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2. Dunkerley's method - Wikipedia

   en.wikipedia.org/wiki/Dunkerley's_Method

   The whirling frequency of a symmetric cross section of a given length between two points is given by: N = 94.251 E I m L 3 RPM {\displaystyle N=94.251{\sqrt {EI \over mL^{3}}}\ {\text{RPM}}} where: E = Young's modulus, I = second moment of area , m = mass of the shaft, L = length of the shaft between points.

3. Shaft (golf) - Wikipedia

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

   The shaft is roughly .58 inch/14.7 millimeters in diameter near the grip and between 35 and 48 inches/89–115 cm in length. Shafts weigh between 45 and 150 grams depending on the material and length. Graphite shafts are woven from carbon fiber and are generally lighter in weight than steel shafts. Graphite shafts became popular among amateurs ...

4. Torsion (mechanics) - Wikipedia

   en.wikipedia.org/wiki/Torsion_(mechanics)

   Torsion of a square section bar Example of torsion mechanics. In the field of solid mechanics, torsion is the twisting of an object due to an applied torque [1] [2].Torsion could be defined as strain [3] [4] or angular deformation [5], and is measured by the angle a chosen section is rotated from its equilibrium position [6].

5. Golf club - Wikipedia

   en.wikipedia.org/wiki/Golf_club

   The shaft is roughly 0.5 inches (13 mm) in diameter near the grip and from 34 to 48 inches (86 to 122 cm) in length. Shafts weigh from 45 to 150 grams (1.6 to 5.3 oz), depending on the material and length. [2] Shafts are quantified in a number of different ways. The most common is the shaft flex.

6. 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.

7. Torsion constant - Wikipedia

   en.wikipedia.org/wiki/Torsion_constant

   Non-circular cross-sections always have warping deformations that require numerical methods to allow for the exact calculation of the torsion constant. [ 2 ] The torsional stiffness of beams with non-circular cross sections is significantly increased if the warping of the end sections is restrained by, for example, stiff end blocks.