Multi-material aerodynamic golf club head
View Patent ↗A multi-material aerodynamic golf club head producing reduced aerodynamic drag forces via the curvature of a crown section. At least a portion of the crown section may be composed of low density materials, including nonmetallic materials.
1. An aerodynamic golf club head ( 100 ) comprising:
A) a hollow body ( 110 ) having a club head volume of at least 400 cc, a face ( 200 ), a sole section ( 300 ), a crown section ( 400 ), a front ( 112 ), a back ( 114 ), a heel ( 116 ), and a toe ( 118 );
B) the face ( 200 ) having a top edge ( 210 ) and a lower edge ( 220 ), wherein a top edge height (TEH) is the elevation of the top edge ( 210 ) above the ground plane (GP), and a maximum top edge height (TEH) is at least 2 inches; and
C) the crown section ( 400 ) having a crown apex ( 410 ) located an apex height (AH) above a ground plane (GP) and having an apex ratio of the apex height (AH) to the maximum top edge height (TEH) of at least 1.13, wherein:
(i) within a front-to-back vertical section through the crown apex ( 410 ) and perpendicular to a vertical plane created by a shaft axis (SA), a portion of the crown section ( 400 ) between the crown apex ( 410 ) and the face ( 200 ) has an apex-to-front radius of curvature (Ra-f), and a portion of the crown section ( 400 ) between the crown apex ( 410 ) and the back ( 114 ) of the hollow body ( 110 ) has an apex-to-rear radius of curvature (Ra-r),
(ii) within a heel-to-toe vertical section through the crown apex ( 410 ) and parallel to the vertical plane created by the shaft axis (SA), a portion of the crown section ( 400 ) above the top edge height (TEH) has a heel-to-toe radius of curvature (Rh-t); and
(iii) a portion of the crown section ( 400 ) has a density less than a portion of the sole section ( 300 ), and the crown section ( 400 ) has at least one of (a) the apex-to-front radius of curvature (Ra-f) in contact with the crown apex ( 410 ) of less than 3 inches, (b) a portion of the crown section ( 400 ) above the top edge height (TEH) with an apex-to-rear radius of curvature (Ra-r) that is less than 3.75 inches, and (c) an apex-to-rear radius of curvature (Ra-r) that is greater than 5 inches.
2. The aerodynamic golf club head ( 100 ) of claim 1 , wherein the crown section ( 400 ) at the crown apex ( 410 ) has a density less than a portion of the sole section ( 300 ).
3. The aerodynamic golf club head ( 100 ) of claim 1 , wherein a portion of the crown section ( 400 ) includes nonmetallic material.
4. The aerodynamic golf club head ( 100 ) of claim 1 , wherein the apex ratio is at least 1.25.
5. The aerodynamic golf club head ( 100 ) of claim 1 , wherein the hollow body ( 110 ) has a front-to-back dimension (FB) of at least 4.4 inches.
6. The aerodynamic golf club head ( 100 ) of claim 5 , wherein the front-to-back dimension (FB) of at least 4.6 inches.
7. The aerodynamic golf club head ( 100 ) of claim 1 , wherein the apex-to-front radius of curvature (Ra-f) in contact with the crown apex ( 410 ) is at least 25% less than a portion of the apex-to-rear radius of curvature (Ra-r).
8. The aerodynamic golf club head ( 100 ) of claim 7 , wherein the apex-to-front radius of curvature (Ra-f) in contact with the crown apex ( 410 ) is less than 3 inches.
9. The aerodynamic golf club head ( 100 ) of claim 1 , wherein the apex-to-front radius of curvature (Ra-f) in contact with the crown apex ( 410 ) is at least 25% less than a portion of the apex-to-rear radius of curvature (Ra-r) located above the top edge height (TEH).
10. The aerodynamic golf club head ( 100 ) of claim 9 , wherein a portion of the crown section ( 400 ) above the top edge height (TEH) has an apex-to-rear radius of curvature (Ra-r) that is less than 3.75 inches.
11. The aerodynamic golf club head ( 100 ) of claim 10 , wherein the portion of the crown section ( 400 ) above the top edge height (TEH) and having the apex-to-rear radius of curvature (Ra-r) of is less than 3.75 inches is a nonmetallic material.
12. The aerodynamic golf club head ( 100 ) of claim 3 , wherein a portion of the crown section ( 400 ) that is nonmetallic material has an apex-to-rear radius of curvature (Ra-r) that is greater than 5 inches.
13. The aerodynamic golf club head ( 100 ) of claim 3 , wherein a portion of the crown section ( 400 ) that is nonmetallic material has a heel-to-toe radius of curvature (Rh-t) located above the top edge height (TEH) that is less than 4 inches.
14. The aerodynamic golf club head ( 100 ) of claim 1 , wherein less than 10% of the club head volume is above the elevation of the maximum top edge height (TEH).
15. The aerodynamic golf club head ( 100 ) of claim 14 , wherein 5-10% of the club head volume is above the elevation of the maximum top edge height (TEH).
16. An aerodynamic golf club head ( 100 ) comprising:
A) a hollow body ( 110 ) having a club head volume of at least 400 cc, a face ( 200 ), a sole section ( 300 ), a crown section ( 400 ), a front ( 112 ), a back ( 114 ), a heel ( 116 ), and a toe ( 118 ), wherein majority of the crown section ( 400 ) is composed of nonmetallic material having a density less than a portion of the sole section ( 300 );
B) the face ( 200 ) having a top edge ( 210 ) and a lower edge ( 220 ), wherein a top edge height (TEH) is the elevation of the top edge ( 210 ) above the ground plane (GP), and a lower edge height (LEH) is the elevation of the lower edge ( 220 ) above the ground plane (GP), wherein a maximum top edge height (TEH) is at least 2 inches; and
C) the crown section ( 400 ) having a crown apex ( 410 ) located an apex height (AH) above a ground plane (GP), wherein within a front-to-back vertical section through the crown apex ( 410 ) and perpendicular to a vertical plane created by a shaft axis (SA), a portion of the crown section ( 400 ) between the crown apex ( 410 ) and the face ( 200 ) has an apex-to-front radius of curvature (Ra-f) and a portion of the crown section ( 400 ) between the crown apex ( 410 ) and the back ( 114 ) of the hollow body ( 110 ) has an apex-to-rear radius of curvature (Ra-r), and wherein the apex-to-front radius of curvature (Ra-f) in contact with the crown apex ( 410 ) is at least 25% less than a portion of the apex-to-rear radius of curvature (Ra-r).
17. The aerodynamic golf club head ( 100 ) of claim 16 , wherein the apex-to-front radius of curvature (Ra-f) in contact with the crown apex ( 410 ) is at least 25% less than a portion of the apex-to-rear radius of curvature (Ra-r) located above the top edge height (TEH) and on a portion composed of nonmetallic material.
18. The aerodynamic golf club head ( 100 ) of claim 17 , wherein a portion of the crown section ( 400 ) above the top edge height (TEH) and composed of nonmetallic material has an apex-to-rear radius of curvature (Ra-r) that is less than 3.75 inches.
19. The aerodynamic golf club head ( 100 ) of claim 16 , wherein within a heel-to-toe vertical section through the crown apex ( 410 ) and parallel to the vertical plane created by the shaft axis (SA), a portion of the crown section ( 400 ) above the top edge height (TEH) and composed of nonmetallic material has a heel-to-toe radius of curvature (Rh-t) that is less than 4 inches.
20. The aerodynamic golf club head ( 100 ) of claim 16 , wherein the crown section ( 400 ) at the crown apex ( 410 ) has a density less than a portion of the sole section ( 300 ) and is composed of nonmetallic material.
21. The aerodynamic golf club head ( 100 ) of claim 16 , wherein the apex-to-front radius of curvature (Ra-f) in contact with the crown apex ( 410 ) is less than 3 inches.
22. The aerodynamic golf club head ( 100 ) of claim 16 , wherein a portion of the crown section ( 400 ) that is nonmetallic material has an apex-to-rear radius of curvature (Ra-r) that is greater than 5 inches.
23. The aerodynamic golf club head ( 100 ) of claim 16 , wherein a portion of the crown section ( 400 ) in front of the crown apex ( 410 ) is formed of nonmetallic material.
24. The aerodynamic golf club head ( 100 ) of claim 16 , wherein an apex ratio of the apex height (AH) to the maximum top edge height (TEH) is at least 1.13.
25. The aerodynamic golf club head ( 100 ) of claim 24 , wherein the apex ratio is at least 1.20.
26. The aerodynamic golf club head ( 100 ) of claim 16 , wherein the hollow body ( 110 ) has a front-to-back dimension (FB) of at least 4.6 inches, a first moment of inertia (MOIy) about a vertical axis through a center of gravity (CG) of the golf club head ( 100 ) is at least 4000 g*cm 2 , and a second moment of inertia (MOIx) about a horizontal axis through the center of gravity (CG) is at least 2000 g*cm 2 .