Patent Publication Number: US-7588501-B2

Title: Golf club head

Description:
CROSS REFERENCES TO RELATED APPLICATIONS 
   The Present application is a continuation of U.S. patent application Ser. No. 11/868,638, filed on Oct. 8, 2007, which is a continuation of U.S. patent application Ser. No. 11/625,176, filed on Jan. 19, 2007, now U.S. Pat. No. 7,291,075, which is a continuation of U.S. patent application Ser. No. 11/161,199, filed on Jul. 26, 2005, now U.S. Pat. No. 7,166,038, which claims priority to U.S. Provisional Patent Application No. 60/641,283, filed Jan. 3, 2005, now abandoned. 

   STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
   Not Applicable 
   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a golf club head. More specifically, the present invention relates to a substantially square or substantially rectangular golf club head. 
   2. Description of the Related Art 
   When a golf club head strikes a golf ball, large impacts are produced that load the club head face and the golf ball. Most of the energy is transferred from the head to the golf ball, however, some energy is lost as a result of the collision. The golf ball is typically composed of polymer cover materials (such as ionomers) surrounding a rubber-like core. These softer polymer materials having damping (loss) properties that are strain and strain rate dependent which are on the order of 10-100 times larger than the damping properties of a metallic club face. Thus, during impact most of the energy is lost as a result of the high stresses and deformations of the golf ball (0.001 to 0.20 inch), as opposed to the small deformations of the metallic club face (0.025 to 0.050 inch). A more efficient energy transfer from the club head to the golf ball could lead to greater flight distances of the golf ball. 
   The generally accepted approach has been to increase the stiffness of the club head face to reduce metal or club head deformations. However, this leads to greater deformations in the golf ball, and thus increases in the energy transfer problem. 
   Some have recognized the problem and disclosed possible solutions. An example is Campau, U.S. Pat. No. 4,398,965, for a Method Of Making Iron Golf Clubs With Flexible Impact Surface, which discloses a club having a flexible and resilient face plate with a slot to allow for the flexing of the face plate. The face plate of Campau is composed of a ferrous material, such as stainless steel, and has a thickness in the range of 0.1 inches to 0.125 inches. 
   Another example is Eggiman, U.S. Pat. No. 5,863,261, for a Golf Club Head With Elastically Deforming Face And Back Plates, which discloses the use of a plurality of plates that act in concert to create a spring-like effect on a golf ball during impact. A fluid is disposed between at least two of the plates to act as a viscous coupler. 
   Yet another example is Jepson et al, U.S. Pat. No. 3,937,474, for a Golf Club With A Polyurethane Insert. Jepson discloses that the polyurethane insert has a hardness between 40 and 75 shore D. 
   Still another example is Inamori, U.S. Pat. No. 3,975,023, for a Golf Club Head With Ceramic Face Plate, which discloses using a face plate composed of a ceramic material having a high energy transfer coefficient, although ceramics are usually harder materials. Chen et al., U.S. Pat. No. 5,743,813 for a Golf Club Head, discloses using multiple layers in the face to absorb the shock of the golf ball. One of the materials is a non-metal material. 
   Lu, U.S. Pat. No. 5,499,814, for a Hollow Club Head With Deflecting Insert Face Plate, discloses a reinforcing element composed of a plastic or aluminum alloy that allows for minor deflecting of the face plate which has a thickness ranging from 0.01 to 0.30 inches for a variety of materials including stainless steel, titanium, KEVLAR®, and the like. Yet another Campau invention, U.S. Pat. No. 3,989,248, for a Golf Club Having Insert Capable Of Elastic Flexing, discloses a wood club composed of wood with a metal insert. 
   Although not intended for flexing of the face plate, Viste, U.S. Pat. No. 5,282,624, discloses a golf club head having a face plate composed of a forged stainless steel material and having a thickness of 3 mm. Anderson, U.S. Pat. No. 5,344,140, for a Golf Club Head And Method Of Forming Same, also discloses the use of a forged material for the face plate. The face plate of Anderson may be composed of several forged materials including steel, copper and titanium. The forged plate has a uniform thickness of between 0.090 and 0.130 inch. 
   Another invention directed toward forged materials in a club head is Su et al., U.S. Pat. No. 5,776,011 for a Golf Club Head. Su discloses a club head composed of three pieces with each piece composed of a forged material. The main objective of Su is to produce a club head with greater loft angle accuracy and reduce structural weaknesses. Aizawa, U.S. Pat. No. 5,346,216 for a Golf Club Head, discloses a face plate having a curved ball hitting surface. 
   U.S. Pat. No. 6,146,571 to Vincent, et. al., discloses a method of manufacturing a golf club head wherein the walls are obtained by injecting a material, such as plastic, over an insert affixed to a meltable core. The core has a melt point lower than that of the injectable plastic material so that once the core is removed, an inner volume is maintained to form the inner cavity. The insert may comprise a resistance element for reinforcing the internal portion of the front wall of the shell upon removal of the core where the reinforcement element is comprised of aluminum with a laterally extending portion comprised of steel. 
   U.S. Pat. No. 6,149,534 to Peters, et al., discloses a golf club head having upper and lower metal engagement surfaces formed along a single plane interface wherein the metal of the lower surface is heavier and more dense than the metal of the upper surface. 
   U.S. Pat. Nos. 5,570,886 and 5,547,427 to Rigal, et al., disclose a golf club head of molded thermoplastic having a striking face defined by an impact-resistant metallic sealing element. The sealing element defines a front wall of the striking surface of the club head and extends upward and along the side of the impact surface to form a neck for attachment of the shaft to the club head. The sealing element preferably being between 2.5 and 5 mm in thickness. 
   U.S. Pat. No. 5,425,538 to Vincent, et al., discloses a hollow golf club head having a steel shell and a composite striking surface composed of a number of stacked woven webs of fiber. 
   U.S. Pat. No. 5,377,986 to Viollaz, et al., discloses a golf club head having a body composed of a series of metal plates and a hitting plate comprised of plastic or composite material wherein the hitting plate is imparted with a forwardly convex shape. Additionally, U.S. Pat. No. 5,310,185 to Viollaz, et al., discloses a hollow golf club head having a body composed of a series of metal plates, a metal support plate being located on the front hitting surface to which a hitting plate comprised of plastic or composite is attached. The metal support plate has a forwardly convex front plate associated with a forwardly convex rear plate of the hitting plate thereby forming a forwardly convex hitting surface. 
   U.S. Pat. No. 5,106,094 to Desboilles, et al., discloses a golf club head having a metal striking face plate wherein the striking face plate is a separate unit attached to the golf club head with a quantity of filler material in the interior portion of the club head. 
   U.S. Pat. No. 4,568,088 to Kurahashi discloses a wooden golf club head body reinforced by a mixture of wood-plastic composite material. The wood-plastic composite material is unevenly distributed such that a higher density in the range of between 5 and 15 mm lies adjacent to and extends substantially parallel with the front face of the club head. 
   U.S. Pat. No. 4,021,047 to Mader discloses a golf club wherein the sole plate, face plate, heel, toe and hosel portions are formed as a unitary cast metal piece and wherein a wood or composite crown is attached to this unitary piece thereby forming a hollow chamber in the club head. 
   U.S. Pat. No. 5,624,331 to Lo, et al. discloses a hollow metal golf club head where the metal casing of the head is composed of at least two openings. The head also contains a composite material disposed within the head where a portion of the composite material is located in the openings of the golf club head casing. 
   U.S. Pat. No. 1,167,387 to Daniel discloses a hollow golf club head wherein the shell body is comprised of metal such as aluminum alloy and the face plate is comprised of a hard wood, such as beech, persimmon or the like. The face plate is aligned such that the wood grain presents endwise at the striking plate. 
   U.S. Pat. No. 3,692,306 to Glover discloses a golf club head having a bracket with sole and striking plates formed integrally thereon. At least one of the plates has an embedded elongate tube for securing a removably adjustable weight means. 
   U.S. Pat. No. 5,410,798 to Lo discloses a method of manufacturing a composite golf club head using a metal casing to which a laminated member is inserted. A sheet of composite material is subsequently layered over the openings of the laminated member and metal casing to close off the openings in the top of both. An expansible pocket is then inserted into the hollow laminated member comprising sodium nitrite, ammonium chloride and water causing the member to attach integrally to the metal casing when the head is placed into a mold and heated. 
   U.S. Pat. No. 4,877,249 to Thompson discloses a wood golf club head embodying a laminated upper surface and metallic sole surface having a keel. In order to reinforce the laminations and to keep the body from delaminating upon impact with an unusually hard object, a bolt is inserted through the crown of the club head where it is connected to the sole plate at the keel and tightened to compress the laminations. 
   U.S. Pat. No. 3,897,066 to Belmont discloses a wooden golf club head having removably inserted weight adjustment members. The members are parallel to a central vertical axis running from the face section to the rear section of the club head and perpendicular to the crown to toe axis. The weight adjustment members may be held in place by the use of capsules filled with polyurethane resin, which can also be used to form the faceplate. The capsules have openings on a rear surface of the club head with covers to provide access to adjust the weight means. 
   U.S. Pat. No. 2,750,194 to Clark discloses a wooden golf club head with weight adjustment means. The golf club head includes a tray member with sides and bottom for holding the weight adjustment preferably cast or formed integrally with the heel plate. The heel plate with attached weight member is inserted into the head of the golf club via an opening. 
   U.S. Pat. No. 5,193,811 to Okumoto, et al. discloses a wood type club head body comprised primarily of a synthetic resin and a metallic sole plate. The metallic sole plate has on its surface for bonding with the head body integrally formed members comprising a hosel on the heel side, weights on the toe and rear sides and a beam connecting the weights and hosel. Additionally, U.S. Pat. No. 5,516,107 to Okumoto, et al., discloses a golf club head having an outer shell, preferably comprised of synthetic resin, and metal weight member/s located on the interior of the club head. A foamable material is injected into the hollow interior of the club to form the core. Once the foamable material has been injected and the sole plate is attached, the club head is heated to cause the foamable material to expand thus holding the weight member/s in position in recess/es located in toe, heel and/or back side regions by pushing the weight member/s into the inner surface of the outer shell. 
   U.S. Pat. No. 4,872,685 to Sun discloses a wood type golf club head wherein a female unit is mated with a male unit to form a unitary golf club head. The female unit comprises the upper portion of the golf club head and is preferably composed of plastic, alloy, or wood. The male unit includes the structural portions of sole plate, a face insert consists of the striking plate and weighting elements. The male unit has a substantially greater weight and is preferably composed of a light metal alloy. The units are mated or held together by bonding and or mechanical means. 
   U.S. Pat. No. 5,398,935 to Katayama discloses a wood golf club head having a striking face wherein the height of the striking face at a toe end of the golf club head is nearly equal to or greater than the height of the striking face at the center of the club head. 
   U.S. Pat. No. 1,780,625 to Mattern discloses a club head with a rear portion composed of a light-weight metal, such as magnesium. U.S. Pat. No. 1,638,916 to Butchart discloses a golf club with a balancing member composed of persimmon or a similar wood material, and a shell-like body composed of aluminum attached to the balancing member. 
   U.S. Pat. No. 3,981,507 to Nunziato discloses a cube-like club head to provide a rectangular face. 
   U.S. Pat. No. 2,336,405 to Kent discloses a golf club with a trapezoidal shaped club head. 
   U.S. Pat. No. D226,431 to Baker discloses a design for a club head with a greater rear-wall. 
   U.S. Pat. No. 3,397,888 to Springer et al., discloses a putter head with a rectangular shape. 
   U.S. Pat. No. 3,486,755 to Hodge discloses a putter with a triangular-like shape. 
   U.S. Pat. No. 3,901,514 discloses a putter with a club head shaped like a ring. 
   U.S. Pat. No. D179,002 to Hoffmeister discloses a design for a club head with a circular face and an elongated body. 
   The Rules of Golf, established and interpreted by the United States Golf Association (“USGA”) and The Royal and Ancient Golf Club of Saint Andrews, set forth certain requirements for a golf club head. The requirements for a golf club head are found in Rule 4 and Appendix II. A complete description of the Rules of Golf are available on the USGA web page at www.usga.org. One such limitation is the volume of the golf club head. 
   Existing large volume driver heads (&gt;400 cc) composed of conventional materials (titanium, steel) and conventional manufacturing methods (casting, forging, MIM, machining, etc.) are limited in the amount of discretionary material available for increasing the moments of inertia of the golf club head. Conventional golf club head shapes also limit the moments of inertia possible for any given volume golf club head. 
   BRIEF SUMMARY OF THE INVENTION 
   One aspect of the present invention is a substantially square golf club head with a moment of inertia, Izz, about the center of gravity of the golf club head that exceeds 4000 grams-centimeter squared. 
   Another aspect of the present invention is a multi-material substantially square golf club head including a metallic face component and a non-metallic aft-body component that is bonded to the face component. 
   Yet another aspect of the present invention is a golf club head comprising a front wall, a heel, an aft wall and a toe wall. The front wall has a perimeter. The heel wall extends 2.5 inches to 4.5 inches rearward from the perimeter of the front wall. The aft wall is substantially perpendicular to the heel wall and the aft wall extends from 2.5 inches to 4.5 inches from an aft edge of the heel wall. The toe wall is substantially perpendicular to the aft wall and the toe wall extends from 2.5 inches to 4.5 inches from an aft edge of the toe wall. 
   The heel wall, the aft wall and the toe wall preferably each have the same height. The heel wall, the aft wall and the toe wall preferably each have a height ranging from 1.5 inches to 3.0 inches. The golf club head preferably has a volume that ranges from 350 cubic centimeters to 500 cubic centimeters, and even more preferably ranges from 400 cubic centimeters to 460 cubic centimeters. 
   Another aspect of the present invention is a golf club head with a body having a front wall, a crown wall, a sole wall, a heel wall, an aft wall, and a toe wall, in which the body has a volume ranging from 350 cubic centimeters to 500 cubic centimeters and each of the aft wall, the toe wall and the heel wall is substantially straight. 
   The golf club head preferably has a geometric center point, an aft-heel edge point and an aft-toe edge point, in which the distance from the geometric center point to the aft-heel edge point is equal to the distance from the geometric center point to the aft-toe edge point. The golf club head may also include an aft-heel curvature section between the aft wall and the heel wall, and an aft-toe curvature section between the aft wall and the toe wall. Each of the aft-heel curvature section and the aft-toe curvature section preferably has a curvature length ranging from 0.5 inch to 1.0 inch. The heel wall preferably extends rearward from a perimeter of the front wall a distance of least 50% of the length of the heel wall at an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the face. The heel wall more preferably extends rearward from a perimeter of the front wall a distance of least 66% of the length of the heel wall at an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the face. The heel wall even more preferably extends rearward from a perimeter of the front wall a distance of least 75% of the length of the heel wall at an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the face. The heel wall yet even more preferably extends rearward from a perimeter of the front wall a distance of least 90% of the length of the heel wall at an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the face. The heel wall yet even more preferably extends rearward from a perimeter of the front wall a distance of least 95% of the length of the heel wall at an angle of 70 degrees to 90 degrees relative to a plane parallel to the farthest extent of the face. The distance from the geometric center point to the aft-heel edge point and the distance from the geometric center point to the aft-toe edge point are preferably the greatest lengths of the geometric center point to a location on the golf club head. 
   Another aspect of the present invention is a substantially square golf club head with a face component and an aft-body. The face component is composed of a first material, and includes a striking plate portion and a return portion. The return portion extends a distance ranging from 0.25 inch to 1.5 inches from a perimeter of the striking plate portion. The square aft-body is coupled to the return portion of the face component. The aft-body is composed of a second material having a density less than that of the first material. Each aft-body includes a crown portion and a sole portion. The sole portion has a bottom section and a ribbon section with the ribbon section being located between the crown portion and the bottom section of the sole portion. 
   Having briefly described the present invention, the above and further objects, features and advantages thereof will be recognized by those skilled in the pertinent art from the following detailed description of the invention when taken in conjunction with the accompanying drawings. 

   
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       FIG. 1  is a perspective view of a club head of the present invention. 
       FIG. 1A  is a front view of a golf club of the present invention. 
       FIG. 2  is a front view of the club head of  FIG. 1 . 
       FIG. 3  is a heel side view of the club head of  FIG. 1 . 
       FIG. 4  is a toe side view of the club head of  FIG. 1 . 
       FIG. 5  is a rear plan view of the club head of  FIG. 1 . 
       FIG. 6  is a top plan view of the club head of  FIG. 1 . 
       FIG. 7  is a bottom plan view of the club head of  FIG. 1 . 
       FIG. 8  is a top plan view of a club head of the prior art. 
       FIG. 9  is a bottom plan view of the club head of  FIG. 8 . 
       FIG. 10  is a perspective view of a preferred embodiment of the club head of the present invention. 
       FIG. 11  is a front view of the club head of  FIG. 10 . 
       FIG. 12  is a heel side view of the club head of  FIG. 10 . 
       FIG. 13  is a toe side view of the club head of  FIG. 10 . 
       FIG. 14  is a rear plan view of the club head of  FIG. 10 . 
       FIG. 15  is a top plan view of the club head of  FIG. 10 . 
       FIG. 16  is a bottom plan view of the club head of  FIG. 10 . 
       FIG. 17  is a top plan view of a club head of the present invention illustrating the wall angles relative to each other. 
       FIG. 18  is a bottom plan view of a club head of the present invention illustrating the wall angles relative to each other. 
       FIG. 19  is a bottom plan view of a club head of the present invention illustrating the wall angles relative to each other. 
       FIG. 20  is a top plan view of a club head of the present invention illustrating the wall angles relative to each other. 
       FIG. 21  is a top plan view of a club head of the present invention illustrating the wall angles relative to each other. 
       FIG. 22  is a front view of an alternative embodiment of a club head of the present invention. 
       FIG. 23  is a top plan view of the club head of  FIG. 22 . 
       FIG. 24  is a bottom plan view of the club head of  FIG. 22 . 
       FIG. 25  is a rear plan view of the club head of  FIG. 22 . 
       FIG. 26  is a heel side view of the club head of  FIG. 22 . 
       FIG. 27  is a toe side view of the club head of  FIG. 22 . 
       FIG. 28  is a front view of an alternative embodiment of a club head of the present invention. 
       FIG. 29  is a top plan view of the club head of  FIG. 28 . 
       FIG. 30  is a bottom plan view of the club head of  FIG. 28 . 
       FIG. 31  is a rear plan view of the club head of  FIG. 28 . 
       FIG. 32  is a heel side view of the club head of  FIG. 28 . 
       FIG. 33  is a toe side view of the club head of  FIG. 28 . 
       FIG. 34  is a front view of an alternative embodiment of a club head of the present invention. 
       FIG. 35  is a top plan view of the club head of  FIG. 34 . 
       FIG. 36  is a bottom plan view of the club head of  FIG. 34 . 
       FIG. 37  is a rear plan view of the club head of  FIG. 34 . 
       FIG. 38  is a heel side view of the club head of  FIG. 34 . 
       FIG. 39  is a toe side view of the club head of  FIG. 34 . 
       FIG. 40  is an isolated interior view of a face component for a club head of the present invention. 
       FIG. 41  is an isolated bottom plan view of a face component for a club head of the present invention. 
       FIG. 42  is an isolated toe side view of a face component for a club head of the present invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   The present invention is generally directed at a golf club head that has a substantially square or rectangular shape as viewed from the top or bottom (as opposed to a side view) and has a relatively high moment of inertia Izz about the center of gravity of the golf club head. A general embodiment of the club head is illustrated in  FIGS. 1-7 . A preferred embodiment of the club head is illustrated in  FIGS. 10-16 . An alternative embodiment of the club head is illustrated in  FIGS. 22-27 . A second alternative embodiment of the club head is illustrated in  FIGS. 28-33 . A third alternative embodiment of the club head is illustrated in  FIGS. 34-39 . Although five embodiments are illustrated, those skilled in the pertinent art will recognize from this disclosure that other embodiments of the golf club head of the present invention are possible without departing from the scope and spirit of the present invention. 
   As shown in  FIGS. 1-7 , a golf club head of the present invention is generally designated  42 . Preferably, a body  43  of the golf club head has a crown  62 ′, a sole  64 ′, a ribbon  90 ′, and a striking plate  72 ′, all of which preferably define a hollow interior. The golf club head  42  has a heel end  66 , a toe end  68  an aft end  70 . 
   The golf club head  42 , when designed as a driver, preferably has a volume from 200 cubic centimeters to 600 cubic centimeters, more preferably from 300 cubic centimeters to 500 cubic centimeters, and most preferably from 420 cubic centimeters to 470 cubic centimeters, with a most preferred volume of 460 cubic centimeters. The volume of the golf club head  42  will also vary between fairway woods (preferably ranging from 3-woods to eleven woods) with smaller volumes than drivers. 
   The golf club head  42 , when designed as a driver, preferably has a mass no more than 215 grams, and most preferably a mass of 180 to 215 grams. When the golf club head  42  is designed as a fairway wood, the golf club head preferably has a mass of 135 grams to 200 grams, and preferably from 140 grams to 165 grams. 
   As shown in  FIG. 1A , a golf club  40  has a substantially square golf club head  42 . Engaging the club head  42  is a shaft  48  that has a grip  50  at a butt end  52  of the shaft  48  and is inserted into a hosel  54  of the club head  42  at a tip end  56  of the shaft  48 . 
   The club head  42  has a heel wall  166 , a toe wall  168  and a rear wall  170  that are substantially straight relative to each other and the striking plate  72 ′ of the club head  42 . Further, the heel wall  166 , the toe wall  168  and the rear wall  170  is each substantially straight when compared to the walls of a prior art club head shown in  FIGS. 8 and 9 . 
   As shown in  FIG. 3 , the heel wall  166  has a distance, “Dhw”, from a perimeter  73  of the striking plate  72 ′ to a furthest rearward extent of the club head  42  that preferably ranges from 2.00 to 5.00 inches, more preferably from 3.0 to 4.5 inches, and most preferably from 3.5 to 4.0 inches. 
   As shown in  FIG. 4 , the toe wall  168  has a distance, “Dtw”, from a perimeter  73  of the striking plate  72 ′ to a furthest rearward extent of the club head  42  that preferably ranges from 2.00 to 5.00 inches, more preferably from 3.0 to 4.5 inches, and most preferably from 3.5 to 4.0 inches. 
   As shown in  FIG. 5 , the rear wall  170  has a distance, “Daw”, from a widest extent of the heel end  66  of the club head to a widest extent of the toe end  68  of the club head  42  that preferably ranges from 2.50 to 5.50 inches, more preferably from 3.0 to 4.75 inches, and most preferably from 4.0 to 4.5 inches. 
   In one embodiment, the distances Dhw, Dtw and Daw are all equal in length ranging from 3.5 to 4.25 inches. In an alternative embodiment, the distances Dhw and Dtw are equal in length ranging from 2.5 to 4.0 inches. 
   As shown in  FIG. 6 , a geometric center of the club head  42  is designated “GC.” The geometric center is defined as the center based on the geometry of the club head  42 . A distance “Dgh” from the geometric center to an aft-heel edge point  150  ranges from 1.5 inches to 3.5 inches, and more preferably from 2.0 inches to 3.0 inches, and is most preferably 2.5 inches. A distance “Dgt” from the geometric center to an aft-toe edge point  155  ranges from 1.5 inches to 3.5 inches, and more preferably from 2.0 inches to 3.0 inches, and is most preferably 2.5 inches. In a preferred embodiment, the distances Dgh and Dgt are the farthest distances of any point on the club head  42  from the geometric center. In an alternative embodiment, the distances Dgh and Dgt are at least equal to the farthest distances of any point on the club head  42  from the geometric center. The aft-heel edge point  150  is defined as the inflection point along the edge of the heel wall  166  and the rear wall  170  wherein the heel wall  166  transitions to the rear wall  170 . The aft-toe edge point  155  is defined as the inflection point along the edge of the toe wall  168  and the rear wall  170  wherein the toe wall  168  transitions to the rear wall  170 . 
   As shown in  FIG. 6 , the club head  42  has an aft-heel curvature section  200  and an aft-toe curvature section  205 . The aft-heel curvature section  200  is the transition from the heel wall  166  to the rear wall  170 . The aft-toe curvature section  205  is the transition from the toe wall  168  to the rear wall  170 . The club head  42  of the present invention has a reduced curvature section as compared to club head  42   x  of the prior art. 
   As shown in  FIG. 7 , the heel wall  166  has a distance, “Dhw′”, from a perimeter  73  of the striking plate  72 ′ to the aft-heel edge point  150  that preferably ranges from 2.00 to 4.5 inches, more preferably from 2.5 to 4.25 inches, and most preferably from 3.0 to 4.0 inches. 
   As shown in  FIG. 7 , the toe wall  168  has a distance, “Dtw′”, from a perimeter  73  of the striking plate  72 ′ to the aft-toe edge point  155  that preferably ranges from 2.00 to 4.5 inches, more preferably from 2.5 to 4.25 inches, and most preferably from 3.0 to 4.0 inches. 
   As shown in  FIG. 7 , the rear wall  170  has a distance, “Daw′”, from the aft-heel edge point  150  to the aft-toe edge point  155  that preferably ranges from 2.50 to 5.00 inches, more preferably from 3.0 to 4.0 inches, and most preferably from 3.25 to 3.75 inches. In a preferred embodiment, the distances Dhw′ and Dtw′ are equal in length ranging from 2.5 to 4.0 inches. 
   In a preferred embodiment, the club head  42  is generally composed of two components, a face component  60 , and an aft-body  61 , as shown in  FIGS. 10-16 . The aft-body  61  preferably has a crown portion  62  and a sole portion  64 . 
   The face component  60  is generally composed of a single piece of metal, and is preferably composed of a forged metal material. More preferably, the forged metal material is a forged titanium material. Such titanium materials include pure titanium and titanium alloys such as 6-4 titanium alloy, SP-700 titanium alloy (available from Nippon Steel of Tokyo, Japan), DAT 55G titanium alloy available from Diado Steel of Tokyo, Japan, Ti 10-2-3 Beta-C titanium alloy available from RTI International Metals of Ohio, and the like. Other metals for the face component  60  include stainless steel, other high strength steel alloy metals and amorphous metals. Alternatively, the face component  60  is manufactured through casting, forming, machining, powdered metal forming, metal-injection-molding, electro chemical milling, and the like. 
   The face component  60  generally includes a striking plate portion (also referred to herein as a face plate)  72  and a return portion  74  extending laterally inward from a perimeter  73  of the striking plate portion  72 . The striking plate portion  72  typically has a plurality of scorelines  75  thereon. The striking plate portion  72  preferably has a thickness ranging from 0.010 inch to 0.250 inch, and the return portion  74  preferably has a thickness ranging from 0.010 inch to 0.250 inch. The return portion  74  preferably extends a distance ranging from 0.25 inch to 1.5 inches from the perimeter  73  of the striking plate portion  72 . 
   In a preferred embodiment, the return portion  74  generally includes an upper lateral section  76 , a lower lateral section  78 , a heel lateral section  80  and a toe lateral section  82 . Thus, the return  74  preferably encircles the striking plate portion  72  a full 360 degrees. However, those skilled in the pertinent art will recognize that the return portion  74  may only encompass a partial section of the striking plate portion  72 , such as 270 degrees or 180 degrees, and may also be discontinuous. 
   The upper lateral section  76  preferably extends inward, towards the aft-body  61 , a predetermined distance, d, to engage the crown  62 . In a preferred embodiment, the predetermined distance ranges from 0.2 inch to 1.2 inch, more preferably 0.40 inch to 1.0 inch, and most preferably 0.8 inch, as measured from the perimeter  73  of the striking plate portion  72  to the rearward edge of the upper lateral section  76 . In a preferred embodiment, the upper lateral section  76  is substantially straight and substantially parallel to the striking plate portion  72  from the heel end  66  to the toe end  68 . 
   The perimeter  73  of the striking plate portion  72  is preferably defined as the transition point where the face component  60  transitions from a plane substantially parallel to the striking plate portion  72  to a plane substantially perpendicular to the striking plate portion  72 . Alternatively, one method for determining the transition point is to take a plane parallel to the striking plate portion  72  and a plane perpendicular to the striking plate portion, and then take a plane at an angle of forty-five degrees to the parallel plane and the perpendicular plane. Where the forty-five degrees plane contacts the face component is the transition point thereby defining the perimeter of the striking plate portion  72 . 
   The heel lateral section  80  is substantially perpendicular to the striking plate portion  72 , and the heel lateral section  80  preferably covers a portion of the hosel  54  before engaging an optional ribbon section  90  and a bottom section  91  of the sole portion  64  of the aft-body  61 . The heel lateral section  80  is attached to the sole portion  64 , both the ribbon section  90  and the bottom section  91 , as explained in greater detail below. The heel lateral section  80  extends inward a distance, d, from the perimeter  73  a distance of 0.2 inch to 1.2 inch, more preferably 0.40 inch to 1.0 inch, and most preferably 0.8 inch. The heel lateral section  80  is preferably straight at its edge. 
   At the other end of the face component  60  is the toe lateral section  82 . The toe lateral section  82  is preferably attached to the sole  64 , both the ribbon  90  and the bottom section  91 , as explained in greater detail below. The toe lateral section  82  extends inward a distance, d, from the perimeter  73  a distance of 0.2 inch to 1.2 inch, more preferably 0.40 inch to 1.0 inch, and most preferably 0.8 inch. The toe lateral section  82  preferably is preferably straight at its edge. 
   The lower lateral section  78  extends inward, toward the aft-body  61 , a distance, d, to engage the sole portion  64 . In a preferred embodiment, the distance d ranges from 0.2 inch to 1.2 inch, more preferably 0.40 inch to 1.0 inch, and most preferably 0.8 inch, as measured from the perimeter  73  of the striking plate portion  72  to the edge of the lower lateral section  78 . 
   The aft-body  61  is preferably composed of a non-metal material, preferably a composite material such as continuous fiber pre-preg material (including thermosetting materials or a thermoplastic materials for the resin). Other materials for the aft-body  61  include other thermosetting materials or other thermoplastic materials such as injectable plastics. Alternatively, the aft-body  61  is composed of low-density metal materials, such as magnesium or aluminum. Exemplary magnesium alloys are available from Phillips Plastics Corporation under the brands AZ-91-D (nominal composition of magnesium with aluminum, zinc and manganese), AM-60-B (nominal composition of magnesium with aluminum and manganese) and AM-50-A (nominal composition of magnesium with aluminum and manganese). The aft-body  61  is preferably manufactured through metal-injection-molding. Alternatively, the aft-body  61  is manufactured through casting, forming, machining, powdered metal forming, electro chemical milling, and the like. 
   The aft-body  61  is preferably manufactured through bladder-molding, resin transfer molding, resin infusion, injection molding, compression molding, or a similar process. In a preferred process, the face component  60 , with an adhesive on the interior surface of the return portion  74 , is placed within a mold with a preform of the aft-body  61  for bladder molding. Such adhesives include thermosetting adhesives in a liquid or a film medium. A preferred adhesive is a two part liquid epoxy sold by 3M of Minneapolis Minn. under the brand names DP420NS and DP460NS. Other alternative adhesives include modified acrylic liquid adhesives such as DP810NS, also sold by the 3M company. Alternatively, foam tapes such as Hysol Synspan may be utilized with the present invention. 
   A bladder is placed within the hollow interior of the preform and face component  60 , and is pressurized within the mold, which is also subject to heating. The co-molding process secures the aft-body  61  to the face component  60 . Alternatively, the aft-body  61  is bonded to the face component  60  using an adhesive, or mechanically secured to the return portion  74 . 
   The crown portion  62  of the aft-body  61  is generally convex toward the sole  64 , and engages the ribbon section  90  of sole portion  64  outside of the engagement with the face member  60 . The crown portion  62  preferably has a thickness in the range of 0.010 to 0.100 inch, more preferably in the range of 0.025 inch to 0.070 inch, even more preferably in the range of 0.028 inch to 0.040 inch, and most preferably has a thickness of 0.033 inch. The sole portion  64 , including the bottom section  91  and the optional ribbon section  90 , which is substantially perpendicular to the bottom section  91 , preferably has a thickness in the range of 0.010 to 0.100 inch, more preferably in the range of 0.025 inch to 0.070 inch, even more preferably in the range of 0.028 inch to 0.040 inch, and most preferably has a thickness of 0.033 inch. In a preferred embodiment, the aft-body  61  is composed of a plurality of plies of pre-preg, typically six or seven plies, such as disclosed in U.S. Pat. No. 6,248,025, entitled Composite Golf Head And Method Of Manufacturing, which is hereby incorporated by reference in its entirety. 
   The hosel  54  is preferably at least partially disposed within the hollow interior of the club head  42 , and is preferably located as a part of the face component  60 . The hosel  54  is preferably composed of a similar material to the face component  60 , and is preferably secured to the face component  60  through welding or the like. Alternatively, the hosel  54  may be formed with the formation of the face component  60 . 
   In a preferred embodiment, a weight member  122  is preferably positioned on the aft body  61  to increase the moment of inertia of the club head  42 , to influence the center of gravity, or influence other inherent properties of the golf club head  42 . The weight member  122  is preferably composed of tungsten loaded film, tungsten doped polymers, or similar weighting mechanisms such as described in U.S. Pat. No. 6,386,990, filed on Dec. 29, 1999, entitled A Composite Golf Club Head With An Integral Weight Strip, and hereby incorporated by reference in its entirety. Those skilled in the pertinent art will recognize that other high density materials, such as lead-free pewter, may be utilized as an optional weight without departing from the scope and spirit of the present invention. 
   In a preferred embodiment two weight members  122   a  and  122   b  are embedded within the plies of pre-preg of the ribbon section  90  of the sole portion  64  of the aft-body  61 . Individually, each of weight  122  has a mass ranging from 5 grams to 30 grams. Each weight  122  is preferably composed of a material that has a density ranging from 5 grams per cubic centimeters to 20 grams per cubic centimeters, more preferably from 7 grams per cubic centimeters to 12 grams per cubic centimeters. 
   Each weight  122  is preferably composed of a polymer material integrated with a metal material. The metal material is preferably selected from copper, tungsten, steel, aluminum, tin, silver, gold, platinum, or the like. A preferred metal is tungsten due to its high density. The polymer material is a thermoplastic or thermosetting polymer material. A preferred polymer material is polyurethane, epoxy, nylon, polyester, or similar materials. A most preferred polymer material is a thermoplastic polyurethane. A preferred weight  122  is an injection molded thermoplastic polyurethane integrated with tungsten to have a density of 8.0 grams per cubic centimeters. In a preferred embodiment, each weight  122  is composed of from 50 to 95 volume percent polyurethane and from 50 to 5 volume percent tungsten. Also, in a preferred embodiment, each weight  122  is composed of from 10 to 25 weight percent polyurethane and from 90 to 75 weight percent tungsten. 
   Preferably, the weights  122   a - b  are positioned in the aft-heel corner and the aft-toe corner of the golf club head  42  generally corresponding to the aft-heel edge point  150  and the aft-toe edge point  155 . Those skilled in the pertinent art will recognize that other weighting materials may be utilized for the weight  122  without departing from the scope and spirit of the present invention. The placement of the weights  122  allows for the moment of inertia of the golf club head  42  to be optimized. 
   As shown in  FIGS. 40-42 , the face component has a striking plate portion  72  with varying thickness wherein portion  72   a  is thicker than  72   b  which is thicker than  72   c . In a preferred embodiment, the striking plate portion  72  has a varying thickness such as described in U.S. Pat. No. 6,398,666, for a Golf Club Striking Plate With Variable Thickness, which pertinent parts are hereby incorporated by reference. Other alternative embodiments of the thickness of the striking plate portion  72  are disclosed in U.S. Pat. No. 6,471,603, for a Contoured Golf Club Face and U.S. Pat. No. 6,368,234, for a Golf Club Striking Plate Having Elliptical Regions Of Thickness, which are both owned by Callaway Golf Company and which pertinent parts are hereby incorporated by reference. Alternatively, the striking plate portion  72  has a uniform thickness. 
   As mentioned previously, the face component  60  is preferably forged from a rod of metal material. One preferred forging process for manufacturing the face component is set forth in U.S. Pat. No. 6,440,011, filed on Apr. 13, 2000, entitled Method For Processing A Striking Plate For A Golf Club Head, and hereby incorporated by reference in its entirety. Alternatively, the face component  60  is cast from molten metal in a method such as the well-known lost-wax casting method. The metal for forging or casting is preferably titanium or a titanium alloy such as 6-4 titanium alloy, alpha-beta titanium alloy or beta titanium alloy for forging, and 6-4 titanium for casting. 
   Additional methods for manufacturing the face component  60  include forming the face component  60  from a flat sheet of metal, super-plastic forming the face component  60  from a flat sheet of metal, machining the face component  60  from a solid block of metal, electrochemical milling the face from a forged pre-form, and like manufacturing methods. Yet further methods include diffusion bonding titanium sheets to yield a variable face thickness face and then superplastic forming. 
   Alternatively, the face component  60  is composed of an amorphous metal material such as disclosed in U.S. Pat. No. 6,471,604, which was filed on Apr. 4, 2002 and is hereby incorporated by reference in its entirety. 
   An alternative embodiment of a club head  42  with a face component  60  and aft-body  61  is shown in  FIGS. 22-27 . In this embodiment, the club head  42  has a plurality of external weights  122   a ′ and  122   b ′ positioned on the aft-body  61 . 
   Another alternative embodiment of a club head  42  with a face component  60  and aft-body  61  is shown in  FIGS. 28-33 . Yet another alternative embodiment of a club head  42  with a face component  60  and aft-body  61  is shown in  FIGS. 34-39 . In this embodiment, the bottom section  91  of the sole portion  64  has a sole inward curvature  333  which creates a first keel point  275  and a second keel point  277  of the club head  42 . 
   In an alternative embodiment of the golf club head  42  of  FIGS. 1-7 , the body  43  has a front wall with an opening in which a striking plate  72 ′ is preferably disposed within the opening. The body  43  is preferably composed of a non-metal material, preferably a composite material such as a continuous fiber pre-preg material (including thermosetting materials or thermoplastic materials for the resin). Other materials for the body  43  include other thermosetting materials or other thermoplastic materials such as injectable plastics. Further, other materials for the body  43  include magnesium alloys, aluminum alloys, magnesium, aluminum or other low density metals. The body  43  is preferably manufactured through bladder-molding, resin transfer molding, resin infusion, injection molding, compression molding, or a similar process. 
   The striking plate insert  72 ′ is attached to the body  43  over the opening of the front wall of the body  43 . The striking plate insert  72 ′ is preferably composed of a formed metal material. Alternatively the striking plate insert  72 ′ is composed of a machined metal material, a forged metal material, a cast metal material or the like. The striking plate insert  72 ′ preferably is composed of a formed titanium or steel material. A preferred material is steel 4340, which is heat treated and then coated with a titanium nitride. Titanium materials useful for the striking plate insert  40  include pure titanium and titanium alloys such as 6-4 titanium alloy, SP-700 titanium alloy (available from Nippon Steel of Tokyo, Japan), DAT 55G titanium alloy available from Diado Steel of Tokyo, Japan, Ti 10-2-3 Beta-C titanium alloy available from RTI International Metals of Ohio, and the like. Other metals for the striking plate insert  40  include other high strength steel alloy metals and amorphous metals. Such steel materials include 17-4PH, Custom 450, 455, 465 and 465+ stainless steels, AERMET 100 and AERMET 310 alloy steels, all available from Carpenter Specialty Alloys, of Pennsylvania, and C35 maraging steels available from Allvac of North Carolina. Such amorphous metals include beryllium based alloys such as disclosed in U.S. Pat. No. 5,288,344, which pertinent parts are hereby incorporated by reference, quinary metallic glass alloys such as disclosed in U.S. Pat. No. 5,735,975, which pertinent parts are hereby incorporated by reference, and ternary alloys as disclosed in  Calculations of Amorphous - Forming Composition Range For Ternary Alloy Systems And Analyses Of Stabilization Of Amorphous Phase And Amorphous - Forming Ability, Takeuchi and Inoue , Materials Transactions, Vol. 42, No. 7, p 1435-1444 (2001), which pertinent parts are hereby incorporated by reference. 
   The striking plate insert  72 ′ is preferably co-molded with a body  43  or press-fitted into the opening subsequent to fabrication of the body  43 . In another attachment process, the body  43  is first bladder molded and then the striking plate insert  72 ′ is bonded to a recessed portion of the front wall using an adhesive. The adhesive is placed on the exterior surface of the recessed portion. Such adhesives include thermosetting adhesives in a liquid or a film medium. A preferred adhesive is a two part liquid epoxy sold by 3M of Minneapolis Minn. under the brand names DP420NS and DP460NS. Other alternative adhesives include modified acrylic liquid adhesives such as DP810NS, also sold by the 3M company. Alternatively, foam tapes such as Hysol Synspan may be utilized with the present invention. 
   Yet another embodiment of the golf club head  42  shown in  FIGS. 1-7 , the body  43  is preferably composed of a metal material such as titanium, titanium alloy, or the like, and is most preferably composed of a cast titanium alloy material. 
   The body  43  is preferably cast from molten metal in a method such as the well-known lost-wax casting method. The metal for casting is preferably titanium or a titanium alloy such as 6-4 titanium alloy, alpha-beta titanium alloy or beta titanium alloy for forging, and 6-4 titanium for casting. Alternatively, the body  43  is composed of 17-4 steel alloy. Additional methods for manufacturing the body  43  include forming the body  43  from a flat sheet of metal, super-plastic forming the body  43  from a flat sheet of metal, machining the body  43  from a solid block of metal, electrochemical milling the body from a forged pre-form, casting the body using centrifugal casting, casting the body using levitation casting, and like manufacturing methods. 
   The golf club head  42  of this embodiment optionally has a front wall with an opening for placement of a striking plate insert  72 ′ such as disclosed in U.S. Pat. No. 6,902,497 for A Golf Club Head With A Face Insert. The striking plate insert  72 ′ preferably is composed of a formed titanium alloy material. Such titanium materials include titanium alloys such as 6-22-22 titanium alloy and Ti 10-2-3 alloy, Beta-C titanium alloy, all available from RTI International Metals of Ohio, SP-700 titanium alloy (available from Nippon Steel of Tokyo, Japan), DAT 55G titanium alloy available from Diado Steel of Tokyo, Japan, and like materials. The preferred material for the striking plate insert  72 ′ is a heat treated 6-22-22 titanium alloy which is a titanium alloy composed by weight of titanium, 6% aluminum, 2% tin, 2% chromium, 2% molybdenum, 2% zirconium and 0.23% silicon. The titanium alloy will have an alpha phase in excess of 40% of the overall microstructure. 
   In a preferred embodiment, the striking plate insert  72 ′ has uniform thickness that ranges from 0.040 inch to 0.250 inch, more preferably a thickness of 0.080 inch to 0.120 inch, and is most preferably 0.108 inch for a titanium alloy striking plate insert  72 ′. 
   In yet another embodiment for the golf club head  42  shown in  FIGS. 1-7 , the golf club head has a construction with a crown composed of plies of pre-preg material such as disclosed in U.S. Pat. No. 6,575,845, for a Multiple Material Golf Club Head, which pertinent parts are hereby incorporated by reference. 
   In yet another embodiment, the golf club head  42  has a shape as disclosed, particularly as shown in  FIGS. 1-7 , and a construction with a body composed of plies of pre-preg material such as disclosed in U.S. Pat. No. 6,607,452, for a High Moment Of Inertia Composite Golf Club Head, which pertinent parts are hereby incorporated by reference. 
   In a preferred embodiment, the golf club head  42  has a high coefficient of restitution thereby enabling for greater distance of a golf ball hit with the golf club  40 . The coefficient of restitution (also referred to herein as “COR”) is determined by the following equation: 
           e   =         v   2     -     v   1           U   1     -     U   2               
wherein U 1  is the club head velocity prior to impact; U 2  is the golf ball velocity prior to impact which is zero; v 1  is the club head velocity just after separation of the golf ball from the face of the club head; v 2  is the golf ball velocity just after separation of the golf ball from the face of the club head; and e is the coefficient of restitution between the golf ball and the club face.
 
   The values of e are limited between zero and 1.0 for systems with no energy addition. The coefficient of restitution, e, for a material such as a soft clay or putty would be near zero, while for a perfectly elastic material, where no energy is lost as a result of deformation, the value of e would be 1.0. The present invention provides a club head having a coefficient of restitution ranging from 0.81 to 0.94, as measured under conventional test conditions. 
   The coefficient of restitution of the club head  42  under standard USGA test conditions with a given ball ranges from approximately 0.81 to 0.94, preferably ranges from 0.825 to 0.883 and is most preferably 0.845. 
   Additionally, the striking plate portion  72  of the face component  60  has a more rectangular face providing a greater aspect ratio. The aspect ratio as used herein is defined as the width, “W”, of the face divided by the height, “H”, of the face. In one preferred embodiment, the width W is 100 millimeters and the height H is 56 millimeters giving an aspect ratio of 1.8. The striking plate portion  72  of the present invention preferably has an aspect ratio that is greater than 1.8 for a club head having a volume greater than 420 cubic centimeters. 
   The face area of the striking plate portion  72  preferably ranges from 5.00 square inches to 10.0 square inches, more preferably from 6.0 square inches to 9.5 square inches, and most preferably from 7.0 square inches to 9.0 square inches. 
     FIGS. 23 and 26  illustrate the axes of inertia through the center of gravity of the golf club head. The axes of inertia are designated X, Y and Z. The X-axis extends from the striking plate portion  72  through the center of gravity, CG, and to the rear of the golf club head  42 . The Y-axis extends from the toe end  68  of the golf club head  42  through the center of gravity, CG, and to the heel end  66  of the golf club head  42 . The Z-axis extends from the crown portion  62  through the center of gravity, CG, and through the sole portion  64 . 
   As defined in  Golf Club Design, Fitting, Alteration  &amp;  Repair,  4 th  Edition, by Ralph Maltby, the center of gravity, or center of mass, of the golf club head is a point inside of the club head determined by the vertical intersection of two or more points where the club head balances when suspended. A more thorough explanation of this definition of the center of gravity is provided in  Golf Club Design, Fitting, Alteration  &amp;  Repair.    
   The center of gravity and the moment of inertia of a golf club head  42  are preferably measured using a test frame (X T , Y T , Z T ), and then transformed to a head frame (X H , Y H , Z H ). The center of gravity of a golf club head may be obtained using a center of gravity table having two weight scales thereon, as disclosed in U.S. Pat. No. 6,607,452, entitled High Moment Of Inertia Composite Golf Club, and hereby incorporated by reference in its entirety. If a shaft is present, it is removed and replaced with a hosel cube that has a multitude of faces normal to the axes of the golf club head. Given the weight of the golf club head, the scales allow one to determine the weight distribution of the golf club head when the golf club head is placed on both scales simultaneously and weighed along a particular direction, the X, Y or Z direction. Those skilled in the pertinent art will recognize other methods to determine the center of gravity and moments of inertia of a golf club head. 
   In general, the moment of inertia, Izz, about the Z axis for the golf club head  42  of the present invention will range from 3500 g-cm 2  to 6000 g-cm 2 , preferably from 4000 g-cm 2  to 5000 g-cm 2 , and most preferably from 4200 g-cm 2  to 4750 g-cm 2 . The moment of inertia, Iyy, about the Y axis for the golf club head  42  of the present invention will range from 2000 g-cm 2  to 4000 g-cm 2 , preferably from 2500 g-cm 2  to 3500 g-cm 2 , and most preferably from 2900 g-cm 2  to 3300 g-cm 2 . The moment of inertia, Ixx, about the X axis for the golf club head  42  of the present invention will range from 2000 g-cm 2  to 4000 g-cm 2 , preferably from 2500 g-cm 2  to 3750 g-cm 2 , and most preferably from 3000 g-cm 2  to 3500 g-cm 2 . 
   In general, the golf club head  42  has products of inertia such as disclosed in U.S. Pat. No. 6,425,832, which was filed on Jul. 26, 2001 and is hereby incorporated by reference in its entirety. Preferably, each of the products of inertia, Ixy, Ixz and Iyz, of the golf club head  42  have an absolute value less than 100 grams-centimeter squared. Alternatively, at least two of the products of inertia, Ixy, Ixz or Iyz, of the golf club head  42  have an absolute value less than 100 grams-centimeter squared. 
     FIGS. 17-21  illustrate the substantial straightness of the heel wall  166 , the toe wall  168  and the rear wall  170  of the club head  42 . In a preferred embodiment, at least 50% of the length of the heel wall  166  extends rearward from the perimeter  73  of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the striking plate portion  72 . For example, in  FIG. 18 , line  502  represents a plane parallel to the farthest extent of the striking plate portion  72  and line  503  is at an angle of 90 degrees relative to line  502 . Shown in a dashed line is a line at 80 degrees relative to line  502 . In a more preferred embodiment, at least 66% of the length of the heel wall  166  extends rearward from the perimeter  73  of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the striking plate portion  72 . In yet an even more preferred embodiment, at least 75% of the length of the heel wall  166  extends rearward from the perimeter  73  of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the striking plate portion  72 . In yet a further more preferred embodiment, at least 90% of the length or even at least 95% of the length of the heel wall  166  extends rearward from the perimeter  73  of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the striking plate portion  72 . Further, 50% to 95% of the length of the heel wall  166  preferably extends rearward from the perimeter  73  of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the striking plate portion  72 , more preferably 66% to 80%. 
   In a preferred embodiment, at least 50% of the length of the toe wall  168  extends rearward from the perimeter  73  of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the striking plate portion  72 . For example, in  FIG. 20 , line  504  represents a plane parallel to the farthest extent of the striking plate portion  72  and line  504  is at an angle of 90 degrees relative to line  504 . Shown in a dashed line is a line at 80 degrees relative to line  502 . In a more preferred embodiment, at least 66% of the length of the toe wall  168  extends rearward from the perimeter  73  of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the striking plate portion  72 . In yet an even more preferred embodiment, at least 75% of the length of the toe wall  168  extends rearward from the perimeter  73  of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the striking plate portion  72 . In yet a further more preferred embodiment, at least 90% of the length or even at least 95% of the length of the toe wall  168  extends rearward from the perimeter  73  of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the striking plate portion  72 . Further, 50% to 95% of the length of the toe wall  168  preferably extends rearward from the perimeter  73  of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the striking plate portion  72 , more preferably 66% to 80%. 
   In a preferred embodiment, at least 50% of the length of the rear wall  170  extends substantially parallel with a farthest extent of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the heel wall  166 . For example, in  FIG. 17 , line  501  represents a plane parallel to the farthest extent of the heel wall  166  and line  500  is at an angle of 90 degrees relative to line  501 . Shown in a dashed line is a line at 80 degrees relative to line  501  and a line at 60 degrees relative to line  501 . In a more preferred embodiment, at least 66% of the length of the rear wall  170  extends substantially parallel with a farthest extent of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the heel wall  166 . In yet an even more preferred embodiment, at least 75% of the length of the rear wall  170  extends substantially parallel with a farthest extent of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the heel wall  166 . In yet a further more preferred embodiment, at least 90% of the length of the heel wall  170  extends substantially parallel with a farthest extent of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the heel wall  166 . Further, 50% to 95% of the length of the rear wall  170  preferably extends substantially parallel with a farthest extent of the striking plate portion  72  within an angle of 80 degrees to 90 degrees relative to a plane parallel to the farthest extent of the heel wall  166 , more preferably 66% to 80%. 
   As shown in  FIG. 21 , a distance “Dmh” from the center of gravity, CG, of the club head  42  to an aft-heel edge point  150  ranges from 1.0 inches to 3.5 inches, and more preferably from 2.0 inches to 3.0 inches, and is most preferably 2.25 inches. A distance “Dmt” from the geometric center to an aft-toe edge point  155  ranges from 1.75 inches to 4.0 inches, and more preferably from 2.5 inches to 3.75 inches, and is most preferably 3.25 inches. In a preferred embodiment, the distance Dmt is the farthest distance of any point on the club head  42  from the center of gravity of the club head  42 . Further, with a weighting member  122   b  positioned at about aft-toe edge point  155 , the weighting member  122   b  represents the greatest mass in the least volume the farthest away from the center of gravity of the club head  42 . 
   From the foregoing it is believed that those skilled in the pertinent art will recognize the meritorious advancement of this invention and will readily understand that while the present invention has been described in association with a preferred embodiment thereof, and other embodiments illustrated in the accompanying drawings, numerous changes, modifications and substitutions of equivalents may be made therein without departing from the spirit and scope of this invention which is intended to be unlimited by the foregoing except as may appear in the following appended claims. Therefore, the embodiments of the invention in which an exclusive property or privilege is claimed are defined in the following appended claims.