Field of the Invention The present invention generally relates to golf balls, and more particularly to the matching of particular golf balls with specific golf clubs.

Background of the Invention Golf balls generally are designed to be used with a large variety of golf club types. Furthermore, while there are golf balls geared toward amateur players and others geared toward highly skilled players, the variation in ball types is not as great as the actual variation in skill levels of the players. It would be useful to develop and provide a system and method for determining the best ball for use in conjunction with a particular club.

Summary of the Invention An object of the invention is to provide a method and system for selecting a golf ball to be used in conjunction with a particular club.

A further object of the invention is to provide a method and system for maximizing distance and accuracy of driving shots during play.

Yet another object of the invention is a method and system of matching golf balls to commercially available golf clubs.

Yet another object of the invention is to provide a method of characterizing the utility of a particular golf ball which enables a side by side comparison of various golf balls to be made.

Other objects of the invention will become apparent from the remainder of the specification and claims.

The invention in a preferred form is a method of analyzing a plurality of types of golf balls for selecting the type of golf ball best suited for use with a

particular type of golf club, comprising: obtaining a golf club having a club face, obtaining a plurality of golf balls of each of a plurality of different types, striking the golf balls at a first location on the club face using a first set of striking conditions, striking at least a portion of the golf balls at a second location on the club face using a second set of striking conditions, and determining a distance-dispersion rank for at least one type of golf ball, the distance-dispersion rank being a function of at least the following: (a) the travel distance of the golf ball when the ball is struck at the first location on the club face and (b) the accuracy of the golf ball when the ball is struck at the first location and at the second location on the club face. The first and second sets of driving conditions preferably are for"driving"shots, and the club preferably is a driver. The invention also preferably includes the step of determining which type of golf ball has the most favorable distance-dispersion rank.

In a particularly preferred form of the invention, the golf balls are struck using a driving machine. In another form of the invention, the golf balls are struck by golfers.

When a driving machine is used, the first and second sets of launch conditions generally have the same machine setting. In order to strike the golf balls at different locations on the club face, the position of the ball is adjusted in a direction which is generally parallel to the length of the club face when the club face is located at the point of contact with the ball.

The travel distance of the golf balls preferably, but not necessarily, is determined by measuring total distance, including carry and roll of the balls.

In one form of the invention, travel distance is based only on hits off of the center of the club face. In another form of the invention, travel distance is based not only upon hits off of the center of the club face, but also upon hits off of locations toward the heel and/or toe of the club. The accuracy of the golf balls preferably is determined according to the minimum ellipse method, described below.

Yet another preferred form of the invention is a method of analyzing a plurality of types of golf balls for selecting the type of golf ball best suited for use with a particular type of golf club, comprising: obtaining a golf club

having a club face, obtaining a plurality of golf balls of each of a plurality of different types, determining the travel distance of at least one type of ball using a driving machine which is set to a predetermined setting, determining the accuracy of at least one type of ball using a driving machine when the ball is struck from at least two different locations on the club face, and calculating a distance-dispersion rank for at least one type of ball. The distance-dispersion rank preferably is calculated using the following formula: D-D Rank = distance rank plus dispersion rank, wherein the distance rank is the average relative total distance rank in yards for a type of ball compared to the longest ball type, and the dispersion rank is the defference between the square root of the dispersion area of the ball in the test group which has the smallest dispersion area and the square root of the dispersion area of the ball which is being ranked.

A further preferred form of the invention is a method of making a golf ball adapted for use with a particular golf club, comprising maximizing the distance-dispersion ranking of the ball by adjusting one or more of the coefficient of restitution, cover layer hardness, moment of inertia and dimple pattern of the ball, the distance-dispersion ranking being a function of at least (a) travel distance of the ball and (b) the accuracy or dispersion of the ball when it is struck from at least two different locations on the club face.

Preferably, the ball has a hard inner cover layer and an outer cover layer which is softer than the inner cover layer.

Yet another preferred form of the invention is a system for analyzing a plurality of types of golf balls for selecting the type of golf ball best suited for use with a particular type of golf club, comprising: means for striking the golf balls at a first location on the club face using a first set of striking conditions, means for striking at least a portion of the golf balls at a second location on the club face using a second set of striking conditions, and means for determining a distance-dispersion rank for each type of golf ball, the distance-dispersion rank being a function of at least the following: (a) the travel distance of the golf ball when the ball is struck at the first location on the club face, and (b) the

accuracy or dispersion of the golf ball when the ball is struck at the first location and at the second location on the club face.

The present invention accordingly comprises the several steps and the relation of one or more of such steps with respect to each of the others and the system possessing the features, properties and the relation of elements exemplified in the following detailed disclosure.

Brief Description of the Drawings Figs. 1-19 are graphs of distance and accuracy of golf balls in tests conducted in accordance with the examples of the present invention.

Figs. 20-38 are bar graphs showing combined distance and accuracy rankings for the golf balls tested in the examples of the present invention.

Fig. 39 schematically depicts the locations on the face of a golf club driver at which golf balls were hit in accordance with the examples of the present invention.

Detailed Description of The Invention The present invention is directed to a method of designing a golf ball which has synergistic or unexpectedly superior performance when used with a particular golf club. One important step of the method comprises computing the distance-dispersion rank of a variety of golf ball constructions when the balls are driven with a driver of a particular type and selecting the ball with the most favorable distance-dispersion rank.

Accuracy or deviation of a golf ball depends in part upon the gear effect of the club when the ball is not struck at the center of the club face. A ball which is struck off of the toe of a club by a right-handed golfer will hook in a leftward direction. A ball which is struck off of the heel of a club by a right-handed golfer will slice in a rightward direction. Club manufacturers attempt to optimize the gear effect by using an appropriate club face bulge. Too much bulge will result in an insufficient gear effect, while a flat club face will result in too large a gear effect. A soft cover golf ball will generally exhibit a larger gear effect than a hard covered golf ball.

Low spinning golf balls generally have a high moment of inertia. The moment of inertia of a golf ball (also known as its rotational inertia) is the sum of the products formed by multiplying the mass (or sometimes the area) of each element of a figure by the square of its distance from a specified line such as the center of the golf ball. This property is directly related to the radius of gyration of a golf ball, which is the square root of the ratio of the moment of inertia of a golf ball about a given axis to its mass. It has been found that the greater the moment of inertia (or the farther the radius of gyration is from the center of the ball) the lower the spin rate is for the ball.

To practice the matching method of the invention, a golf club is obtained for which matching is sought. The golf club is then tested using a variety of balls either in live player tests or using a driving machine. If a driving machine is used, it preferably is set up to replicate average live player swing conditions. Tests conducted by the assignee of the present application found that amateur golfers typically hit with a launch angle for the ball of 11.2 i 2.3°, a ball speed of 125 15 feet per second, and an initial spin rate of 3690 * 1020 revs. per minute. The January 1998 issue of Golf Digest reported an average launch angle of 12°, a ball speed of 128 feet per second, and a spin rate of 3700 revs. per min. In a particularly preferred form of the invention, each of the balls is struck at the center of the club face, and then at 0.5-0.75 inches toward the heel and 0.5-0.75 inches toward the toe.

When the golf ball is struck from various points on the club, the forward/backward position of the ball relative to the club generally is not changed. However, the position of the tee and ball is shifted laterally relative to the position of the club face at the point of impact with the ball.

In a particularly preferred form of the invention, a distance-dispersion rank for a golf ball is determined by adding a distance rank and a dispersion rank. This method has been determined to be most advantageous in actually depicting or reflecting the facts on the field or the advantages of combined distance and accuracy tests, as would be observed by test personnel in the field.

In one preferred form of the invention, the distance rank is the average relative total distance rank in yards for a type of ball compared to the longest ball type,

and the dispersion rank is the difference between the square root of the dispersion area of the ball in the test group which has the smallest dispersion area and the square root of the dispersion area of the ball which is being ranked.

Other methods of computing a distance-dispersion rank are contemplated which take into account, for example, the carry distance, with or without the rolling distance of the golf ball, and the angular degree of deviation of the shots. A number of suitable indices or rankings can be used.

The method and system of the invention are particularly well suited for use with golf club drivers, but also can be used with irons.

Example 1 A number of golf balls having the formulations shown below on Tables A and B (1.68" System T balls) were formed. A number of golf balls having the formulations shown below on Tables C and D (1.71" System C balls) also were formed. The balls having the formulations of Tables A and B had the same 422 tri dimple pattern as the 1997 Top-Flite (D Strata Tour golf ball.

The balls having the formulations of Tables C and D had the 422 tri dimple pattern with different dimple depths than the 1997 Top-FliteX) Strata Tour golf ball. The dimple depths for the balls of Tables C and D were 0.0105" for the 0.144" diameter dimples, 0.01207" for the 0.156" diameter dimples, and 0.0127" for the 0. 168" diameter dimples.

Example 2 A number of golf balls were prepared having the core and cover formulations shown below in Tables A-D except that the ionomer used in the mantle layer was: 50 parts by weight Iotek 1002 and 50 parts by weight Iotek 1003. The Shore D hardness of the mantles was 70.

TABLE A Core Formulation Ingrediantspph Cariflex1220 70 30Taktene220 ZincOxide 25 TGregrind0 ZincStéarate20 ZDA19.@ 0.2ColorMB 231XL09 Data Diameter 1.47" <BR> <BR> Weight 31. 5g S. G. (spec. gravity) 1.16 Compression125/35 COR (coeff. of restitution) 775 77/42ShoreC/D Mantie Formulation %N+% CationPPHIngrediantsType 18%AA31%Na75lotek1002 817215%MA?%Mg25SurlynAD ------19.0BronzePowder Titanium---0.1--- Data Diameter 1. 57" Thickness0.050" Weight38 3g S. G. mantle 1. 12 Compression95/65 COR 800 Shore97/70 Final Ball Formulation %%N++ Inarediants Type Cation PPH 15%MA30%Na17Surlyn8940 15%MA59%Zn50.1Surlyn9910 #7%MA?%Na7.7Surlyn8120 #7%MA?%Na17.9Surlyn8320 lotekAA25%Zn7.315% Whitener2.37#1 Data Mom. 4456inertia <BR> <BR> Daimeter 1.68"<BR> Cover Thickness 0.055" Weight 45. 5g S. G. cover 0.98 Compression 80/80<BR> <BR> <BR> <BR> <BR> <BR> COR 800<BR> Shore C/D 93/62 '1 > Whitener package contains a blend ot titaniurh dloxlda, Eastobrite OB-1 optteaLcngntenef.

Ultra marine blue pigment and Santonox R antloxldant TABLEB Core Fomulation Ingrediantspph Cariflex1220 70 Taktene 220 30 Zinc Oxide 25 0TGregrind 20ZincStearate ZDA19.5 0.2ColorMB 0.9231XL Data Diameter1.47" <BR> <BR> <BR> Weight 31. 5g S.G. 1.16 Compression125 <BR> <BR> COR 775 Shore C/D 77/42 Mantle Formulation % Acid+% N+ CationPPHIngrediantsType lotek 1002 18% AA 31% Na 35 Surl n 6120 19% MA? % Ma 65 Bronze---19.0--- Titanium---0.1--- Data <BR> <BR> Flex Modulus (weighted avg) 470 Mpa Diameter 1.57" Weight 38.3g S. G. mantel 1.12 +/- 0. 05 Compression (Riehle/PGA) 93/67 COR 802 Shore C/D 97/71 Stiffness Modulus 3521 Kgf/cm2 Final Ball Permutation % Acid + % N + Inarediants Type Cation PPH SurlynSurlyn8940 15% Na1730% Surlyn 9910 15% MA 59% Zn 50.1 #7%MA?%Na7.7Surlyn8120 Surlyn 8320 # 7% MA ? % Na 17.9 lotek 7030 15% AA 25% Zn 7. 3 Whitener Package e *1 2. 37 Data Flex Modulus (weighted avg) 240 MPa Diameter 1.68" Cover Thickness 0.055" Weight 45.5 g S. G. cover 0.98 Compression (Riehle/PGA) 79/81 COR 801 Shore C/D 93/62 Mom of Infertia 0. 4456 *1 > Whitener package contains a blend of titanium dioxide, Eastobrite OB-1 optical brightener, Ultra marine blue pigment and Santonox R antioxidant TABLE C Core Formulation Ingrediantspph Cariflex1220 70 Taktene220 30 ZincOxide 10 TG reghnd 0 20ZincStearate 20.5ZincDiacrylate 0.2ColorMB peroxide0.9231XL Data Diameter1.50" Weight31.2g S.G. (spec. gravity) 1.078 Compression (Riehle/PGA) 125/35 COR (coeff. of restitution) 775 Shore C/D 75/40 Mantle Formulation +%N+%Acid CationPPHIngrediantsType lotek 1002 18 % AA 31% Na 75 817215%MA?%Mg25SurlynAD Bronze Powder--19.0 Titanium-- Data Ciameter 1.60" Thickness 0. 050" Weight 38. 5g S. G. manUe1.12 Compression (Riehle/PGA) 101/59 COR 800 Shore 97/70 Final Ball Formulation % Acid+% N+ CationPPHIngrediantsType 15%MA30%Na17Surlyn8940 15%MA59%Zn50.1Surlyn9910 Suri 8120-7% MA? % Na 7.7 Surlyn 8320 # 7% MA ? % Na 17.9 15%AA25%Zn7.3lotek7030 Whitener Pacage'1 2.37 Data Mom.of inertia 4684 Diameter 1.71" Cover Thickness 0.055" <BR> <BR> gWeight45.5 <BR> <BR> <BR> 0.98S.G.cover <BR> <BR> <BR> <BR> Compression (Riehle/PGA) 8018Q _COR 808 Shore 93/62 @1 > Whitener package contains a blend of titanium dioxide, Eastobrite OB-1 optical brightener, Ultra marine andSantonoxRantioxidantplgment TABLE D Core Permutation Ingrediantspph 70Cariflex1220 Taktene 220 30 Zinc Oxide 10 TG0 ZincStearate 20 ZDA 20.5 Color MB 0.2 0.9231XL Data<BR> <BR> <BR> <BR> <BR> Diameter1. 50"<BR> <BR> <BR> <BR> <BR> Weight 31. 2g S.G.1.078 Compression125 <BR> <BR> COR 775 Shore C/D 75/40 Mantle Permutation %Acid + % N + Ingrediants Type Cation PPH lotek 1002 18 % AA 31% Na 35 19%MA?%Mg65Surlyn6120 BronzePowder-----19. 0 TitaniumDioxide------0. 11 Data (weightegavg)470MpaFlexModulus Diameter 1.60" <BR> <BR> Thickness 0.050"<BR> <BR> <BR> Weight 38. 5g 1.12+/-0.05S.G.mantle Compression 93/67 COR 802 Shore C/D 97/71 Stiffness Modulus 3521 Kgf/cm2 Final Ball Formulation % Acid + % N + CationPPHIngrediantsType 15%MA30%Na17Surlyn8940 15%MA59%Zn50.1Surlyn9910 Surlyn 8120 # 7% MA? % Na 7.7 Surlyn 8320 # 7% MA? % Na 17.9 lotek AA25%Zn7.315% Whitener 2.37*1 Data avg)240MPaModulus(weighted Diameter1.71" CoverThickness 0.055" <BR> <BR> <BR> Weight 45.5 g S. G. cover 0.98 Compression 79/81 <BR> <BR> COR 809 ShoreC/D 93/62 Mom. of Intertia 0. 4684 *1 > Whitener package contains a blend of titanium dioxide, Eastobrite OB-1 optical brightener, Ultra marine blue pigment and Santonox R antioxidant

Example 3 A number of player tests were conducted using amateur golfers, 1997 Great Big Bertha@ drivers (CallawayX Golf) and 1997 Top-flirte Z-BalataX golf balls (Spalding Sports Worldwide). The average launch angle, ball speed and spin rate of these players was computed. A True Temper driving machine was set up with a Great Big Bertha@ golf driver inserted therein and the club and machine were adjusted such that a 1997 Top-FliteX Z-BalataNE) golf ball had the following launch conditions when the ball was struck at the center of the club: launch angle: 11.3°, ball speed: 211 feet per second, and ball spin rate: 3950 revs/min.

A number of distance and accuracy measurements were made using the Great Big Bertha@ driver in the driving machine, as well as a number of other commercially available drivers. 8-10 different types of golf balls were tested using each driver. Data collected included total distance of the ball, including carry and roll, when the ball was hit from the center of the club face, 0.75 inches toward the heel from the center, and 0.75 inches toward the toe from the center (see Fig. 2). For the King Cobra Ti club, heel and toe shots were made 0.50 inches toward the heel and toe, as this club has an unfavorable gear effect. All clubs were right handed clubs, had regular shaft flex, and had 9-10.5 degrees of loft. The distance and deviation (accuracy) results are shown below on Tables 1-9. On tables I-9,"Total Distance Average"is based on carry plus roll for combined center, toe and heel hits."Distance Rank"is the relative total distance rank. The longest ball is given a value of zero. All other ball types are ranked according to the number of yards short of the longest ball.

Thus,"Distance Rank"equals"Total Average Distance"minus the largest number in the"Total Average Distance"column for a given set of test data.

"Dispersion Area"is the minimum elliptical area which encloses 95% of the landing pattern data. The landing pattern data is based on carry but not roll of the balls. The landing pattern includes center toe and heel shots. The minimum ellipse, which can be tilted relative to the X and Y axes, is calculated using a computer program which will best-fit an ellipse to a given collection of ball landing coordinates. While the inventors used a custom designed program,

such programs are commercially available under the name"Statistica". The ellipse includes 95% of the data, thereby eliminating erratic data points.

"Dispersion Rank"is the relative dispersion rank. This is the square root of the"Dispersion Area". The square root is taken to make all units consistent in yards. The smallest length is given a ranking of zero. All other ball types are ranked according to the number of yards by which they exceed the smallest value.

"Combined Rank"is the combined distance and dispersion rank, i. e. the sum of"Distance Rank"and"Dispersion Rank". The closer the ranking is to zero, the better the combined distance and dispersion is for the type of ball that was tested.

On Tables 1-9,"System C"is the ball of Tables C and D, and the 1.71"ball of Example 2."System T"is the ball of Tables A and B, and the 1.68" ball of Example 2. The early tests used the balls of Example 2. Later tets used the balls of Example 1. As is shown on Tables 1-9 the System C and System T balls had better combined rankings than the balls of other manufacturers.

Definitions Compression-PGA compression is another important property involved in the performance of a golf ball. The compression of the ball can affect the playability of the ball on striking and the sound or"click"produced.

Similarly, compression can effect the"feel"of the ball (i. e., hard or soft responsive feel), particularly in chipping and putting.

Moreover, while compression itself has little bearing on the distance performance of a ball, compression can affect the playability of the ball on striking. The degree of compression of a ball against the club face and the softness of the cover strongly influences the resultant spin rate. Typically, a softer cover will produce a higher spin rate than a harder cover. Additionally, a harder core will produce a higher spin rate than a softer core. This is because at impact a hard core serves to compress the cover of the ball against the face of the club to a much greater degree than a soft core thereby resulting in more

"grab"of the ball on the clubface and subsequent higher spin rates. In effect the cover is squeezed between the relatively incompressible core and clubhead.

When a softer core is used, the cover is under much less compressive stress than when a harder core is used and therefore does not contact the clubface as intimately. This results in lower spin rates.

The term"compression"utilized in the golf ball trade generally defines the overall deflection that a golf ball undergoes when subjected to a compressive load. For example, PGA compression indicates the amount of change in golf ball's shape upon striking. The development of solid core technology in two-piece balls has allowed for much more precise control of compression in comparison to thread wound three-piece balls. This is because in the manufacture of solid core balls, the amount of deflection or deformation is precisely controlled by the chemical formula used in making the cores. This differs from wound three-piece balls wherein compression is controlled in part by the winding process of the elastic thread. Thus, two-piece and multilayer solid core balls exhibit much more consistent compression readings than balls having wound cores such as the thread wound three-piece balls.

In the past, PGA compression related to a scale of from 0 to 200 given to a golf ball. The lower the PGA compression value, the softer the feel of the ball upon striking. In practice, tournament quality balls have compression ratings around 70-110, preferably around 80 to 100.

In determining PGA compression using the 0-200 scale, a standard force is applied to the external surface of the ball. A ball which exhibits no deflection (0.0 inches in deflection) is rated 200 and a ball which deflects 2/lOth of an inch (0.2 inches) is rated 0. Every change of. 001 of an inch in deflection represents a 1 point drop in compression. Consequently, a ball which deflects 0.1 inches (100 x. 001 inches) has a PGA compression value of 100 (i. e., 200-100) and a ball which deflects 0.110 inches (110 x. 001 inches) has a PGA compression of 90 (i. e., 200-110).

In order to assist in the determination of compression, several devices have been employed by the industry. For example, PGA compression is determined by an apparatus fashioned in the form of a small press with an

upper and lower anvil. The upper anvil is at rest against a 200-pound die spring, and the lower anvil is movable through 0.300 inches by means of a crank mechanism. In its open position the gap between the anvils is 1.780 inches allowing a clearance of 0.100 inches for insertion of the ball. As the lower anvil is raised by the crank, it compresses the ball against the upper anvil, such compression occurring during the last 0.200 inches of stroke of the lower anvil, the ball then loading the upper anvil which in turn loads the spring. The equilibrium point of the upper anvil is measured by a dial micrometer if the anvil is deflected by the ball more than 0.100 inches (less deflection is simply regarded as zero compression) and the reading on the micrometer dial is referred to as the compression of the ball. In practice, tournament quality balls have compression ratings around 80 to 100 which means that the upper anvil was deflected a total of 0.120 to 0.100 inches.

An example to determine PGA compression can be shown by utilizing a golf ball compression tester produced by Atti Engineering Corporation of Newark, N. J. The value obtained by this tester relates to an arbitrary value expressed by a number which may range from 0 to 100, although a value of 200 can be measured as indicated by two revolutions of the dial indicator on the apparatus. The value obtained defines the deflection that a golf ball undergoes when subjected to compressive loading. The Atti test apparatus consists of a lower movable platform and an upper movable spring-loaded anvil. The dial indicator is mounted such that it measures the upward movement of the springloaded anvil. The golf ball to be tested is placed in the lower platform, which is then raised a fixed distance. The upper portion of the golf ball comes in contact with and exerts a pressure on the springloaded anvil.

Depending upon the distance of the golf ball to be compressed, the upper anvil is forced upward against the spring.

Alternative devices have also been employed to determine compression. For example, Applicant also utilizes a modified Riehle Compression Machine originally produced by Riehle Bros. Testing Machine Company, Phil., PA to evaluate compression of the various components (i. e., cores, mantle cover balls, finished balls, etc.) of the golf balls. The Riehle

compression device determines deformation in thousandths of an inch under a fixed initialized load of 200 pounds. Using such a device, a Riehle compression of 61 corresponds to a deflection under load of 0.061 inches.

Additionally, an approximate relationship between Riehle compression and PGA compression exists for balls of the same size. It has been determined by Applicant that Riehle compression corresponds to PGA compression by the general formula PGA compression = 160-Riehle compression. Consequently, 80 Riehle compression corresponds to 80 PGA compression, 70 Riehle compression corresponds to 90 PGA compression, and 60 Riehle compression corresponds to 100 PGA compression. For reporting purposes, Applicant's compression values are usually measured as Riehle compression and converted to PGA compression. Furthermore, additional compression devices may also be utilized to monitor golf ball compression so long as the correlation to PGA compression is know. These devices have been designed, such as a Whitney Tester, to correlate or correspond to PGA compression through a set relationship or formula.

Coefficient of Restitution-Golf balls are typically described in terms of their size, weight, composition, dimple pattern, compression, hardness, durability, spin rate, and coefficient of restitution (COR). One way to measure the COR of a golf ball is to propel the ball at a given speed against a hard massive surface, and to measure its incoming and outgoing velocity. The COR is the ratio of the outgoing velocity to the incoming velocity and is expressed as a decimal between zero and one.

There is no United States Golf Association limit on the COR of a golf ball but the initial velocity of the golf ball must not exceed 250 5 ft/second.

As a result, the industry goal for initial velocity is 255 ft/second, and the industry strives to maximize the COR without violating this limit.

The resilience or coefficient of restitution (COR) of a golf ball is the constant"e,"which is the ratio of the relative velocity of an elastic sphere after direct impact to that before impact. As a result, the COR ("e") can vary from 0 to 1, with 1 being equivalent to a perfectly or completely elastic collision and 0 being equivalent to a perfectly or completely inelastic collision.

COR, along with additional factors such as club head speed, club head mass, ball weight, ball size and density, spin rate, angle of trajectory and surface configuration (i. e., dimple pattern and area of dimple coverage) as well as environmental conditions (e. g. temperature, moisture, atmospheric pressure, wind, etc.) generally determine the distance a ball will travel when hit. Along this line, the distance a golf ball will travel under controlled environmental conditions is a function of the speed and mass of the club and size, density and resilience (COR) of the ball and other factors. The initial velocity of the club, the mass of the club and the angle of the ball's departure are essentially provided by the golfer upon striking. Since club head, club head mass, the angle of trajectory and environmental conditions are not determinants controllable by golf ball producers and the ball size and weight are set by the U. S. G. A., these are not factors of concern among golf ball manufacturers. The factors or determinants of interest with respect to improved distance are generally the coefficient of restitution (COR) and the surface configuration (dimple pattern, ratio of land area to dimple area, etc.) of the ball.

The COR in solid core balls is a function of the composition of the molded core and of the cover. The molded core and/or cover may be comprised of one or more layers such as in multi-layered balls. In balls containing a wound core (i. e., balls comprising a liquid or solid center, elastic windings, and a cover), the coefficient of restitution is a function of not only the composition of the center and cover, but also the composition and tension of the elastomeric windings. As in the solid core balls, the center and cover of a wound core ball may also consist of one or more layers.

The coefficient of restitution is the ratio of the outgoing velocity to the incoming velocity. In the examples of this application, the coefficient of restitution of a golf ball was measured by propelling a ball horizontally at a speed of 125 5 feet per second (fps) and corrected to 125 fps against a generally vertical, hard, flat steel plate and measuring the ball's incoming and outgoing velocity electronically. Speeds were measured with a pair of Oehler Mark 55 ballistic screens available from Oehler Research, Inc., P. O. Box 9135, Austin, Texas 78766, which provide a timing pulse when an object passes

through them. The screens were separated by 36"and are located 25.25" and 61.25" from the rebound wall. The ball speed was measured by timing the pulses from screen 1 to screen 2 on the way into the rebound wall (as the average speed of the ball over 36"), and then the exit speed was timed from screen 2 to screen 1 over the same distance. The rebound wall was tilted 2 degrees from a vertical plane to allow the ball to rebound slightly downward in order to miss the edge of the cannon that fired it. The rebound wall is solid steel 2.0 inches thick.

As indicated above, the incoming speed should be 125 5 fps but corrected to 125 fps. The correlation between COR and forward or incoming speed has been studied and a correction has been made over the 5 fps range so that the COR is reported as if the ball had an incoming speed of exactly 125.0 fps.

The coefficient of restitution must be carefully controlled in all commercial golf balls if the ball is to be within the specifications regulated by the United States Golf Association (U. S. G. A.). As mentioned to some degree above, the U. S. G. A. standards indicate that a"regulation"ball cannot have an initial velocity exceeding 255 feet per second in an atmosphere of 75 F. when tested on a U. S. G. A. machine. Since the coefficient of restitution of a ball is related to the ball's initial velocity, it is highly desirable to produce a ball having sufficiently high coefficient of restitution to closely approach the U. S. G. A. limit on initial velocity, while having an ample degree of softness (i. e., hardness) to produce enhanced playability (i. e., spin, etc.).

Shore D hardness-As used herein,"Shore D hardness"of a cover is measured generally in accordance with ASTM D-2240, except the measurements are made on the curved surface of a molded cover, rather than on a plaque. Furthermore, the Shore D hardness of the cover is measured while the cover remains over the core. When a hardness measurement is made on a dimpled cover, Shore D hardness is measured at a land area of the dimpled cover.

Table 1 Big Bertha Warbird 10.0 R-Flex Spin=11.2,Speed=212,Spin=3690 01139806 Minimum Ellipse method Carry Distance (yds) Total Distance (yds) Distance Carry Deviation (yds) Total Distance/ Dispersion Combined Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Dispersion Dispersion Rank Rank (yd^2) (yds) (yds) Club System T 238.4 3.6 248.3 4.5 0.0 5.0 7.2 392.3 Hot XL Tour 238.0 3.2 245.4 3.9 -2.9 5.7 9.4 439.2 Club System C 234.4 3.4 244.1 4.7 -4.2 5.0 7.9 438.8 Revolution 90 236.4 3.9 244.0 4.6 -4.3 5.8 8.0 447.1 Tour Distance 90 236.7 3.6 246.5 4.5 -1.8 6.0 11.5 624.7 EV Extra Spin 234.2 2.9 241.6 4.8 -6.7 6.4 9.9 575.4 DT Wound 90 234.6 3.4 241.9 5.4 -6.4 7.1 11.0 617.3 HP2 Tour 229.2 2.9 239.1 4.7 -9.2 5.4 9.9 572.9 Professional 90 231.7 3.1 237.9 4.0 -10.4 6.9 10.8 529.8 Tour Batata 90 231.5 2.8 238.3 4.3 -10.0 7.0 9.5 577.1 Big Bertha Warbird 10.0 R-Flex Angle=10.4 Speed=210.9,Spin=3425 0318983c Mir Carry Distance (yds) Total Distance (yds) Distance Carry Deviation (yds) Total Dis Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Dispersion Dis (yd^2) System C New Prod 225.2 4.0 248.0 6.8 0.0 3.3 7.5 593.3 System T 225.6 4.2 245.6 7.4 -2.4 2.9 7.7 684.0 System C Current Prod 225.3 4.3 245.9 6.5 -2.1 3.4 8.8 711.3 Professional 90 221.5 4.9 245.3 7.1 -2.7 2.1 8.0 683.8 HP2 Tour New 227.2 4.1 244.2 5.7 -3.8 4.0 10.4 737.7 Revolution 100 224.7 4.9 245.3 8.2 -2.7 2.5 8.4 834.4 EV Extra Spin 225.0 5.3 242.8 7.9 -5.2 3.0 7.6 704.9 Tour Distance 90 225.1 4.4 245.2 7.5 -2.8 3.5 9.9 891.3 HP2 Tour Old 225.9 6.2 244.3 8.2 -3.7 3.4 9.0 894.4 Tour Batata 90 218.8 4.5 242.2 7.2 -5.8 3.0 9.3 824.9 DT Wound 90 223.7 4.3 241.0 7.6 -7.0 3.4 9.3 852.1 Table 2 Great Big Bertha 9.0 R@Flex Angle=11 3,Speed=211,Spin=3950 1210971c @Minimum Ellipse method Carry Distance (yds) Total Distance (yds) Distance Carry Deviation (yds) Total Distance/ Dispersion Combined Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std Dev. Dispersion Dispersion Rank Rank (yd^2) (yds) (yds) Club System T 232.0 4.9 236.3 4 7 0 0 -2 1 13 1 692 7 8 98 -1 0 -1 0 Club System C 230.8 4 9 234.8 4 0 -1 5 - 2 8 13 4 694 0 8 9 1 -1 0 -2 5 DT Wound 90 229.3 4 5 232 2 4 1 -4 1 -1 0 16 5 647 4 9 13 -0 1 -4 2 Tour Distance 90 231.8 5 3 235.8 6 1 -0 5 -3 2 17.0 846.7 8 10 -3 8 -4 3 HP2 Tour 226.4 4.9 231.5 4.2 -4.8 -3 5 14 6 640.2 9 15 0 0 -4 8 EV Extra Spin 227.4 5.4 230.3 5.2 -6.0 -1.1 14.6 682.5 8 81 -0 8 -5 8 Professional 90 226.3 4.9 230.0 5.1 -6.3 -0.9 16 1 670 0 8 89 -0 6 -6 9 Tour Batata 90 224.9 4.3 228.9 3.8 -7 4 -0.2 15.0 725.0 8 50 -1 6 -0 0 Great Big Bertha 9.0 R-Flex Angle=11 7 Speed=209,Spin-3924 01279804 Minimum Ellipse method Carry Distance (yds) Total Distance (yds) Distance Carry Devration (yds) Total Distance/ Dispersion Combined Ball Type Average Std.Dev Average Std.Dev. Rank Average Std.Dev. Dispersion Dispersion Rank Rank (yd^2) (yds) (yds) Staft Ti Spin 90 221.9 7.3 224.5 7.5 0.0 -2.1 10 1 923 0 7.39 0.0 0 0 Maxf@ XS Tour 90 220.6 7.1 223.3 6.7 -1.2 0.5 11 0 925.6 7.34 -0.0 -1 2 Maxf@ HT 90 218.8 5.1 222.1 4.9 -2.4 0.0 11 8 929.2 7.29 -0.1 -2 5 System C 220.5 7.5 223.5 7.4 -1.0 2.4 11.0 1032.3 6.96 -1 7 -2 7 Revolution 90 219.8 6.9 222.2 7.1 -2.3 -0.6 11 4 959.5 7 17 -0 6 -2 9 Staft Batata Ti 90 220.4 7.2 223.7 7.2 -0 8 -1.1 13.2 1169.3 6.54 -3 8 -4.6 Srtxon MI Brid 217.8 8.2 219.8 8.5 -4.7 0.1 12.5 1285.1 6 13 -5 5 -10.2 Duntop Mag. Spin 215.8 8.8 216.9 9.0 -7.6 0.0 11.4 1237.4 6 17 -4 8 -12 4 Maxf@ RM 100 218.2 8.5 220.3 9 0 -4.2 1 4 13 3 1561 3 5 58 -9 1 -13 3 Great Big Bertha 9.0 R-Flex Angle=11 8,Speed=189,Spin=3856 0129981c Minimum Ellipse method 0129981c Carry Distance (yds) total Distance (yds) Distance Carry Devration (yds) Total distance/ Dispersion Combined Ball Type Average Std.Dev Average Std.Dev. Rank Average Std Dev. Dispersion Dispersion Rank Rank (yd^2) (yds) (yds) Club System C 192.7 3.8 199.3 3 9 -7.2 3.8 9 4 435.3 9.55 -3.1 -10 3 Hot XL Tour 188.0 3.5 192.5 4 1 -14.0 3.9 6.0 316.6 10.82 0 0 -14.0 Srtxon HI Brid 188.0 3.5 192.5 4 1 -14.0 3.9 6.0 316.6 10.82 0 0 -14.0 Staff Batata Ti 90 189.2 4.3 195.5 5.1 -11.0 0.8 8.4 480.1 8.92 -4.1 -15.1 HP2 Tour 189.2 3.3 195.8 5.5 -10 7 2.8 8.9 516.3 8 62 -4.9 -15.6 Revolution 90 188.7 3.9 194.6 4.6 -11.9 4.0 7.9 473.1 8.95 -4.0 -15 9 Maxf@ HT 90 187.1 3.4 195.0 5.0 -11.5 3.7 9.1 524.7 8.51 -5 1 -16.6 Maxf@ XS Tour 90 189.8 4.6 195.7 5.3 -10.8 4.8 8.2 566.7 8.22 -6 0 -18.8 EV Extra Spin 187.3 3.5 191.5 3.9 -15.0 4.4 8 1 401.6 9.56 -2 2 -17 2 Staff Ti Spin 90 190.7 4.5 196.7 5 3 -9.8 2 1 10 1 938 6 7.78 -7 5 -17 3 Maxf@ RM 100 186.4 5.1 192.4 5.0 -14 1 4.9 7 8 471.3 8 86 -3 9 -18.0 Tour Distance 90 190.0 5.7 196.9 6 4 -9.6 4.8 9.5 736 4 7 26 -9 3 -18.9 Tour Batata 90 188.5 3.1 192.5 4.2 -14.0 3 0 10.7 531.0 8 35 -5 3 -19.3 Professional 90 184.7 3.9 189.6 4.5 -16.9 5.8 7 7 424 6 9 20 -2 6 -19 7 Duntop Mag. Spin 186.6 4.6 190.5 4.7 -16 0 4.3 8.4 492.8 8.58 -4 4 -20 4 DT Wound 90 192.9 4.7 1999.9 6.2 -6.6 4.4 13.8 1037.0 6 21 -14.4 -21.0 Table 3 Great Big Bertha 9.0 R-Flex Angle=11.8,Speed=209,Spin=3943 01299807 Minimum Ellipse method Carry Distance (yds) Total Distance (yds) Distance Carry Deviation (yds) Total Distance/ Dispersion Combined Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Dispersion Dispersion Rank Rank (yd^2) (yds) (yds) Club System C 227.1 3.7 232.9 3.8 0.0 -4.4 12.1 540.5 10.02 -1 0 -1.0 Maxf@ XS Tour 90 224.7 3.5 229.8 3.5 -3.1 -4 5 11 6 495.9 10.32 0 0 -3.1 Revolution 90 225.4 4.0 230.9 5.2 -2.0 -5.6 10.1 560.1 9.76 -1 4 -3.4 Staff Batata Ti 90 224.5 5.2 230.8 5.2 -2.1 -5.3 10 4 666.5 8.94 -3.5 -5 6 Staff Ti Spin 90 226.6 4.5 232.1 4.9 -0.8 -7.2 12.2 785.6 8.28 -5 8 -6.6 Srtxon HI Brid 223.7 4.6 228.4 5.0 -4.5 -4.1 9 7 638.3 9.04 -3.0 -7.5 Maxf@ HT 90 224.6 6.4 230.5 6.1 -2.4 -5.3 11.5 883.2 7.76 -7.4 -9.8 Maxf@ RM 100 223.0 6.4 228.5 6.7 -4.4 -4.9 10.3 827.6 7.94 -6.5 -10.9 Duntop Mag. Spin 222.9 5.0 226.8 4.6 -6.1 -3 8 12.0 732.8 8.38 -4.8 -10.9 Great Big Bertha 9.0 R-Flex Angle=11.6,Speed=207,Spin=3742 0206983c Minimum Ellipse method Carry Distance (yds) Total Distance (yds) Distance Carry Deviation (yds) total Distance/ Dispersion Combined Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Dispersion Dispersion Rank Rank (yd^2) (yds) (yds) Soft Metal 220.9 4.7 226.1 4 7 0 0 -3.0 13 1 741.7 8 30 -2 7 -2 7 Club System C 218.1 6.7 222.9 6.8 -3.2 -4.6 7 6 600.7 9 09 0.0 -3.2 HP2 Distance 219.7 4.7 225.1 4.6 -1.0 -4.6 14 5 806.3 7.93 -3 9 -4.9 Club System C (12/97) 217.1 5.7 221.6 5.4 -4.5 -4.1 9.7 621.7 8.89 -4 4 -4.9 Staff Ti Spin 90 216.2 6.7 221.1 7.0 -5.0 -4.9 8 6 737.8 8 14 -2 7 -7.7 Staff Batata Ti 90 214.3 6.4 218.7 7.2 -7 4 -7.5 7.4 643.5 8.62 -0.9 -8.3 Maxf@ XS Tour 90 214.8 6.3 219.1 6.5 -7.0 -4.3 6.6 671.5 8 46 -1 4 -8 4 Revolution 90 213.4 5.9 218.1 6.6 -8.0 -5.8 8.1 642.7 8.60 -0 8 -8 8 Srtxon Hi Brid 212.6 6.4 216.2 6.8 -9.9 -7.1 7.5 614 9 8.72 -0 3 -10 2 Maxf@ RM 100 211.7 7.0 215.6 6.9 -10 5 -5.1 7.5 627.7 8 61 -0 5 -11.0 Maxf@ HT 90 211.0 6.4 216.6 7.2 -9.5 -6.7 8.5 752.1 7.90 -2 9 -12.4 Great Big Bertha 9.0 R-Flex Angle=11.y,Speed=205.6,Spin=3785 0317985c Minimum Ellipse method Carry Distance (yds) Total Distance (yds) Distance Carry Devlation (yds) Tocal Distance/ Uispersion Combined Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Dispersion Dispersion Rank Rank (yd^2) (yds) (yds) System C New Prod 234.6 5.1 245.4 6.2 -2 4 -0.3 10 1 793 9 8 71 0 0 -2.4 System C Current Pro 234.3 4.8 246.6 7 0 -1 2 1.2 10 6 892.0 8.26 -1 7 -2 9 Staff Ti Distance 237.0 6.1 246.1 5.7 -1 7 2 6 11.8 961.0 7 94 -2 8 -4 5 Maxf@ XS Distance 236.7 4.9 243.9 6.1 -3.9 3.9 12.2 911.7 8.08 -2 0 -5.9 Magne Distance 100 232.3 5.0 241.5 6.2 -6.3 3.3 11.3 898.5 8.06 -1 8 -8 1 EV Extra Distnace 236.1 5.7 245.5 7.2 -2.3 2 5 12.3 1206.2 7.07 -6.6 -8 9 DT 2-Piece 237.1 6.1 247.8 7.6 0.0 1.3 13.6 1459 0 6 49 -10 0 -10 0 Table 4 Great Big Bertha 10.0 R-Flex Note: Machine not running good Angl=10 9,Speed=210.@,Spin=4200 variable chib speed. Otd Samplet 04029805 Minimum Ellipse method Carry Distance (yds) Total Distance (yds) Distance Carry Devalation (yds) Total Distance Dispersion Combined Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Dispersion Dispersion Rank Rank (yd^2) (yds) (yds) Revolution 100 234.5 8.2 244.9 7.4 -4.5 0 9 12 0 1060.6 7.52 -2.5 -7 0 Professional 100 233.9 7.6 243.8 6.7 -5 6 1.9 11.4 1000 0 7.71 1.6 -7.2 Staz. Raw Distance 239.1 8.1 249.4 7.5 0.0 2.4 16.7 1417 2 6.62 -7 6 -7.6 Strata Tour 100 230.9 7.7 241.7 7.5 -7.7 -0.8 9.9 901 7 8.05 0 0 -7 7 System C (1/98) 233.0 7.5 248.5 7.2 -0 9 1.4 15 7 1502 8 6 41 -8 7 -9 6 Staz. Power Control 137.8 8.0 249 3 7 4 -0 1 2 1 17 6 1583 0 6 27 -9 8 -9 9 Strata Advance 100 230.4 7.8 242.5 7.1 -6.9 1.5 12.9 1151.6 7.15 -3 9 -10.8 Tour Batata 100 231.5 7.2 240.9 6.8 -8.5 2.7 13.7 1089.7 7.30 -3.0 -11 5 Staz. Batata 100 233.7 8.4 244.0 9.2 -5.4 3.0 11.9 1358.7 6.62 -6 8 -12.2 Staz. Tour Ca@bre 233.4 9.2 244.1 8.7 -5.3 2.9 15.2 1627.7 6.05 -10.3 -15.6 Great Big Bertha 9.0 R-Flex Note: Machine not running good Angle=11.4,Speed=204.7,Spin=3835 vartable club speed 04039802 Minimum Ellipse method Carry Distance (yds) Total Distance (yds) Distance Carry Devlation (yds) Total Distance/ Dispersion Combined Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Dispersion Dispersion Rank Rank (yd^2) (yds) (yds) System C (3/98) 220.1 6.2 230.2 5.3 0.0 -7.3 8.0 495.6 10.34 0.0 0.0 Staz. Batata 100 219.6 5.9 227.3 6.7 -2.9 -8.1 8.9 724 8 8.44 -4 7 -7 6 Staz. Raw Distance 222.1 6.8 228.9 7.2 -1 3 -8.2 10 3 936.2 7.48 -8 3 -9.6 Staz. Power Control 222.7 6.4 228.1 7.4 -2.1 -6.9 10 6 944.0 7.42 -8 5 -10.6 Staz. Tour Ca@bre 219.1 7.3 226.2 7.8 -4.0 -8.7 9 2 852.5 7.75 -6 9 -10 9 Great Big Bettha 10.0 R-Flex Angle=10.9,Speed-206,Spin-3680 05179801 Minimum Ellipse method Carry Distance (yds) Total Distance (yds) Distance Carry Devlation (yds) Total Distance/ Dispersion Combined Ball Type Average Std.Dev Average Std.Dev Rank Average Std Dev. Dispersion Dispersion Rank Rank (yd^2) (yds) (yds) System C 222.0 5.3 240.9 5.7 -2.6 1 9 9 9 680.6 9.23 0.0 -2 6 Professional 90 219.1 5.1 240.4 6.4 -3.1 -1.9 10.1 816.6 8.41 -2.5 -5.6 Tour Distance 90 221.7 3.7 241.4 5.2 -2.1 0.8 14.0 880.8 8.13 -3.6 -5 7 Staz. Power Control 224.5 5.9 243.5 6.7 0.0 0.4 13.6 1094 7 7.36 -7 0 -7.0 HP2 Tour 220.9 5.4 237.9 6.6 -5.6 0.3 10 1 806 3 8.38 -2.3 -7.9 Revolution 90 220.4 4.7 240.3 7.0 -3.2 0 1 11.7 963.2 7.74 -4.9 -8 1 Tour Batata 90 216.4 4.4 235.9 5.4 -7.6 -0.2 13.1 857.0 8.06 -3.2 -10.8 Staz. Raw Distance 224.1 5.2 241.3 7.4 -2.2 1.8 13.6 1224.4 6.90 -8.9 -11.1 EV Extra Spin 219.5 5.2 236.3 8.7 -7.2 0.0 10.5 1058.9 7.26 -6.4 -13.6 Staz. Tour Ca@bre 219.5 5.9 238.4 8.2 -5.1 -1.0 12.3 1226.4 6.81 -8.9 -14.0 DT Wound 90 222.1 4.3 240.6 7.4 -2.9 2.8 13.6 1444.0 6.33 -11.9 -14.8 Table 5 Biggest Big Bertha 10.0 R-Flex Angle=10.6, Speed=210.5, Spin=4080 0110981c Minimum Ellip Carry Distance (yds) Total Dislance (yds) Distance Carry Dev@ation (yds) Total Dist Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Dispersion Dis (yd^2) Club System C 226.9 4.6 232.1 4.7 -4.0 -5.9 9.1 458.8 Tour Distance 90 227.6 4.9 231.7 4.8 -4.4 -5.1 8.6 453.3 Club System T 230.0 5.6 234.8 7.0 -1.3 -6.0 9.4 745.7 EV Extra Spin 225.2 6.1 228.2 5.5 -7.9 -5.2 7.8 470.1 Revolution 90 226.6 5.7 229.9 5.3 -6.2 -5.0 9.8 560.5 Hot XL Tour 232.0 4.4 236.1 5.7 0.0 -6.2 12.3 1008.1 HP2 Tour 222.1 5.5 227.3 4.9 -8.8 -5.1 9.4 539.9 Tour Balata 90 222.0 4.9 227.0 4.7 -9.1 -4.8 9.7 537.2 Professional 90 222.6 5.2 226.3 4.8 -9.8 -4.8 10.2 566.7 DT Wound 90 226.8 5.2 230.9 6.6 -5.2 -6.4 12.6 888.7 Table 6 Burner Bubble 10.5 R-Flex Angle=11.8, Speed=207, Spin=3900 0319983C Minumum Area Total @ Carry Distance (yds) Total Dist ance(yds) Distance Deviation (yds) Dispersion Dis@ Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Area R (@ System T 219.4 5.6 223.1 6.6 0.0 -1.8 4.3 311.5 Tour Distance 9 218.7 5.4 222.6 5.6 -0.5 -0.5 6.9 475.7 Professional 90 214.9 4.9 219.6 5.1 -3.5 0.4 6.6 391.3 Revolution 100 215.6 5.2 219.9 6.0 -3.2 0.4 6.7 432.0 DT Wound 90 215.1 6.2 218.8 6.8 -4.3 -1.3 6.2 477.0 HP2 Tour Old 216.4 6.7 220.5 7.6 -2.6 -0.5 7.0 635.6 EV Extra Spin 215.1 6.3 218.3 6.5 -4.8 0.1 6.7 526.4 HP2 Tour New 217.0 6.5 220.2 6.4 -2.9 2.6 8.0 609.9 Tour Balata 90 211.3 5.1 216.1 6.5 -7.0 1.7 9.1 738.5 Table 7 Taylor Made TI Bubble 10.5 R-Flex Angle=10.5, Speed=205.0, Spin=3900 0112981c Min Total Carry Distance (yds) Total Distance (yds) Distance Carry Deviation (yds) Dispersion Dis Ball Type Average Std.Dev Average Std.Dev. Rank Average Std.Dev. Area @ Club System T 229.1 4.0 235.3 3.9 -5.7 2.9 8.7 393.1 Club System C 226.0 3.7 234.0 3.6 -7.0 3.9 9.5 408.9 Hot XL Tour 231.9 4.7 241.0 5.2 0.0 1.7 13.6 847.2 Tour Distance 90 227.0 3.8 235.8 4.7 -5.2 2.1 12.7 666.0 Revolution 90 224.9 4.4 232.8 4.9 -8.2 4.6 10.1 547.6 EV Extra Spin 222.8 5.5 229.5 5.3 -11.5 4.9 11.0 573.6 DT Wound 90 227.0 4.4 234.8 6.2 -6.2 3.2 11.8 914.8 Professional 90 221.3 4.3 228.9 5.1 -12.1 3.7 10.4 638.8 HP2 Tour 220.4 4.9 228.8 6.7 -12.2 3.3 10.1 662.2 Tour Balata 90 220.4 4.3 227.7 5.9 -13.3 4.2 11.3 763.4 Table 8 Taylor Made Ti Bubble II 9.5 R-Flex Angle=11.6, Speed=216.0, Spin=4030 1210975c Minumum Area Ellipse Method Total Total Carry Distance (yds) Total Distane (yds) Distance Carry Devation (yds) Dispersion Dispersion Combined Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Area Rank Rank (yds) (yds) Club System T 231.6 8.2 237.7 8.5 0.0 -8.8 7.1 692.7 -1.0 -1.0 Club System C 229.9 7.2 235.4 8.2 -2.3 -8.3 7.6 694.0 -1.0 -3.3 DT Wound 90 228.3 7.4 232.1 7.8 -5.6 -9.6 8.0 647.4 -0.1 -5.7 Tour Distance 90 230.8 7.7 236.4 8.8 -1.3 -8.6 10.6 846.7 -3.8 -5.1 EV Extra Spin 228.1 8.7 232.1 8.6 -5.6 -9.7 8.7 762.4 -2.3 -7.9 HP2 Tour 224.3 7.2 229.7 6.6 -8.0 -10.1 9.1 640.2 0.0 -8.0 Professional 90 225.3 7.1 229.1 7.1 -8.6 -7.9 8.9 670.0 -0.6 -9.2 Tour Balata 90 223.4 7.2 228.7 6.7 -9.0 -10.0 10.6 725.0 -1.6 -10.6 Taylor Made Ti Bubble II 9.5 R-Flex Angle=11.9, Speed=210, Spin=3735 0130983c Minumum Area Ellipse Method Total Total Carry Distance (yds) Total Distance (yds) Distance Carry Deviation (yds) Dispersion Dispersion Combined Ball Type Average Std.Dev Average Std.Dev. Rank Average Std.Dev. Area Rank Rank @ (yds) (yds) Club System T 216.6 3.8 221.6 4.5 0.0 -1.1 7.7 375.6 0.0 0.0 Staff Ti Spin 90 213.2 4.2 218.9 6.1 -2.7 -3.8 10.1 665.2 -6.4 -9.1 Maxffi XS Tour 90 211.2 3.4 215.5 4.2 -6.1 -1.8 9.3 442.5 -1.7 -7.8 Staff Balata Ti 90 210.3 3.7 215.0 4.6 -6.6 -3.3 10.2 558.6 -4.3 -10.9 Revolution 90 208.4 4.2 213.8 6.2 -7.8 -3.1 10.9 693.3 -7.0 -14.8 Maxffi HT 90 205.5 4.5 211.5 5.5 -10.1 -0.3 9.1 616.4 -5.4 -15.5 Duniop Mag. Spin 206.4 4.6 209.3 5.4 -12.3 -1.7 8.1 547.5 -4.0 -16.3 Srbron Hi Brid 206.2 4.6 209.6 5.0 -12.0 -1.2 10.3 662.7 -6.4 -18.4 Maxffi RM 100 203.8 7.3 208.0 8.5 -13.6 -1.8 9.4 932.4 -11.2 -24.8 Taylor Made Ti Bubble II 9.5 R-Flex Angle=11.8, Speed=191, Spin=3872 0130986c Minumum Area Ellipse Method Total Total Carry Distance (yds) Total Distance (yds) Distance Carry Deviation (yds) Dispersion Dispersion Combined Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std Dev. Area Rank Rank @ (yds) (yds) Club System T 195.7 4.6 205.1 5.9 0.0 -3.9 9.0 673.2 -0.7 -0.7 Tour Distance 90 192.5 4.2 204.0 6.8 -1.1 -4.9 9.9 707.1 -1.3 -2.4 Hot XL Tour 195.6 5.5 203.5 7.0 -1.6 -4.3 8.5 688.4 -0.9 -2.5 HP2 Tour 187.9 4.8 196.9 5.7 -8.2 -5.8 9.5 639.8 0.0 -8.2 EV Extra Spin 188.5 4.2 195.8 6.4 -9.3 -4.0 10.2 734.4 -1.8 -11.1 DT Wound 90 189.8 5.7 197.0 7.6 -8.1 -3.5 10.1 864.0 -4.1 -12.2 Professional 90 186.9 5.4 194.4 8.4 -10.7 -3.4 10.0 1028.7 -5.8 -17.5 Tour Balata 90 188.3 5.7 195.8 7.4 -9.3 -5.0 12.1 931.0 -5.2 -14.5 Table 9 Taylor Made Ti Bubble II 9.5 R-Flex Angle=11.6, Speed=192, Spin=3880 0201983c Minumum Area Ellipse Total Total Carry Distance (yds) Total Distance (yds) Distance Carry Deviation (yds) Dispersion Dispersion Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Area Rank (yds) Club System T 201.9 4.9 223.5 6.2 0.0 -6.7 11.6 974.6 -3.0 Maxffi HT 90 196.1 5.4 215.3 5.3 -8.2 -6.0 11.8 793.7 0.0 Staff Balata Ti 90 196.6 5.3 218.1 7.0 -5.4 -6.1 11.3 1013.5 -3.7 Maxffi XS Tour 90 199.0 5.4 217.6 7.3 -5.9 -4.9 12.5 1072.7 -4.6 Staff Ti Spin 90 199.2 4.5 220.3 9.2 -3.2 -7.0 12.0 1282.2 -7.6 Revolution 90 198.5 5.1 217.9 7.9 -5.6 -6.6 12.1 1128.7 -5.4 Srixon Hi Brid 198.7 5.0 215.1 7.1 -8.4 -6.6 13.4 1131.8 -5.5 Dunlop Mag. Spin 197.4 5.2 212.9 7.4 -10.6 -5.7 11.8 1051.2 -4.2 Maxffi RM 100 196.6 6.7 213.8 8.9 -9.7 -5.0 12.2 1340.5 -8.4 Taylor Made Ti Bubble II 9.5 R-Flex Note: Machine not running good Angle=11.5, Sped=207.9, Spin=3767 variable club speed 0406983c Minumum Area Ellipse Total Total Carry Distance (yds) Total Distance (yds) Distance Carry Deviation (yds) Dispersion Dispersion Ball Type Average Std.Dev. Average Std.Dev. Rank Average Std.Dev. Area Rank (yds) System T (3/98) 230.3 4.6 250.5 7.1 -2.2 -7.3 6.3 492.6 -0.1 DT Wound 100 232.1 4.7 248.7 7.4 -4.0 -8.1 5.9 515.5 -0.7 Professional 100 230.2 4.3 248.6 7.2 -4.1 -9.8 6.8 555.8 -1.5 Staz. Raw Distance 233.7 5.7 250.6 10.1 -2.1 -9.8 5.9 677.4 -4.0 Tour Balata 100 226.8 4.0 244.1 7.0 -8.6 -6.8 5.9 486.0 0.0 Staz. Tour Caffbre 229.4 5.8 248.5 8.0 -4.2 -8.4 7.5 710.0 -4.6 EV Extra Spin 230.3 5.3 246.9 7.8 -5.8 -10.5 7.3 655.8 -3.6 HP2 Tour 232.8 4.7 252.7 8.5 0.0 -8.6 9.6 988.4 -9.4