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2. Shaft (golf) - Wikipedia

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

   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, such as S-Flex and X-Flex (Stiff and Extra-Stiff shafts) are reserved only for those players with an above average swinging speed, usually ...

3. 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.

4. Wood (golf) - Wikipedia

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

   The shaft length in woods varies from about 40–48 inches (101.6–121.9 cm), with the current standard length for the driver being 45 in (114.3 cm), formerly 43.5 in (110.5 cm). Graphite shafts are usually preferred for woods due to their light weight, which enables users to generate higher clubhead speeds and thus greater distance.

5. Golf club - Wikipedia

   en.wikipedia.org/wiki/Golf_club

   A golf club is a club used to hit a golf ball in a game of golf.Each club is composed of a shaft with a grip and a club head. Woods are mainly used for long-distance fairway or tee shots; irons, the most versatile class, are used for a variety of shots; hybrids that combine design elements of woods and irons are becoming increasingly popular; putters are used mainly on the green to roll the ...

6. Long drive - Wikipedia

   en.wikipedia.org/wiki/Long_drive

   Long drive clubs, which are always drivers, differ in several ways from consumer clubs. Until the recent club length limitation rules, the shafts were much longer than a normal 45 in (114.3 cm) shaft, sometimes exceeding 55 in (139.7 cm). In 2005, a 50 in (127.0 cm) limitation was introduced (measured vertically).

7. List of gear nomenclature - Wikipedia

   en.wikipedia.org/wiki/List_of_gear_nomenclature

   Lead is the axial advance of a helix gear tooth during one complete turn (360°), that is, the Lead is the axial travel (length along the axle) for one single complete helical revolution about the pitch diameter of the gear. Lead angle is 90° to the helix angle between the helical tooth face and an equivalent spur tooth face.