Golf club heads
A golf club head having discreet regions of specific mass relationships, including a lightweight forward portion, to achieve specific mass properties and performance.
1 . A golf club head, comprising:
a face, a sole, a crown, a hosel portion with a hosel bore defining a shaft axis, an adjustable head-shaft connection assembly coupled to the hosel portion and operable to adjust at least one of a loft angle or a lie angle formed when the golf club head is attached to a golf club shaft via the adjustable head-shaft connection assembly;
the golf club head has a head mass of 195-209 grams, a head volume of at least 410 cc, a center of gravity having a head origin y-axis CGy coordinate of 40-50 mm and a Zup value of 20-28 mm, a moment of inertia about a club head CG x-axis, Ixx, of 360-480 kg·mm 2 , and a moment of inertia about a golf club head CG z-axis, Izz, of 560-700 kg·mm 2 ;
wherein:
at least a portion of the face and a portion of the crown are formed of non-metallic material creating a non-metallic face portion and a non-metallic crown portion;
the face has a center face defining an origin for an origin x-axis, an origin y-axis, and an origin z-axis, wherein the origin x-axis is tangential to the face at the origin and parallel to a ground plane, the origin y-axis is perpendicular to the origin x-axis and extends away from the face and is parallel to the ground plane, and the origin z-axis extends vertically from face center and is perpendicular to the ground plane;
a face center vertical plane extends through center face and includes the origin y-axis and the origin z-axis;
a face center horizontal plane extends through a center face and is perpendicular to the face center vertical plane;
a shaft axis vertical plane is parallel to the face center vertical plane and includes the shaft axis;
a 1F vertical plane is parallel to the shaft axis vertical plane and offset 10 mm forward of the shaft axis vertical plane, and a 2F vertical plane is parallel to the shaft axis vertical plane and offset 20 mm forward of the shaft axis vertical plane;
a 1R vertical plane is parallel to the shaft axis vertical plane and offset 10 mm rearward of the shaft axis vertical plane, a 2R vertical plane is parallel to the shaft axis vertical plane and offset 20 mm rearward of the shaft axis vertical plane, a 3R vertical plane is parallel to the shaft axis vertical plane and offset 30 mm rearward of the shaft axis vertical plane, a 4R vertical plane is parallel to the shaft axis vertical plane and offset 40 mm rearward of the shaft axis vertical plane, a 5R vertical plane is parallel to the shaft axis vertical plane and offset 50 mm rearward of the shaft axis vertical plane, a 6R vertical plane is parallel to the shaft axis vertical plane and offset 60 mm rearward of the shaft axis vertical plane, a 7R vertical plane is parallel to the shaft axis vertical plane and offset 70 mm rearward of the shaft axis vertical plane, a 8R vertical plane is parallel to the shaft axis vertical plane and offset 80 mm rearward of the shaft axis vertical plane, a 9R vertical plane is parallel to the shaft axis vertical plane and offset 90 mm rearward of the shaft axis vertical plane, and a 10R vertical plane is parallel to the shaft axis vertical plane and offset 100 mm rearward of the shaft axis vertical plane;
a 1T vertical plane is parallel to the face center vertical plane and offset 10 mm toeward of the face center vertical plane, a 2T vertical plane is parallel to the face center vertical plane and offset 20 mm toeward of the face center vertical plane, a 3T vertical plane is parallel to the face center vertical plane and offset 30 mm toeward of the face center vertical plane, a 4T vertical plane is parallel to the face center vertical plane and offset 40 mm toeward of the face center vertical plane, a 5T vertical plane is parallel to the face center vertical plane and offset 50 mm toeward of the face center vertical plane, a 6T vertical plane is parallel to the face center vertical plane and offset 60 mm toeward of the face center vertical plane, a 7T vertical plane is parallel to the face center vertical plane and offset 70 mm toeward of the face center vertical plane, and a 8T vertical plane is parallel to the face center vertical plane and offset 80 mm toeward of the face center vertical plane;
a 1H vertical plane is parallel to the face center vertical plane and offset 10 mm heelward of the face center vertical plane, a 2H vertical plane is parallel to the face center vertical plane and offset 20 mm heelward of the face center vertical plane, a 3H vertical plane is parallel to the face center vertical plane and offset 30 mm heelward of the face center vertical plane, a 4H vertical plane is parallel to the face center vertical plane and offset 40 mm heelward of the face center vertical plane, a 5H vertical plane is parallel to the face center vertical plane and offset 50 mm heelward of the face center vertical plane, a 6H vertical plane is parallel to the face center vertical plane and offset 60 mm heelward of the face center vertical plane, a 7H vertical plane is parallel to the face center vertical plane and offset 70 mm heelward of the face center vertical plane, and a 8H vertical plane is parallel to the face center vertical plane and offset 80 mm heelward of the face center vertical plane;
a 1C horizontal plane is parallel to the face center horizontal plane and offset 10 mm above the face center horizontal plane, a 2C horizontal plane is parallel to the face center horizontal plane and offset 20 mm above the face center horizontal plane, a 3C horizontal plane is parallel to the face center horizontal plane and offset 30 mm above the face center horizontal plane, and a 4C horizontal plane is parallel to the face center horizontal plane and offset 40 mm above the face center horizontal plane;
a 1S horizontal plane is parallel to the face center horizontal plane and offset 10 mm below the face center horizontal plane, and a 2S horizontal plane is parallel to the face center horizontal plane and offset 20 mm below the face center horizontal plane;
a post-10R mass is a mass of a portion of the golf club head behind the 10R vertical plane;
a pre-1F mass is a mass of a portion of the golf club head located forward of the 1F vertical plane;
a 2T-2H, post-9R mass is a mass of a portion of the golf club head (a) behind the 9R vertical plane, and (b) between the 2T vertical plane and the 2H vertical plane;
a 4T-4H, 1S-4C, pre-2R mass is a mass of a portion of the golf club head (a) in front of the 2R vertical plane, (b) between the 4T vertical plane and the 4H vertical plane, and (c) between the 1S horizontal plane and the 4C horizontal plane;
a mid-section mass is a mass of a portion of the golf club head between the 8R vertical plane and the 3R vertical plane;
a forward heel and toe mass is a sum of:
a mass of a portion of the golf club head (a) in front of the 2R vertical plane, (b) between the 4H vertical plane and the 8H vertical plane, and (c) between the 1S horizontal plane and the 4C horizontal plane; and
a mass of a portion of the golf club head (a) in front of the 2R vertical plane, (b) between the 4T vertical plane and the 8T vertical plane, and (c) between the 1S horizontal plane and the 4C horizontal plane;
a rear-center-to-forward-center mass ratio is a ratio of the 2T-2H, post-9R mass to the 4T-4H, 1S-4C, pre-2R mass, and the rear-center-to-forward-center mass ratio is 1.05-1.85;
a center-forward-to-mid-section mass ratio is a ratio of the 4T-4H, 1S-4C, pre-2R mass to the mid-section mass, and the center-forward-to-mid-section mass ratio is 0.8-1.3;
a forward-HT-to-mid-section mass ratio is a ratio of the forward heel and toe mass to the mid-section mass, and the forward-HT-to-mid-section mass ratio is 0.8-1.3;
a rear-center-to-mid-section mass ratio is a ratio of the 2T-2H, post-9R mass to the mid-section mass, and the rear-center-to-mid-section mass ratio is 1.05-1.85; and
the post-10R mass is at least 20% of the pre-1F mass.
2 . The golf club head of claim 1 , wherein the rear-center-to-forward-center mass ratio is at least 1.1, and the forward-HT-to-mid-section mass ratio is no more than 1.25.
3 . The golf club head of claim 2 , wherein the rear-center-to-mid-section mass ratio is at least 1.1, and the rear-center-to-forward-center mass ratio is no more than 1.8.
4 . The golf club head of claim 3 , wherein the center-forward-to-mid-section mass ratio is no more than 1.25, and the forward-HT-to-mid-section mass ratio is at least 0.85.
5 . The golf club head of claim 4 , wherein the center-forward-to-mid-section mass ratio is at least 0.85, and the post-10R mass is no more than 50% of the pre-1F mass.
6 . The golf club head of claim 5 , wherein the rear-center-to-mid-section mass ratio is no more than 1.8, the 2T-2H, post-9R mass is 32.5-52.5 grams, and the mid-section mass is no more than 50% of a pre-SAVP mass, where the pre-SAVP mass is a mass of a portion of the golf club head located forward of the shaft axis vertical plane.
7 . The golf club head of claim 6 , wherein the mid-section mass is less than 36 grams, the center-forward-to-mid-section mass ratio is 0.9-1.2, the 4T-4H, 1S-4C, pre-2R mass is less than 36 grams, the forward heel and toe mass is less than 36 grams, and the pre-1F mass is at least 4 grams and less than 22.5 grams.
8 . The golf club head of claim 7 , wherein the forward-HT-to-mid-section mass ratio is 0.9-1.2, and at least a portion of the sole is formed of a non-metallic material.
9 . The golf club head of claim 7 , wherein the golf club head includes a metallic front body portion having a density less than 3 g/cc and having a front opening that is closed by the non-metallic face portion.
10 . The golf club head of claim 7 , wherein a 6R-5R mass is a mass of a portion of the golf club head between the 6R vertical plane and the 5R vertical plane, a 5R-4R mass is a mass of a portion of the golf club head between the 5R vertical plane and the 4R vertical plane, a 4R-3R mass is a mass of a portion of the golf club head between the 4R vertical plane and the 3R vertical plane, the 6R-5R mass is within 20% of the 5R-4R mass, and the 4R-3R mass is within 20% of the 5R-4R mass.
11 . The golf club head of claim 10 , wherein a 8R-7R mass is a mass of a portion of the golf club head between the 8R vertical plane and the 7R vertical plane, a 7R-6R mass is a mass of a portion of the golf club head between the 7R vertical plane and the 6R vertical plane, and the 7R-6R mass is within 10% of the 8R-7R mass.
12 . The golf club head of claim 11 , wherein the portion of the golf club head between the 4R vertical plane and the 3R vertical plane has a maximum 4R-3R section width, the portion of the golf club head between the 8R vertical plane and the 7R vertical plane has a minimum 8R-7R section width, and the maximum 4R-3R section width is at least 20% greater than the minimum 8R-7R section width.
13 . The golf club head of claim 12 , wherein the portion of the golf club head between the 4R vertical plane and the 3R vertical plane has a maximum 4R-3R section height, the portion of the golf club head between the 8R vertical plane and the 7R vertical plane has a minimum 8R-7R section height, and the maximum 4R-3R section height is at least 20% greater than the minimum 8R-7R section height.
14 . The golf club head of claim 13 , wherein the maximum 4R-3R section height is no more than 50% greater than the minimum 8R-7R section height, and the maximum 4R-3R section width is no more than 40% greater than the minimum 8R-7R section width.
15 . The golf club head of claim 7 , wherein the 4T-4H, 1S-4C, pre-2R mass is less than 28 grams, the forward heel and toe mass is less than 28 grams, and the pre-1F mass is less than 20 grams.
16 . The golf club head of claim 7 , wherein the post-10R mass is 25-45% of the pre-1F mass.
17 . The golf club head of claim 7 , wherein a pre-SAVP central-4 array mass is a mass of a portion of the golf club head located (a) in front of the shaft axis vertical plane, (b) between the 1T vertical plane and the 1H vertical plane, and (c) between the 1S horizontal plane and the 1C horizontal plane, and the post-10R mass is at least 150% of the pre-SAVP central-4 array mass.
18 . The golf club head of claim 17 , wherein the post-10R mass is at least 200% of the pre-SAVP central-4 array mass, and the pre-1F mass is at least 7 grams and less than 17.5 grams.
19 . The golf club head of claim 7 , wherein the golf club head includes a metallic front body portion and a rear ring portion attached to the metallic front body portion and forming a crown opening and a sole opening, wherein a composite crown panel covers the crown opening, a composite sole panel covers the sole opening, the metallic front body portion has a front opening that is closed by the non-metallic face portion, the pre-SAVP mass is less than 69 grams, the metallic front body portion is formed of aluminum alloy, and further including a rear weight having a density of at least 7 g/cc attached to the rear ring portion and extending behind the 10R vertical plane.
20 . The golf club head of claim 19 , further including a forward weight attached to the metallic front body portion and extending forward of the 2R vertical plane.
21 . The golf club head of claim 4 , wherein the head mass is no more than 208 grams, the CGy coordinate is 42-48 mm, the Zup value is no more than 27 mm, the Ixx is at least 370 kg·mm 2 , and further including a rear weight having a density of at least 7 g/cc and extending behind the 10R vertical plane.
22 . The golf club head of claim 21 , further including a forward weight attached to the golf club head and extending forward of the 2R vertical plane.
23 . The golf club head of claim 1 , wherein the golf club head includes a metallic front body portion and an aluminum rear ring portion attached to the metallic front body portion and forming a crown opening, wherein a composite crown panel covers the crown opening, and the metallic front body portion has a front opening that is closed by the non-metallic face portion.
24 . The golf club head of claim 23 , further including a rear weight having a density of at least 7 g/cc and attached to the aluminum rear ring portion and extending behind the 10R vertical plane.
25 . The golf club head of claim 24 , wherein the pre-SAVP mass is less than 69 grams and the metallic front body portion is formed of aluminum alloy.
26 . The golf club head of claim 25 , further including a forward weight attached to the metallic front body portion and extending forward of the 2R vertical plane.
27 . A golf club head, comprising:
a face, a sole, a crown, a hosel portion with a hosel bore defining a shaft axis, an adjustable head-shaft connection assembly coupled to the hosel portion and operable to adjust at least one of a loft angle or a lie angle formed when the golf club head is attached to a golf club shaft via the adjustable head-shaft connection assembly;
the golf club head has a head mass of 195-209 grams, a head volume of at least 410 cc, a center of gravity having a head origin y-axis CGy coordinate of 40-50 mm and a Zup value of 20-28 mm, a moment of inertia about a club head CG x-axis, Ixx, of 360-480 kg·mm 2 , and a moment of inertia about a golf club head CG z-axis, Izz, of 560-700 kg·mm 2 ;
wherein:
at least a portion of the crown is formed of non-metallic material;
the face has a center face defining an origin for an origin x-axis, an origin y-axis, and an origin z-axis, wherein the origin x-axis is tangential to the face at the origin and parallel to a ground plane, the origin y-axis is perpendicular to the origin x-axis and extends away from the face and is parallel to the ground plane, and the origin z-axis extends vertically from face center and is perpendicular to the ground plane;
a face center vertical plane extends through center face and includes the origin y-axis and the origin z-axis;
a face center horizontal plane extends through a center face and is perpendicular to the face center vertical plane;
a shaft axis vertical plane is parallel to the face center vertical plane and includes the shaft axis;
a 1F vertical plane is parallel to the shaft axis vertical plane and offset 10 mm forward of the shaft axis vertical plane, and a 2F vertical plane is parallel to the shaft axis vertical plane and offset 20 mm forward of the shaft axis vertical plane;
a 1R vertical plane is parallel to the shaft axis vertical plane and offset 10 mm rearward of the shaft axis vertical plane, a 2R vertical plane is parallel to the shaft axis vertical plane and offset 20 mm rearward of the shaft axis vertical plane, a 3R vertical plane is parallel to the shaft axis vertical plane and offset 30 mm rearward of the shaft axis vertical plane, a 4R vertical plane is parallel to the shaft axis vertical plane and offset 40 mm rearward of the shaft axis vertical plane, a 5R vertical plane is parallel to the shaft axis vertical plane and offset 50 mm rearward of the shaft axis vertical plane, a 6R vertical plane is parallel to the shaft axis vertical plane and offset 60 mm rearward of the shaft axis vertical plane, a 7R vertical plane is parallel to the shaft axis vertical plane and offset 70 mm rearward of the shaft axis vertical plane, a 8R vertical plane is parallel to the shaft axis vertical plane and offset 80 mm rearward of the shaft axis vertical plane, a 9R vertical plane is parallel to the shaft axis vertical plane and offset 90 mm rearward of the shaft axis vertical plane, and a 10R vertical plane is parallel to the shaft axis vertical plane and offset 100 mm rearward of the shaft axis vertical plane;
a 1T vertical plane is parallel to the face center vertical plane and offset 10 mm toeward of the face center vertical plane, a 2T vertical plane is parallel to the face center vertical plane and offset 20 mm toward of the face center vertical plane, a 3T vertical plane is parallel to the face center vertical plane and offset 30 mm toeward of the face center vertical plane, a 4T vertical plane is parallel to the face center vertical plane and offset 40 mm toeward of the face center vertical plane, a 5T vertical plane is parallel to the face center vertical plane and offset 50 mm toeward of the face center vertical plane, a 6T vertical plane is parallel to the face center vertical plane and offset 60 mm toeward of the face center vertical plane, a 7T vertical plane is parallel to the face center vertical plane and offset 70 mm toeward of the face center vertical plane, and a 8T vertical plane is parallel to the face center vertical plane and offset 80 mm toeward of the face center vertical plane;
a 1H vertical plane is parallel to the face center vertical plane and offset 10 mm heelward of the face center vertical plane, a 2H vertical plane is parallel to the face center vertical plane and offset 20 mm heelward of the face center vertical plane, a 3H vertical plane is parallel to the face center vertical plane and offset 30 mm heelward of the face center vertical plane, a 4H vertical plane is parallel to the face center vertical plane and offset 40 mm heelward of the face center vertical plane, a 5H vertical plane is parallel to the face center vertical plane and offset 50 mm heelward of the face center vertical plane, a 6H vertical plane is parallel to the face center vertical plane and offset 60 mm heelward of the face center vertical plane, a 7H vertical plane is parallel to the face center vertical plane and offset 70 mm heelward of the face center vertical plane, and a 8H vertical plane is parallel to the face center vertical plane and offset 80 mm heelward of the face center vertical plane;
a 1C horizontal plane is parallel to the face center horizontal plane and offset 10 mm above the face center horizontal plane, a 2C horizontal plane is parallel to the face center horizontal plane and offset 20 mm above the face center horizontal plane, a 3C horizontal plane is parallel to the face center horizontal plane and offset 30 mm above the face center horizontal plane, and a 4C horizontal plane is parallel to the face center horizontal plane and offset 40 mm above the face center horizontal plane;
a 1S horizontal plane is parallel to the face center horizontal plane and offset 10 mm below the face center horizontal plane, and a 2S horizontal plane is parallel to the face center horizontal plane and offset 20 mm below the face center horizontal plane;
a post-10R mass is a mass of a portion of the golf club head behind the 10R vertical plane;
a pre-1F mass is a mass of a portion of the golf club head located forward of the 1F vertical plane;
a 2T-2H, post-9R mass is a mass of a portion of the golf club head (a) behind the 9R vertical plane, and (b) between the 2T vertical plane and the 2H vertical plane;
a 4T-4H, 1S-4C, pre-2R mass is a mass of a portion of the golf club head (a) in front of the 2R vertical plane, (b) between the 4T vertical plane and the 4H vertical plane, and (c) between the 1S horizontal plane and the 4C horizontal plane;
a mid-section mass is a mass of a portion of the golf club head between the 8R vertical plane and the 3R vertical plane;
a 8R-7R mass is a mass of a portion of the golf club head between the 8R vertical plane and the 7R vertical plane;
a 7R-6R mass is a mass of a portion of the golf club head between the 7R vertical plane and the 6R vertical plane;
a large forward toe region mass is a mass of a portion of the golf club head located (a) between the 3R vertical plane and the 1F vertical plane, (b) between the 5T vertical plane and the 8T vertical plane, and (c) between the 3S horizontal plane and the 1C horizontal plane;
a limited heel region mass is a mass of a portion of the golf club head located (a) between the 3R vertical plane and the shaft axis vertical plane, (b) between the 4H vertical plane and the 6H vertical plane, and (c) between the 2S horizontal plane and the 1C horizontal plane;
a forward heel and toe mass is a sum of:
a mass of a portion of the golf club head (a) in front of the 2R vertical plane, (b) between the 4H vertical plane and the 8H vertical plane, and (c) between the 1S horizontal plane and the 4C horizontal plane; and
a mass of a portion of the golf club head (a) in front of the 2R vertical plane, (b) between the 4T vertical plane and the 8T vertical plane, and (c) between the 1S horizontal plane and the 4C horizontal plane;
a forward-HT-to-mid-section mass ratio is a ratio of the forward heel and toe mass to the mid-section mass, and the forward-HT-to-mid-section mass ratio is 0.8-1.3;
a rear-center-to-mid-section mass ratio is a ratio of the 2T-2H, post-9R mass to the mid-section mass, and the rear-center-to-mid-section mass ratio is 1.05-1.85;
a rear-center-to-forward-HT mass ratio is a ratio of the 2T-2H, post-9R mass to the forward heel and toe mass, and the rear-center-to-forward-HT mass ratio is 1.05-1.85;
the 7R-6R mass is within 20% of the 8R-7R mass; and
wherein a LHR-forward-toe mass ratio is a ratio of the large forward toe region mass to the limited heel region mass, and the LHR-forward-toe mass ratio is 0.9-1.3.
28 . The golf club head of claim 27 , wherein the rear-center-to-mid-section mass ratio is at least 1.1, and the forward-HT-to-mid-section mass ratio is no more than 1.25.
29 . The golf club head of claim 28 , wherein the rear-center-to-mid-section mass ratio is no more than 1.8, and the rear-center-to-forward-HT mass ratio is at least 1.1.
30 . The golf club head of claim 29 , wherein the forward-HT-to-mid-section mass ratio is at least 0.85, and the rear-center-to-forward-HT mass ratio is no more than 1.8.
31 . The golf club head of claim 30 , wherein a 6R-5R mass is a mass of a portion of the golf club head between the 6R vertical plane and the 5R vertical plane, a 5R-4R mass is a mass of a portion of the golf club head between the 5R vertical plane and the 4R vertical plane, and the 6R-5R mass is within 20% of the 5R-4R mass.
32 . The golf club head of claim 31 , wherein the portion of the golf club head between the 4R vertical plane and the 3R vertical plane has a maximum 4R-3R section height, the portion of the golf club head between the 8R vertical plane and the 7R vertical plane has a minimum 8R-7R section height, and the maximum 4R-3R section height is at least 20% greater than the minimum 8R-7R section height.
33 . The golf club head of claim 32 , wherein the portion of the golf club head between the 4R vertical plane and the 3R vertical plane has a maximum 4R-3R section width, the portion of the golf club head between the 8R vertical plane and the 7R vertical plane has a minimum 8R-7R section width, and the maximum 4R-3R section width is at least 20% greater than the minimum 8R-7R section width.
34 . The golf club head of claim 33 , wherein the maximum 4R-3R section width is no more than 40% greater than the minimum 8R-7R section width, and the maximum 4R-3R section height is no more than 50% greater than the minimum 8R-7R section height.
35 . The golf club head of claim 30 , wherein the CGy coordinate is 42-48 mm, the Ixx is at least 370 kg·mm 2 , and further including a rear weight having a density of at least 7 g/cc and extending behind the 10R vertical plane.
36 . The golf club head of claim 35 , further including a forward weight attached to the golf club head and extending forward of the 2R vertical plane.
37 . The golf club head of claim 35 , wherein a 4R-3R mass is a mass of a portion of the golf club head between the 4R vertical plane and the 3R vertical plane, a 5R-4R mass is a mass of a portion of the golf club head between the 5R vertical plane and the 4R vertical plane, the 4R-3R mass is within 20% of the 5R-4R mass, the LHR-forward-toe mass ratio is at least 1.0, the forward heel and toe mass is less than 36 grams, and the mid-section mass is less than 36 grams.
38 . The golf club head of claim 35 , wherein the mid-section mass is no more than 50% of a pre-SAVP mass, where the pre-SAVP mass is a mass of a portion of the golf club head located forward of the shaft axis vertical plane.
39 . The golf club head of claim 35 , wherein the large forward toe region mass is at least 14 grams, and the limited heel region mass is no more than 24 grams.
40 . The golf club head of claim 39 , wherein the large forward toe region mass is no more than 25 grams, the limited heel region mass is at least 14 grams, and the 2T-2H, post-9R mass is 32.5-52.5 grams.
41 . The golf club head of claim 35 , wherein the forward-HT-to-mid-section mass ratio is 0.9-1.2, and at least a portion of the sole is formed of a non-metallic material.
42 . The golf club head of claim 35 , wherein the golf club head includes a metallic front body portion formed of aluminum alloy and having a front opening that is closed by a portion of the face.
43 . The golf club head of claim 42 , wherein the forward heel and toe mass is less than 28 grams.
44 . The golf club head of claim 43 , wherein a portion of the face is adhesively bonded to the metallic front body portion.
45 . The golf club head of claim 42 , further including an aluminum rear ring portion attached to the metallic front body portion and forming a crown opening, wherein a composite crown panel covers the crown opening, and the rear weight is attached to the aluminum rear ring portion.
46 . The golf club head of claim 45 , further including a forward weight attached to the metallic front body portion and extending forward of the 2R vertical plane.