1.000) in which all energy is transferred, for two reasons: 1.The clubface and the ball are made from completely different materials. 2. The clubhead and the ball are of two totally different weights, or masses.
What is coefficient of restitution of in golf driver?
However, the USGA and R&A limit maximum coefficient of restitution to 0.83, meaning 83 percent of energy from a club can be transferred to a ball at impact.
What degree should I hit my driver?
The ideal driver loft depends on your swing speed and the attack angle. Average players that swing the club less than 95 MPH will likely find that a 10.5-degree driver performs the best. Better players who can control their drives and want the most distance will lean more towards a 9-degree driver.
What is CT on a 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 Cor in golf drivers?
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.
Do any pros use a 10.5 degree driver?
At the WGC-HSBC Champions, Dustin Johnson took the title using a TaylorMade SLDR driver with 10.5 degrees loft. Although TaylorMade has recently been touting the benefits of "lofting up" with its new driver, it's actually been a trend on the PGA Tour for more than a decade.
What flex should my driver be?
In general, golfers with driver swing speeds over 95 mph should play stiff flex shafts, and those under 95 mph should play regular flex. Shafts also come in extra stiff (105+ mph) and senior flex (under 85 mph).
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.
What is CT and Cor in golf?
CT is a measurement only used for drivers whereas COR is still used to measure fairway woods, hybrids and irons. Don't forget to follow Golf Monthly on Facebook, Twitter and Instagram for all the latest golf news.
What is CTA in golf?
In 2004, the USGA moved to a different test, called 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.
Are Krank Golf Drivers 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 is the longest non conforming driver?
#2: Nonconforming Geek Golf Dot Com Driver It was also used to hit the longest drive in competition history by Mike Dobbyn measuring 551 yards! The main selling point of this club is its COR.
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 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 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.
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.".
Does swing speed increase distance difference?
It is true that as swing speed increases, the distance difference is greater. And likewise, as swing speed decreases the distance difference for each increment of the COR measurement is less.
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 the 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.
What is characteristic time?
Characteristic time, or CT for short, is a measure of long the golf ball stays on the club face at impact. It is a measure that tells us the elasticity of the materials in the club face (and golf ball for that matter). The longer the characteristic time, the more spring-like the face is.
Is Xander Schauffele's driver illegal?
Many golf fans were shocked to learn Xander Schauffele's driver was ruled illegal by the R&A ahead of the 2019 British Open Championship. Schauffele talked about the testing, which he supports, and the resulting fallout after his second round at Royal Portrush.
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.
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.
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.
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]