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2. Iron (golf) - Wikipedia

   en.wikipedia.org/wiki/Iron_(golf)

   Irons in a golf bag. An iron is a type of club used in the sport of golf to propel the ball towards the hole.Irons typically have shorter shafts and smaller clubheads than woods, the head is made of solid iron or steel, and the head's primary feature is a large, flat, angled face, usually scored with grooves.

3. Shaft (golf) - Wikipedia

   en.wikipedia.org/wiki/Shaft_(golf)

   These shafts were resilient and withstood the forces created by the golf swing, but unlike modern, more stiff shafts, their high flexibility required a skilled swing to produce consistent results. Prior to 1935, hickory was the dominant material for shaft manufacturing, but it proved difficult to master for most golfers, as well as being quite ...

4. Callaway Golf Company - Wikipedia

   en.wikipedia.org/wiki/Callaway_Golf_Company

   Callaway, legally Topgolf Callaway Brands Corp., is an American global sports equipment manufacturing company that designs, manufactures, markets and sells golf equipment, more specifically clubs and balls, also including accessories such as bags, gloves, and caps.

5. Big Bertha (golf club) - Wikipedia

   en.wikipedia.org/wiki/Big_Bertha_(golf_club)

   Big Bertha is the name given by Callaway Golf to a number of its lines of golf clubs.The name was chosen to evoke the famous German Big Bertha howitzer.. The original Big Bertha driver was launched in 1991.

6. Long drive - Wikipedia

   en.wikipedia.org/wiki/Long_drive

   Long drive shafts differ from standard shafts. The main difference is greater stiffness, as a flexible shaft will lag in an inconsistent manner, causing a loss of control. These shafts are almost always made of graphite, which is lighter than steel. In order to be stiff, a shaft is usually heavier and stronger than consumer clubs.

7. Critical speed - Wikipedia

   en.wikipedia.org/wiki/Critical_speed

   Stiffness of the shaft and its support; Total mass of shaft and attached parts; Unbalance of the mass with respect to the axis of rotation; The amount of damping in the system; In general, it is necessary to calculate the critical speed of a rotating shaft, such as a fan shaft, in order to avoid issues with noise and vibration.