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{{citations|date=April 2008}} |
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I kill any one who breaks my window or gives me 2 hour long lecture! Golf balls in the head! |
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[[Image:Golfball.jpg|thumb|right|260px|A golf ball next to a hole]] |
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A '''golf ball''' is a [[ball]] designed to be used in the game of [[golf]]. |
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A regulation golf ball weighs no more than 1.620 [[ounces|oz]] (45.93 [[gram]]s), with a diameter over 1.680 [[inches|in]] (42.67 [[millimetre|mm]]), and is symmetrically [[spherical]] in shape. Like [[Golf club (equipment)|golf clubs]], golf balls are subject to testing and approval by the [[Royal and Ancient Golf Club of St Andrews]] and the [[United States Golf Association]], and those that do not conform with regulations may not be used in competitions ''(Rule 5-1 — also see [[rules of golf]])''. |
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==History== |
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[[Wood]]en balls were used until the early 17th century, when the ''featherie'' ball was invented. This added a new and exciting feature to the game of golf. A featherie is a hand sewn leather pouch stuffed with [[goose]] [[feather]]s and coated with paint. The feathers in the ball were enough to fill a top hat. They were boiled and put in the cowhide bag. As it cooled, the feathers would expand and the hide would shrink, making a compact ball. Due to its superior flight characteristics, the featherie remained the standard ball for more than two centuries. However, an experienced ball maker could only make about two in one day, so they were expensive. A single ball would cost between 2 and 5 sterling, which is the equivalent of $150 and $400 today. Also, it was hard to make a perfectly spherical ball, and because of that, the ball often flew irregularly. When playing in wet weather, the stiches in the ball would rot, and the ball would split open after hitting a hard surface. |
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In 1848, the Rev. Dr. Robert Adams (or [[Robert Adam Paterson]])<ref>Sources conflict as to the exact name.</ref> invented the [[gutta-percha]] ball (or ''guttie''). The gutta was created from dried sap of a Sapodilla Tree. The sap had a rubber-like feel and could be made round by heating and shaping it while hot. Accidentally, it was discovered that defects in the sphere could provide a ball with a truer flight than a pure sphere. Thus, makers started creating intentional defects in the surface to have a more consistent ball flight. Because gutties were cheaper to produce and could be manufactured with textured surfaces to improve their aerodynamic qualities, they replaced feather balls completely within a few years. |
|||
In the 20th century, multi-layer balls were developed, first as wound balls consisting of a solid or liquid-filled core wound with a layer of rubber thread and a thin outer shell. This idea was first discovered by Coburn Haskell of Cleveland, Ohio in 1898. Haskell had driven to nearby Akron to keep a golf date with Bertram Work, then superintendent of B.F. Goodrich. While he waited for Work at the plant, Haskell idly wound a long rubber thread into a ball. When he bounced the ball, it flew almost to the ceiling. Work suggested Haskell put a cover on the creation, and that was the birth of the 20th century golf ball. The design allowed manufacturers to fine-tune the length, spin and "feel" characteristics of balls. Wound balls were especially valued for their soft feel. |
|||
Today's golf balls have progressed into having cores of [[titanium]] compounds, hybrid materials, softer shells and a more pressurized core. They usually consist of a two-, three-, or four-layer design, (named either a two-piece, three-piece, or four-piece ball) consisting of various synthetic materials like surlyn or [[urethane]] blends. They come in a great variety of playing characteristics to suit the needs of golfers of different abilities. |
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==Regulations== |
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The diameter of the golf ball cannot be any smaller than 1.680 inches. The maximum velocity of the ball may not exceed 250 feet per second under test conditions and the weight of the ball may not exceed 1.620 ounces. |
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==Aerodynamics== |
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When a golf ball is hit, the impact which lasts less than a [[1 E-3 s|millisecond]], determines the ball’s [[velocity]], launch [[angle]] and [[rotation|spin]] rate, all of which influence its [[trajectory]] (and its behavior when it hits the ground). |
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A ball moving through air experiences two major aerodynamic forces, [[Lift (force)|lift]] and [[drag (physics)|drag]]. Dimpled balls fly farther than non-dimpled balls due to the combination of two effects: |
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Firstly, the dimples delay separation of the [[boundary layer]] from the ball. Early separation, as seen on a smooth sphere, causes significant wake turbulence, the principal cause of drag. The separation delay caused by the dimples therefore reduces this wake turbulence, and hence the drag. |
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Secondly, [[backspin]] generates lift by deforming the airflow around the ball, in a similar manner to an airplane [[wing]]. This is called the [[Magnus effect]]. Backspin is imparted in almost every shot due to the golf club's loft (i.e. angle between the clubface and a vertical plane). A backspinning ball experiences an upward lift force which makes it fly higher and longer than a ball without spin.[http://math.ucr.edu/home/baez/physics/General/golf.html] Sidespin occurs when the clubface is not aligned perpendicularly to the direction of [[Golf#The golf swing|swing]], leading to a lift force that makes the ball curve to one side or the other. Unfortunately the dimples magnify this effect as well as the more desirable upward lift derived from pure backspin. (Some dimple designs are claimed to reduce sidespin effects.) |
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In order to keep the aerodynamics optimal, the ball needs to be clean. Golfers can wash their balls manually, but there are also mechanical [[ball washer]]s available. |
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==Design== |
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[[Image:Two similar icosahedron golf ball designs.jpg|450px|thumb|These two balls are disclosed in {{US patent|4560168}}. These two balls are easily made with a two-piece mold. Since there is no dimple located on any of the slash-dotted circles (one is marked red), the mold can be two [[hemispheres]].]] |
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Most golf balls on sale today have about 300 – 450 dimples. There were a few balls having over 500 dimples before. The record holder was a ball with 1,070 dimples — 414 larger ones (in four different sizes) and 656 pinhead-sized ones. All brands of balls, except one, have even-numbered dimples. The only odd-numbered ball on the market is a ball with 333 dimples, called the Srixon AD333. |
|||
Officially sanctioned balls are designed to be as [[symmetry|symmetrical]] as possible. This symmetry is the result of a dispute that stemmed from the Polara, a ball sold in the late 1970s that had six rows of normal dimples on its equator but very shallow dimples elsewhere. This asymmetrical design helped the ball self-adjust its [[spin (physics)|spin]]-axis during the flight. The USGA refused to sanction it for tournament play and, in 1981, changed the rules to ban aerodynamic asymmetrical balls. Polara's producer sued the USGA and the association paid US$1.375 million in a 1985 out-of-court settlement. |
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The [[United States Patent and Trademark Office]]'s [[patent]] [[database]] is a good source of past dimple designs. Most designs are based on [[Platonic solid]]s such as [[icosahedron]]. |
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Golf balls come in many different colors, which helps with finding the ball when lost, or in distinguishing one player's ball from another's. White is the most common color. |
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===Hexagonal Dimples=== |
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One of the new technological advances in a golf ball is to have hexagonal dimples. This enables the ball to have less drag than a normally dimpled golf ball. The balls have variations on the size of the dimples and some have deeper dimples than others. [[Callaway Golf]] is the main supplier of the hexagonal design golf balls, such as the Callaway HX. |
|||
==Selection== |
|||
There are many types of golf balls on the market, and customers often face a difficult decision. Golf balls are divided into two categories: recreational and advanced balls. Recreational balls are oriented toward the ordinary golfer, who generally have low swing speeds (80 miles per hour or lower) and lose golf balls on the course easily. These balls are made of two layers, with the cover firmer than the core. Their low compression and side spin reduction characteristics suit the lower swing speeds of average golfers quite well. Furthermore, they generally have lower prices than the advanced balls. |
|||
Advanced balls are made of multiple layers (three or more), with a soft cover and firm core. They induce a greater amount of spin from lofted shots (wedges especially), as well as a sensation of softness in the hands in short-range shots. However, these balls require a much greater swing speed that only the physically strong players could carry out to compress at impact. If the compression of a golf ball does not match a golfer's swing speed, either the lack of compression or over-compression will occur, resulting in loss of distance. There are also many brands and colors to choose from, with colored balls and better brands generally being more expensive, making an individual's choice more difficult. |
|||
==Trick Balls== |
|||
A number of designs of novelty ball have been introduced over the years, mainly as practical jokes for the amusement of fellow golfers, but also as "cheater" balls that do not conform to the [[Rules of Golf]]. All of these are banned in sanctioned games, but can be amusing in informal play: |
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* ''Breakaway'' balls are brittle and hollow, and shatter into many small pieces when hit. |
|||
* ''Exploding'' balls are similar, but employ a small explosive device that disintegrates the ball when hit. Many courses have banned these as the charge can damage the turf, the player's club or even cause injury, leading manufacturers to develop the breakaway. |
|||
* ''Stallers'' are far softer than a normal golf ball, allowing them to be compressed far more easily and are given greater backspin when hit. Both of these give the ball a huge amount of lift, making shots climb very high into the air with very little distance travelled over the ground. In the right conditions, such a ball may travel backwards along its flight path or even perform a loop-the-loop. |
|||
* ''Sponge'' balls are softer still; they are generally used as indoor or backyard practice balls, but some are deceptively similar in appearance to a normal ball. Such a ball will travel less than a quarter of the distance of a normal golf ball. |
|||
* ''Wobblers'' have a center of mass that is not in the exact center of the ball or is loose within the ball. When putted, the ball will move unpredictably off the intended line. |
|||
* ''Floaters'' are less dense than a regulation golf ball so when hit into a water hazard, they bob on the surface when a normal ball would sink. |
|||
* ''Super-distance'' balls have deeper dimples and are heavier than allowed by regulation, which allows them first to maintain momentum and second to maintain a thicker "envelope" of still air around them which reduces turbulence and wind resistance. Marketers of these balls generally advertise a 12-yard gain on most distance shots. |
|||
* " phantom balls " disapear in a watery mist when hit. |
|||
* " streamer balls " let go of a 15 foot red stream when hit. |
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==Used and refurbished golf balls== |
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Used golf balls are golf balls that have been played, most likely hit into a water hazard, then retrieved, cleaned up and resold. Used golf balls comes in different gradings - one well-accepted standard is:[http://www.lostgolfballs.com/info-exec/display/grading_scale] |
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{| class="wikitable" |
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|- |
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|- |
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| '''AAAAA (1st Quality)''' |
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| '''AAAA (2nd Quality)''' |
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| '''AAA (3rd Quality)''' |
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| '''AA (4th Quality)''' |
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|- |
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| Highest quality ball in the marketplace. Like new, perfect to very near perfect. A "One Hit Wonder" Ball. |
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| Very slightly blemished balls. May have minor imperfections. |
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| Slightly scuffed or blemished balls that may have minor discoloration. |
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| Appropriate for range and green practice. Survived a round of golf. |
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|} |
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Refurbished, sometimes called reconditioned or refinished, golf balls are different than used. Refurbished golf balls may look new, but do not meet the manufacturer's original requirements. In the processing procedure, the golf ball is stripped of its original coating and then a new cover/paint in applied. The condition of the ball core may be in question with a refurbished golf ball. |
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==RFID== |
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Recent advances in golf ball technology include placing an [[RFID]] [[transponder]] in the core of the ball. While only minimally affecting the flight characteristics of the ball, this transponder allows errant balls to be located with a hand-held scanner. RFID technology is also used in some computerized [[driving range]]s. In this format, each ball used at the range has its own unique transponder code. When dispensed, the range registers each dispensed ball to the player, who then hits them towards targets in the range. When the player hits a ball into a target, they receive distance and accuracy information calculated by the computer. |
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==World records== |
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Jason Zuback broke the world ball speed record on an episode of Sports Science with a golf ball speed of 328 km/h (204 mph){{Fact|date=February 2008}}. The previous record of 302 km/h (188 mph) was held by José Ramón Areitio, a [[Jai Alai]] player{{Fact|date=February 2008}}. |
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==External links== |
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* [http://www.kidzworld.com/site/p1147.htm Golf Ball Dimples - How Many?] (written for kids) |
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* [http://www.golfball-guide.de/museum.htm Online golf ball museum with > 1000 different golf balls] |
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* [http://www.lostgolfballs.com/info-exec/display/best_ball_for_me Selecting the best ball that fits you] |
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* [http://wings.avkids.com/Book/Sports/instructor/golf-01.html Golf ball aerodynamics] |
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* [http://www.golfballselector.com/howItWorks/faq.php Player performance factors and playing conditions to consider in selecting an appropriate golf ball] |
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* [http://www.golfjoy.com/golf_physics/dynamics.asp Flight Dynamics of Golf Balls] |
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* [http://www.knetgolf.com/catalog.aspx?n=How+To+Buy+Balls Choose the proper golf ball for your game] |
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=== History === |
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* [http://www.thedesignshop.com/history.htm The evolution of the golf ball] |
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* [http://www.golfeurope.com/almanac/history/golf_ball.htm A history of the golf ball] |
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* [http://www.taylor-hobson.com/dimpled-golf%20-ball.html Evolution of the Dimpled Golf Ball] |
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* [http://www.lostgolfballs.com/info-exec/display/grading_scale Grading of a Recycled Golf Ball] |
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* [http://www.golfball-guide.de/index.html All about Golf Balls] |
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* [http://library.thinkquest.org/10556/english/high/history/hist05.htm History of the golf ball at The Golf Course] |
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* [http://www.knetgolf.com/HowWeGrade.aspx Learn how golf balls are graded by the worlds most trusted recycled golf ball company] |
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== Footnotes == |
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{{reflist}} |
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[[Category:Golf equipment]] |
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[[Category:Balls]] |
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[[cs:Golfový míček]] |
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[[da:Golfbold]] |
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[[de:Physik des Golfballs]] |
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[[es:Bola de golf]] |
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[[fr:Balle de golf]] |
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[[nl:Golfbal]] |
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[[no:Golfball]] |
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[[nn:Golfball]] |
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[[pl:Piłka golfowa]] |
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[[sr:Голф лоптица]] |
Revision as of 04:58, 26 June 2008
![](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Golfball.jpg/260px-Golfball.jpg)
A golf ball is a ball designed to be used in the game of golf.
A regulation golf ball weighs no more than 1.620 oz (45.93 grams), with a diameter over 1.680 in (42.67 mm), and is symmetrically spherical in shape. Like golf clubs, golf balls are subject to testing and approval by the Royal and Ancient Golf Club of St Andrews and the United States Golf Association, and those that do not conform with regulations may not be used in competitions (Rule 5-1 — also see rules of golf).
History
Wooden balls were used until the early 17th century, when the featherie ball was invented. This added a new and exciting feature to the game of golf. A featherie is a hand sewn leather pouch stuffed with goose feathers and coated with paint. The feathers in the ball were enough to fill a top hat. They were boiled and put in the cowhide bag. As it cooled, the feathers would expand and the hide would shrink, making a compact ball. Due to its superior flight characteristics, the featherie remained the standard ball for more than two centuries. However, an experienced ball maker could only make about two in one day, so they were expensive. A single ball would cost between 2 and 5 sterling, which is the equivalent of $150 and $400 today. Also, it was hard to make a perfectly spherical ball, and because of that, the ball often flew irregularly. When playing in wet weather, the stiches in the ball would rot, and the ball would split open after hitting a hard surface.
In 1848, the Rev. Dr. Robert Adams (or Robert Adam Paterson)[1] invented the gutta-percha ball (or guttie). The gutta was created from dried sap of a Sapodilla Tree. The sap had a rubber-like feel and could be made round by heating and shaping it while hot. Accidentally, it was discovered that defects in the sphere could provide a ball with a truer flight than a pure sphere. Thus, makers started creating intentional defects in the surface to have a more consistent ball flight. Because gutties were cheaper to produce and could be manufactured with textured surfaces to improve their aerodynamic qualities, they replaced feather balls completely within a few years.
In the 20th century, multi-layer balls were developed, first as wound balls consisting of a solid or liquid-filled core wound with a layer of rubber thread and a thin outer shell. This idea was first discovered by Coburn Haskell of Cleveland, Ohio in 1898. Haskell had driven to nearby Akron to keep a golf date with Bertram Work, then superintendent of B.F. Goodrich. While he waited for Work at the plant, Haskell idly wound a long rubber thread into a ball. When he bounced the ball, it flew almost to the ceiling. Work suggested Haskell put a cover on the creation, and that was the birth of the 20th century golf ball. The design allowed manufacturers to fine-tune the length, spin and "feel" characteristics of balls. Wound balls were especially valued for their soft feel.
Today's golf balls have progressed into having cores of titanium compounds, hybrid materials, softer shells and a more pressurized core. They usually consist of a two-, three-, or four-layer design, (named either a two-piece, three-piece, or four-piece ball) consisting of various synthetic materials like surlyn or urethane blends. They come in a great variety of playing characteristics to suit the needs of golfers of different abilities.
Regulations
The diameter of the golf ball cannot be any smaller than 1.680 inches. The maximum velocity of the ball may not exceed 250 feet per second under test conditions and the weight of the ball may not exceed 1.620 ounces.
Aerodynamics
When a golf ball is hit, the impact which lasts less than a millisecond, determines the ball’s velocity, launch angle and spin rate, all of which influence its trajectory (and its behavior when it hits the ground).
A ball moving through air experiences two major aerodynamic forces, lift and drag. Dimpled balls fly farther than non-dimpled balls due to the combination of two effects:
Firstly, the dimples delay separation of the boundary layer from the ball. Early separation, as seen on a smooth sphere, causes significant wake turbulence, the principal cause of drag. The separation delay caused by the dimples therefore reduces this wake turbulence, and hence the drag.
Secondly, backspin generates lift by deforming the airflow around the ball, in a similar manner to an airplane wing. This is called the Magnus effect. Backspin is imparted in almost every shot due to the golf club's loft (i.e. angle between the clubface and a vertical plane). A backspinning ball experiences an upward lift force which makes it fly higher and longer than a ball without spin.[1] Sidespin occurs when the clubface is not aligned perpendicularly to the direction of swing, leading to a lift force that makes the ball curve to one side or the other. Unfortunately the dimples magnify this effect as well as the more desirable upward lift derived from pure backspin. (Some dimple designs are claimed to reduce sidespin effects.)
In order to keep the aerodynamics optimal, the ball needs to be clean. Golfers can wash their balls manually, but there are also mechanical ball washers available.
Design
![](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Two_similar_icosahedron_golf_ball_designs.jpg/450px-Two_similar_icosahedron_golf_ball_designs.jpg)
Most golf balls on sale today have about 300 – 450 dimples. There were a few balls having over 500 dimples before. The record holder was a ball with 1,070 dimples — 414 larger ones (in four different sizes) and 656 pinhead-sized ones. All brands of balls, except one, have even-numbered dimples. The only odd-numbered ball on the market is a ball with 333 dimples, called the Srixon AD333.
Officially sanctioned balls are designed to be as symmetrical as possible. This symmetry is the result of a dispute that stemmed from the Polara, a ball sold in the late 1970s that had six rows of normal dimples on its equator but very shallow dimples elsewhere. This asymmetrical design helped the ball self-adjust its spin-axis during the flight. The USGA refused to sanction it for tournament play and, in 1981, changed the rules to ban aerodynamic asymmetrical balls. Polara's producer sued the USGA and the association paid US$1.375 million in a 1985 out-of-court settlement.
The United States Patent and Trademark Office's patent database is a good source of past dimple designs. Most designs are based on Platonic solids such as icosahedron.
Golf balls come in many different colors, which helps with finding the ball when lost, or in distinguishing one player's ball from another's. White is the most common color.
Hexagonal Dimples
One of the new technological advances in a golf ball is to have hexagonal dimples. This enables the ball to have less drag than a normally dimpled golf ball. The balls have variations on the size of the dimples and some have deeper dimples than others. Callaway Golf is the main supplier of the hexagonal design golf balls, such as the Callaway HX.
Selection
There are many types of golf balls on the market, and customers often face a difficult decision. Golf balls are divided into two categories: recreational and advanced balls. Recreational balls are oriented toward the ordinary golfer, who generally have low swing speeds (80 miles per hour or lower) and lose golf balls on the course easily. These balls are made of two layers, with the cover firmer than the core. Their low compression and side spin reduction characteristics suit the lower swing speeds of average golfers quite well. Furthermore, they generally have lower prices than the advanced balls.
Advanced balls are made of multiple layers (three or more), with a soft cover and firm core. They induce a greater amount of spin from lofted shots (wedges especially), as well as a sensation of softness in the hands in short-range shots. However, these balls require a much greater swing speed that only the physically strong players could carry out to compress at impact. If the compression of a golf ball does not match a golfer's swing speed, either the lack of compression or over-compression will occur, resulting in loss of distance. There are also many brands and colors to choose from, with colored balls and better brands generally being more expensive, making an individual's choice more difficult.
Trick Balls
A number of designs of novelty ball have been introduced over the years, mainly as practical jokes for the amusement of fellow golfers, but also as "cheater" balls that do not conform to the Rules of Golf. All of these are banned in sanctioned games, but can be amusing in informal play:
- Breakaway balls are brittle and hollow, and shatter into many small pieces when hit.
- Exploding balls are similar, but employ a small explosive device that disintegrates the ball when hit. Many courses have banned these as the charge can damage the turf, the player's club or even cause injury, leading manufacturers to develop the breakaway.
- Stallers are far softer than a normal golf ball, allowing them to be compressed far more easily and are given greater backspin when hit. Both of these give the ball a huge amount of lift, making shots climb very high into the air with very little distance travelled over the ground. In the right conditions, such a ball may travel backwards along its flight path or even perform a loop-the-loop.
- Sponge balls are softer still; they are generally used as indoor or backyard practice balls, but some are deceptively similar in appearance to a normal ball. Such a ball will travel less than a quarter of the distance of a normal golf ball.
- Wobblers have a center of mass that is not in the exact center of the ball or is loose within the ball. When putted, the ball will move unpredictably off the intended line.
- Floaters are less dense than a regulation golf ball so when hit into a water hazard, they bob on the surface when a normal ball would sink.
- Super-distance balls have deeper dimples and are heavier than allowed by regulation, which allows them first to maintain momentum and second to maintain a thicker "envelope" of still air around them which reduces turbulence and wind resistance. Marketers of these balls generally advertise a 12-yard gain on most distance shots.
- " phantom balls " disapear in a watery mist when hit.
- " streamer balls " let go of a 15 foot red stream when hit.
Used and refurbished golf balls
Used golf balls are golf balls that have been played, most likely hit into a water hazard, then retrieved, cleaned up and resold. Used golf balls comes in different gradings - one well-accepted standard is:[2]
AAAAA (1st Quality) | AAAA (2nd Quality) | AAA (3rd Quality) | AA (4th Quality) |
Highest quality ball in the marketplace. Like new, perfect to very near perfect. A "One Hit Wonder" Ball. | Very slightly blemished balls. May have minor imperfections. | Slightly scuffed or blemished balls that may have minor discoloration. | Appropriate for range and green practice. Survived a round of golf. |
Refurbished, sometimes called reconditioned or refinished, golf balls are different than used. Refurbished golf balls may look new, but do not meet the manufacturer's original requirements. In the processing procedure, the golf ball is stripped of its original coating and then a new cover/paint in applied. The condition of the ball core may be in question with a refurbished golf ball.
RFID
Recent advances in golf ball technology include placing an RFID transponder in the core of the ball. While only minimally affecting the flight characteristics of the ball, this transponder allows errant balls to be located with a hand-held scanner. RFID technology is also used in some computerized driving ranges. In this format, each ball used at the range has its own unique transponder code. When dispensed, the range registers each dispensed ball to the player, who then hits them towards targets in the range. When the player hits a ball into a target, they receive distance and accuracy information calculated by the computer.
World records
Jason Zuback broke the world ball speed record on an episode of Sports Science with a golf ball speed of 328 km/h (204 mph)[citation needed]. The previous record of 302 km/h (188 mph) was held by José Ramón Areitio, a Jai Alai player[citation needed].
External links
- Golf Ball Dimples - How Many? (written for kids)
- Online golf ball museum with > 1000 different golf balls
- Selecting the best ball that fits you
- Golf ball aerodynamics
- Player performance factors and playing conditions to consider in selecting an appropriate golf ball
- Flight Dynamics of Golf Balls
- Choose the proper golf ball for your game
History
- The evolution of the golf ball
- A history of the golf ball
- Evolution of the Dimpled Golf Ball
- Grading of a Recycled Golf Ball
- All about Golf Balls
- History of the golf ball at The Golf Course
- Learn how golf balls are graded by the worlds most trusted recycled golf ball company
Footnotes
- ^ Sources conflict as to the exact name.