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  2. Shaft (golf) - Wikipedia

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

    The most common are: L (Lady), A (Soft Regular, Intermediate or Senior), R (Regular), S (Stiff), and X (Tour Stiff, Extra Stiff or Strong). A regular flex shaft is generally appropriate for those with an average head speed (80-94 mph), while an A-Flex (or senior shaft) is for players with a slower swing speed (70-79 mph), and the stiffer shafts ...

  3. Golf club - Wikipedia

    en.wikipedia.org/wiki/Golf_club

    A regular flex shaft is generally appropriate for those with an average head speed (80–94 mph (129–151 km/h)), while an A-Flex (or senior shaft) is for players with a slower swing speed (70–79 mph (113–127 km/h)), and the stiffer shafts, such as S-Flex and X-Flex (Stiff and Extra-Stiff shafts) are reserved only for those players with an ...

  4. Dunkerley's method - Wikipedia

    en.wikipedia.org/wiki/Dunkerley's_Method

    When an element of mass is offset from the axis of rotation, centrifugal force will tend to pull the mass outward. The elastic properties of the shaft will act to restore the “straightness”. If the frequency of rotation is equal to one of the resonant frequencies of the shaft, whirling will occur. In order to save the machine from failure ...

  5. 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.

  6. Golf swing - Wikipedia

    en.wikipedia.org/wiki/Golf_swing

    Post swing pose for golfer Henry Cotton in 1931. The golf swing is the action by which players hit the ball in the sport of golf. The golf swing is a complex motion involving the whole body; the technicalities of the swing are known as golf stroke mechanics. There are differing opinions on what constitutes a "good" golf swing. [1]

  7. Rotordynamics - Wikipedia

    en.wikipedia.org/wiki/Rotordynamics

    Rotordynamics (or rotor dynamics) is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures. It is commonly used to analyze the behavior of structures ranging from jet engines and steam turbines to auto engines and computer disk storage.

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