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Chainstay: a pair of tubes on a bicycle frame that runs from the bottom bracket to the rear fork ends. Chain tensioner: a device to maintain proper chain tension. Chaintug: a device to aid in setting the proper chain tension. Cluster: a bicycle cogset, either a freewheel, or cassette.
Ratcheting freewheel mechanism (van Anden, 1869) In mechanical or automotive engineering, a freewheel or overrunning clutch is a device in a transmission that disengages the driveshaft from the driven shaft when the driven shaft rotates faster than the driveshaft. An overdrive is sometimes mistakenly called a freewheel, but is otherwise unrelated.
For empty freight cars with axle loads of 5.5 tonnes, Crr goes up to 0.00020 at 60 km/h but at a low speed of 20 km/h it increases to 0.00024 and at a high speed (for freight trains) of 120 km/h it is 0.00028. The Crr obtained above is added to the Crr of the other components to obtain the total Crr for the wheels.
Light use of the rear brake causes a light skid as the bicycle approaches the limit where pitchover will occur, a signal to reduce force on the front brake. On a low-traction surface or when turning, the front wheel will skid, the bicycle cannot be balanced and will fall to the side instead.
Pierre-Simon Laplace's five-volume Traité de mécanique céleste (1798–1825) forsook geometry and developed mechanics purely through algebraic expressions, while resolving questions that the Principia had left open, like a full theory of the tides. [130] The concept of energy became a key part of Newtonian mechanics in the post-Newton period.
The adjustable bend [1] is a bend knot that is easy to lengthen or shorten. A rolling hitch is used to tie the end of each rope to the standing part of the other. Clifford Ashley suggested it for tying guy ropes .