Golf shaft

A golf club shaft (100), comprising:

• a shaft distal end (110), a shaft proximal end (120), a shaft outer diameter, a shaft length (130), and a shaft mass, wherein each point along the shaft length (130) has (i) a shaft flexural rigidity, and (ii) a shaft torsional rigidity;
• the shaft (100) having a butt portion (1000) joined to a tip portion (2000) by a coupler (3000);
• the butt portion (1000) having a butt portion distal end (1010), a butt portion proximal end (1020), a butt portion length (1030), a butt portion sidewall (1040) having a butt portion sidewall thickness (1050), a butt portion inner diameter (1060) that varies, and a butt portion outer diameter (1070) of 0.500″-0.700″;
• the tip portion (2000) having a tip portion distal end (2010), a tip portion proximal end (2020), a tip portion length (2030) that is no more than 65% of the butt portion length (1030), a tip portion sidewall (2040) having a tip portion sidewall thickness (2050), a tip portion inner diameter (2060), and a tip portion outer diameter (2070), wherein the tip portion outer diameter (2070) of a portion of the tip portion (2000) is at least 25% less than the butt portion outer diameter (1070) of a portion of the butt portion (1000), and the butt portion sidewall thickness (1050) of a portion of the butt portion (1000) is greater than the tip portion sidewall thickness (2050) of a portion of the tip portion (2000);
• the coupler (3000) having a coupler distal end (3010), a coupler proximal end (3020), a coupler length (3030), a coupler sidewall (3040) having a coupler sidewall thickness (3050), a coupler inner diameter (3060), and a coupler outer diameter (3070);
• the butt portion (1000) formed of a non-metallic butt portion material having a butt material density, a butt portion mass that is 35-75% of the shaft mass, and each point along the butt portion length (1030) having a butt portion flexural rigidity, and a butt portion torsional rigidity;
• the tip portion (2000) formed of a metallic tip portion material having a tip material density that is at least 15% greater than the butt material density, and each point along the tip portion length (2030) having a tip portion flexural rigidity, and a tip portion torsional rigidity, wherein the tip portion flexural rigidity of a portion of the tip portion (2000) is less than the butt portion flexural rigidity of a portion of the butt portion (1000), and the tip portion torsional rigidity of a portion of the tip portion (2000) is less than the butt portion torsional rigidity of a portion of the butt portion (1000);
• wherein a reinforced region (2500) is located between a first point located 5″ from the shaft proximal end (120) and a second point located 24″ from the shaft proximal end (120), and:
• (a) at a first location in the reinforced region (2500) the shaft flexural rigidity is at least 50% greater than a minimum tip portion flexural rigidity and the shaft torsional rigidity is at least 50% greater than a minimum tip portion torsional rigidity and less than 100 N*m2;
• and
• (b) at a second location in the reinforced region (2500) the shaft flexural rigidity is at least 50% greater than a minimum butt portion flexural rigidity and the shaft torsional rigidity is at least 50% greater than a minimum butt portion torsional rigidity.

A golf club shaft (100), comprising:

• a shaft distal end (110), a shaft proximal end (120), a shaft outer diameter, a shaft length (130), and a shaft mass, wherein each point along the shaft length (130) has (i) a shaft flexural rigidity, and (ii) a shaft torsional rigidity;
• the shaft (100) having a butt portion (1000) joined to a tip portion (2000) by a coupler (3000);
• the butt portion (1000) having a butt portion distal end (1010), a butt portion proximal end (1020), a butt portion length (1030), a butt portion sidewall (1040) having a butt portion sidewall thickness (1050), a butt portion inner diameter (1060) that varies, and a butt portion outer diameter (1070) of 0.500″-0.700″;
• the tip portion (2000) having a tip portion distal end (2010), a tip portion proximal end (2020), a tip portion length (2030) that is no more than 65% of the butt portion length (1030), a tip portion sidewall (2040) having a tip portion sidewall thickness (2050), a tip portion inner diameter (2060), and a tip portion outer diameter (2070), wherein the tip portion outer diameter (2070) of a portion of the tip portion (2000) is at least 25% less than the butt portion outer diameter (1070) of a portion of the butt portion (1000), and the butt portion sidewall thickness (1050) of a portion of the butt portion (1000) is greater than the tip portion sidewall thickness (2050) of a portion of the tip portion (2000);
• the coupler (3000) having a coupler distal end (3010), a coupler proximal end (3020), a coupler length (3030), a coupler sidewall (3040) having a coupler sidewall thickness (3050), a coupler inner diameter (3060), and a coupler outer diameter (3070);
• the butt portion (1000) formed of a non-metallic butt portion material having a butt material density, a butt portion mass that is 35-75% of the shaft mass, and each point along the butt portion length (1030) having a butt portion flexural rigidity, and a butt portion torsional rigidity;
• the tip portion (2000) formed of a metallic tip portion material having a tip material density that is at least 15% greater than the butt material density, and each point along the tip portion length (2030) having a tip portion flexural rigidity and a tip portion torsional rigidity, wherein the tip portion flexural rigidity of a portion of the tip portion (2000) is less than the butt portion flexural rigidity of a portion of the butt portion (1000), and the tip portion torsional rigidity of a portion of the tip portion (2000) is less than the butt portion torsional rigidity of a portion of the butt portion (1000);
• and
• wherein a first portion of the shaft (100) extending ⅓ of the shaft length (130) from the shaft proximal end (120) has a first average flexural rigidity and a first average torsional rigidity, a second portion of the shaft (100) extending ⅔ of the shaft length (130) from the shaft distal end (110) has a second average flexural rigidity and a second average torsional rigidity, and the first average torsional rigidity is at least 50% of the second average torsional rigidity.

A golf club shaft (100), comprising:

• a shaft distal end (110), a shaft proximal end (120), a shaft outer diameter, a shaft length (130), and a shaft mass, wherein each point along the shaft length (130) has (i) a shaft flexural rigidity, and (ii) a shaft torsional rigidity;
• the shaft (100) having a butt portion (1000) joined to a tip portion (2000);
• the butt portion (1000) having a butt portion distal end (1010), a butt portion proximal end (1020), a butt portion length (1030), a butt portion sidewall (1040) having a butt portion sidewall thickness (1050), a butt portion inner diameter (1060) that varies, and a butt portion outer diameter (1070) of 0.500″-0.700″;
• the tip portion (2000) having a tip portion distal end (2010), a tip portion proximal end (2020), a tip portion length (2030) that is no more than 65% of the butt portion length (1030), a tip portion sidewall (2040) having a tip portion sidewall thickness (2050), a tip portion inner diameter (2060), and a tip portion outer diameter (2070), wherein the tip portion outer diameter (2070) of a portion of the tip portion (2000) is at least 25% less than the butt portion outer diameter (1070) of a portion of the butt portion (1000), and the butt portion sidewall thickness (1050) of a portion of the butt portion (1000) is greater than the tip portion sidewall thickness (2050) of a portion of the tip portion (2000);
• the butt portion (1000) formed of a non-metallic butt portion material having a butt material density, a butt portion mass that is 35-75% of the shaft mass, and each point along the butt portion length (1030) having a butt portion flexural rigidity, and a butt portion torsional rigidity;
• the tip portion (2000) formed of a metallic tip portion material having a tip material density that is at least 15% greater than the butt material density, and each point along the tip portion length (2030) having a tip portion flexural rigidity, and a tip portion torsional rigidity, wherein the tip portion flexural rigidity of a portion of the tip portion (2000) is less than the butt portion flexural rigidity of a portion of the butt portion (1000), and the tip portion torsional rigidity of a portion of the tip portion (2000) is less than the butt portion torsional rigidity of a portion of the butt portion (1000);
• wherein a first portion of the shaft (100) extending ⅔ of the shaft length (130) from the shaft proximal end (120) has a first average flexural rigidity and a first average torsional rigidity, a second portion of the shaft (100) extending ⅓ of the shaft length (130) from the shaft distal end (110) has a second average flexural rigidity and a second average torsional rigidity, the first average flexural rigidity is at least 50% of the second average flexural rigidity, and the first average torsional rigidity is at least 50% of the second average torsional rigidity;
• and
• wherein a third portion of the shaft (100) extending ⅓ of the shaft length (130) from the shaft proximal end (120) has a third average flexural rigidity and a third average torsional rigidity, a fourth portion of the shaft (100) extending ⅔ of the shaft length (130) from the shaft distal end (110) has a fourth average flexural rigidity and a fourth average torsional rigidity, and the third average torsional rigidity is at least 50% of the fourth average torsional rigidity.