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Shimano made their first freehub in 1978 in both the Dura-Ace, and 600 (later known as Ultegra) models. It was a significant improvement. [4] [5] It proved to be the first widely used commercially successful freehub. Freehubs, manufactured by various companies, are now common on mid- to high-end bicycles today. [when?
A fan clutch is a thermostatic engine cooling fan that can freewheel at low temperatures when cooling is not needed, allowing the engine to warm up faster, relieving unnecessary load on the engine. As temperatures increase, the clutch engages so that the fan is driven by engine power and moves air to cool the engine.
An axial fan is a type of fan that causes gas to flow through it in an axial direction, parallel to the shaft about which the blades rotate. The flow is axial at entry and exit. The fan is designed to produce a pressure difference, and hence force, to cause a flow through the fan. Factors which determine the performance of the fan include the ...
A cross-flow fan is a centrifugal fan in which the air flows straight through the fan instead of at a right angle. The rotor of a cross-flow fan is covered to create a pressure differential. A cross-flow fan has two walls outside the impeller and a thick vortex wall inside. The radial gap decreases in the direction of the impeller rotation.
A ducted fan may be powered by any kind of motor capable of turning the fan. Examples include piston, rotary (Wankel), and turboshaft combustion engines, as well as electric motors. The fan may be mounted directly on the powerplant output shaft, or driven remotely via an extended drive shaft and gearing.
A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, or squirrel-cage fan (because it looks like a hamster wheel).
The best energy exchange (lowest fuel consumption) between the two flows, and how the jet velocities compare, depends on how efficiently the transfer takes place which depends on the losses in the fan-turbine and fan. [12] The fan flow has lower exhaust velocity, giving much more thrust per unit energy (lower specific thrust). Both airstreams ...
The rear cog cluster on a derailleur bicycle, which fits on a freehub. It consists only of cogs, with no ratcheting mechanism, as the ratcheting mechanism is in the freehub. [22] Chain gang A group of cyclists cycling in a close knit formation akin to a road race, normally for the purposes of training. [12] Chain slap
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