Patent ID: 8777773

Claim:
An aerodynamic golf club head ( 100 ) comprising: a) a hollow body ( 110 ) having a face ( 200 ), a sole section ( 300 ), a crown section ( 400 ), a front ( 112 ), a back ( 114 ), a heel ( 116 ), a toe ( 118 ), a volume of at least 400 cubic centimeters, and a maximum front-to-back dimension (fb) of at least 4.4 inches, wherein 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); 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 a ground plane (gp), and a lower edge height (leh) is the elevation of the lower edge ( 220 ) above the ground plane (gp); c) the crown section ( 400 ) having a crown apex ( 410 ) located an apex height (ah) Above the ground plane (gp), wherein the crown section ( 400 ) has a trip step ( 500 ) having a portion located between the crown apex ( 410 ) and the back ( 114 ), and the trip step ( 500 ) has; i) a trip step heel end ( 550 ), a trip step toe end ( 560 ), and a trip step thickness ( 540 ); ii) a trip step leading edge ( 510 ) having a leading edge profile ( 512 ), and wherein: a) the trip step leading edge ( 510 ) is located a trip step offset ( 514 ) behind the face top edge ( 210 ); b) the trip step leading edge ( 510 ) is located behind the crown apex ( 410 ) an apex-to-leading edge offset ( 516 ); c) the trip step leading edge ( 510 ) at the trip step heel end ( 550 ) is located behind the crown apex ( 410 ) an apex-to-heel le offset ( 517 ); d) the trip step leading edge ( 510 ) at the trip step toe end ( 560 ) is located behind the crown apex ( 410 ) an apex-to-toe le offset ( 518 ); e) a portion of the trip step leading edge ( 510 ) is at an elevation above the ground plane (gp) that is less than a maximum top edge height (teh); and f) the trip step ( 500 ) includes at least one curve that has a trip step radius of curvature (rts), and at least a portion of the trip step radius of curvature (rts) is less than twice the apex-to-front radius of curvature (ra-f).