Clutch

A clutch is a mechanical device that engages and disengages the power transmission, especially from driving shaft to driven shaft.

Clutches are used whenever the transmission of power or motion must be controlled either in amount or over time (e.g., electric screwdrivers limit how much torque is transmitted through use of a clutch; clutches control whether automobiles transmit engine power to the wheels).

In the simplest application, clutches connect and disconnect two rotating shafts (drive shafts or line shafts). In these devices, one shaft is typically attached to an engine or other power unit (the driving member) while the other shaft (the driven member) provides output power for work. While typically the motions involved are rotary, linear clutches are also possible.

In a torque-controlled drill, for instance, one shaft is driven by a motor and the other drives a drill chuck. The clutch connects the two shafts so they may be locked together and spin at the same speed (engaged), locked together but spinning at different speeds (slipping), or unlocked and spinning at different speeds (disengaged).

Super League

Super League, officially the First Utility Super League for sponsorship reasons, is the top-level professional rugby league club competition in Europe. The league has twelve teams: eleven from England and one from France. The current champions are Leeds Rhinos.

Super League began in 1996, replacing the RFL Championship and switching from a winter to a summer season. Each team plays 23 games between February and July: 11 home games, 11 away games and a Magic Weekend game at a neutral venue. At the end of the season, the top eight teams enter a Super 8 stage, playing each other once more. The top four then enter the play-off series leading to the Grand Final (formerly Championship Final) which determines the champions.

The Super League champions play the National Rugby League (NRL) champions from Australasia in the World Club Challenge.

History

1996–2001: Establishment

The competition was first mooted during the Australian Super League war as a way for Rupert Murdoch to gain the upper hand during the battle for broadcasting supremacy with the Australian Rugby League. Murdoch also approached the British clubs to form Super League. A large sum of money aided the decision, and the competition got under way in 1996. Part of the deal saw rugby league switch from a winter to a summer season. The 12 founding teams of Super League were: