Abstract: A hollow golf club head incorporating a stress reducing feature including a crown located stress reducing feature. The location and size of the crown stress reducing feature, and their relationship to one another and other club head engineering variables, play a significant role in selectively increasing deflection of the face.

Abstract: A high volume aerodynamic golf club head with a club head volume of at least 400 cc producing reduced aerodynamic drag forces. The club head has a crown section imparting beneficial aerodynamic properties due in part to the location of a crown apex and the curvature of the crown section.

Abstract: A high volume aerodynamic golf club head having a post apex attachment promoting region with a club head volume of at least 400 cc producing reduced aerodynamic drag forces. The post apex attachment promoting region is on the surface of the crown section at an elevation above a maximum face height and begins at the crown apex and extends toward the back of the club head. The post apex attachment promoting region is a relatively flat portion of the crown section that is behind the crown apex, yet above the maximum top edge plane, and aides in keeping airflow attached to the club head once it flows past the crown apex.

Abstract: A high volume aerodynamic golf club head with a club head volume of at least 400 cc producing reduced aerodynamic drag forces. The club head has a crown section imparting beneficial aerodynamic and playability properties due in part to the location of a crown apex and the curvature of the crown section.

Abstract: A high volume aerodynamic golf club head with a club head volume of at least 400 cc producing reduced aerodynamic drag forces. The club head has a crown section imparting beneficial aerodynamic and playability properties due in part to the location of a crown apex and the curvature of the crown section.

Abstract: A high volume aerodynamic golf club head having a post apex attachment promoting region with a club head volume of at least 400 cc producing reduced aerodynamic drag forces. The post apex attachment promoting region is on the surface of the crown section at an elevation above a maximum face height and begins at the crown apex and extends toward the back of the club head. The post apex attachment promoting region is a relatively flat portion of the crown section that is behind the crown apex, yet above the maximum top edge plane, and aides in keeping airflow attached to the club head once it flows past the crown apex.

Abstract: A hollow golf club head incorporating a stress reducing feature including a crown located stress reducing feature. The location and size of the crown stress reducing feature, and their relationship to one another and other club head engineering variables, play a significant role in selectively increasing deflection of the face.

Abstract: A hollow golf club head incorporating a stress reducing feature including a sole located stress reducing feature. The location and size of the sole stress reducing feature, and their relationship to one another and other club head engineering variables, play a significant role in selectively influencing deflection of the face.

Abstract: A high volume aerodynamic golf club head with a club head volume of at least 400 cc and a front-to-back dimension of at least 4.4 inches producing reduced aerodynamic drag forces. The club head has a crown section imparting beneficial aerodynamic and playability properties due in part to the location of a crown apex and proximity to a club head center of gravity, a height of the crown apex and a maximum face top edge height, and the curvature of the crown section. These attributes of the crown section contribute to desirable airflow reattachment close to the face and improve airflow attachment to the crown section.

Abstract: A high volume aerodynamic golf club head having a post apex attachment promoting region with a club head volume of at least 400 cc and a front-to-back dimension of at least 4.4 inches producing reduced aerodynamic drag forces. The post apex attachment promoting region is on the surface of the crown section at an elevation above a maximum face height and begins at the crown apex and extends toward the back of the club head. The post apex attachment promoting region is a relatively flat portion of the crown section that is behind the crown apex, yet above the maximum top edge plane, and aides in keeping airflow attached to the club head once it flows past the crown apex.

Abstract: A hollow golf club head incorporating a stress reducing feature including a sole located stress reducing feature. The location and size of the sole stress reducing feature, and their relationship to one another and other club head engineering variables, play a significant role in selectively increasing deflection of the face.

Abstract: A hollow golf club head incorporating a stress reducing feature including a sole located stress reducing feature. The location and size of the sole stress reducing feature, and their relationship to one another and other club head engineering variables, play a significant role in selectively increasing deflection of the face.

Abstract: A hollow golf club head incorporating a stress reducing feature including a crown located stress reducing feature. The location and size of the crown stress reducing feature, and their relationship to one another and other club head engineering variables, play a significant role in selectively increasing deflection of the face.

Abstract: A hollow golf club incorporating a stress reducing feature including a sole located stress reducing feature located on the sole of the club head. The location and size of the sole stress reducing feature, and their relationship to one another and other club head engineering variables, play a significant role in reducing the peak stress seen on the golf club's face during an impact with a golf ball, as well as selectively increasing deflection of the face.

Abstract: A hollow golf club incorporating a stress reducing feature including a crown located stress reducing feature located on the crown of the club head. The location and size of the crown stress reducing feature, and their relationship to one another and other club head engineering variables, play a significant role in reducing the peak stress seen on the golf club's face during an impact with a golf ball, as well as selectively increasing deflection of the face.

Abstract: A hollow golf club incorporating a stress reducing feature including a crown located stress reducing feature, located on the crown of the club head, and a sole located stress reducing feature, located on the sole of the club head. The location and size of the stress reducing features, and their relationship to one another, play a significant role in reducing the peak stress seen on the golf club's face during an impact with a golf ball, as well as selectively increasing deflection of the face.

Abstract: A hollow golf club incorporating a stress reducing feature including a sole located stress reducing feature located on the sole of the club head. The location and size of the sole stress reducing feature, and their relationship to one another and other club head engineering variables, play a significant role in reducing the peak stress seen on the golf club's face during an impact with a golf ball, as well as selectively increasing deflection of the face.

Abstract: A hollow golf club incorporating a stress reducing feature including a crown located stress reducing feature located on the crown of the club head. The location and size of the crown stress reducing feature, and their relationship to one another and other club head engineering variables, play a significant role in reducing the peak stress seen on the golf club's face during an impact with a golf ball, as well as selectively increasing deflection of the face.

Abstract: A high volume aerodynamic golf club head with a club head volume of at least 400 cc and a front-to-back dimension of at least 4.4 inches producing reduced aerodynamic drag forces. The club head has a crown section having a crown apex located an apex height above a ground plane, wherein a portion of the crown section between the crown apex and the face has an apex-to-front radius of curvature that is less than 3 inches. The apex height and location of the crown apex obtain desirable airflow reattachment close to the face and improve airflow attachment to the crown section.

Abstract: A high volume aerodynamic golf club head having a post apex attachment promoting region with a club head volume of at least 400 cc and a front-to-back dimension of at least 4.4 inches producing reduced aerodynamic drag forces. The post apex attachment promoting region is on the surface of the crown section at an elevation above a maximum face height and begins at the crown apex and extends toward the back of the club head. The post apex attachment promoting region is a relatively flat portion of the crown section that is behind the crown apex, yet above the maximum top edge plane, and aides in keeping airflow attached to the club head once it flows past the crown apex.