This clutch system employs centrifugal force to automatically engage the clutch when the engine rpm rises above a threshold and to automatically disengage the clutch when the engine rpm falls low enough.

In the case of a chainsaw this allows the chain to remain stationary whilst the engine is idling ; once the throttle is pressed and the engine speed rises, the centrifugal clutch engages and the cutting chain moves.

* A centrifugal clutch is used in small engine-powered devices such as chain saws, go-karts and model helicopters.

A webbing-sensitive lock is based on a centrifugal clutch activated by rapid acceleration of the strap ( webbing ) from the reel.

In the early days, karts were direct drive only, but the inconvenience of that setup soon led to the centrifugal clutch for the club level classes.

From 1961 ( and almost exclusively in Europe ), VW offered an optional version of the Saxomat semi-automatic transmission — a regular 4-speed manual transaxle coupled to a electromagnetic clutch with a centrifugal clutch used for idle.

The car featured a unitary steel construction, with a front mounted, aircooled two cylinder boxer engine driving the rear wheels through a centrifugal clutch and the Variomatic CVT transmission.

In 1980, Michael Caffrey patented what would later become the Yomega Brain, a yo-yo with a centrifugal clutch transaxle.

** the Yomega Brain is a centrifugal clutch transaxle -- when spinning at a sufficiently high speed, counterweights inside the yo-yo body disengage the axle, automatically allowing the yo-yo to " sleep.

* Drive mechanism — typically a centrifugal clutch and sprocket.

The engine drives the chain around the track by a centrifugal clutch, engaging the chain under power, but allowing it to stop as the engine idles.

* A declutching servo which enabled the driver to change gear with the choke engaged ( In the older DAF models this wasn't possible, because the increased idle caused the centrifugal clutch to engage ).

These can be designed with a manual or automatic clutch system, and may be found both in automobiles ( particularly track and rally racing cars ), motorcycles ( typically light " step-thru " type city utility bikes, e. g. the Honda Cub ) and quadbikes ( often with a separately engaged reversing gear ), the latter two normally using a scooter-style centrifugal clutch.

In some vehicles though ( e. g. motorcycles ), a centrifugal clutch is nevertheless added, however this is only to provide a " neutral " stance on a motorcycle ( useful when idling, or manually reversing into a parking space ).

The shift pattern for most underbone motorcycles with an automatic centrifugal clutch is also modified for two key reasons-to enable the less-experienced riders to shift the gears without problems of " finding " neutral, and also due to the greater force needed to " lift " the gearshift lever ( because the gearshift pedal of an underbone motorcycle also operates the clutch ).

Citroën combined a freewheel and a centrifugal clutch to make the so-called ' TraffiClutch ' where the car could be started, stopped and the lower gears be changed without using the clutch pedal.

The Dyane was also available with the " trafficlutch "-a centrifugal clutch which helped avoid stalling whilst in slow moving urban traffic.

However, the explanation of this curvature involves centrifugal force for all observers with the exception of a truly stationary observer, who finds the curvature is consistent with the rate of rotation of the water as they observe it, with no need for an additional centrifugal force.

An element of water volume on the surface is shown to be subject to three forces: the vertical force due to gravity F < sub > g </ sub >, the horizontal, radially outward centrifugal force F < sub > Cfgl </ sub >, and the force normal to the surface of the water F < sub > n </ sub > due to the rest of the water surrounding the selected element of surface.

In a reference frame uniformly rotating at angular rate Ω, the fictitious centrifugal force is conservative and has a potential energy of the form:

The meaning of the potential energy is that movement of a test body from a larger radius to a smaller radius involves doing work against the centrifugal force.

As the height of water increases, movement toward the periphery becomes no longer advantageous, because the reduction in potential energy from working with the centrifugal force is balanced against the increase in energy working against gravity.

More particularly, in classical mechanics, the centrifugal force is an outward force which arises when describing the motion of objects in a rotating reference frame.

The centrifugal force is what is usually thought of as the cause for apparent outward movement like that of passengers in a vehicle turning a corner, of the weights in a centrifugal governor, and of particles in a centrifuge.

If a rotating frame is chosen so that just the angular position of an object is held fixed, more complicated motion, such as elliptical and open orbits, appears because the centripetal and centrifugal forces will not balance.

For example, centrifugal force is used in the FAA pilot's manual in describing turns.

Unlike the other two fictitious forces, the centrifugal force always points radially outward from the axis of rotation of the rotating frame, with magnitude, and unlike the Coriolis force in particular, it is independent of the motion of the particle in the rotating frame.

In these scenarios, the effects attributed to centrifugal force are only observed in the local frame ( the frame in which the object is stationary ) if the object is undergoing absolute rotation relative to an inertial frame.

Within this view of physics, any other phenomenon that is usually attributed to centrifugal force can be used to identify absolute rotation.

For example, the oblateness of a sphere of freely flowing material is often explained in terms of centrifugal force.

That the Earth is itself an oblate spheroid, bulging at the equator where the radial distance and hence the centrifugal force is larger, is taken as one of the evidences for its absolute rotation.

Milestones among feedback, or " closed-loop " automatic control devices, include the temperature regulator of a furnace attributed to Drebbel, circa 1620, and the centrifugal flyball governor used for regulating the speed of steam engines by James Watt in 1788.

Space stations in the past ( up to 200 years before the action of Shards of Honor ) were null-g or used centrifugal force to generate partial gravity, but now they use artificial gravity.

However, the term " centrifugal pump " can be used to describe all impeller type rotodynamic pumps including the radial, axial and mixed-flow variations.

These pumps are basically multistage centrifugal pumps and are widely used in oil well applications as a method for artificial lift.

Theoretically centrifugal pumps could be used, but it is more compact to use a circulating flow between hollow threads in the rotor and the stator.

Turbochargers were first used in production aircraft engines such as the Napier Lioness in the 1920s, although they were less common than engine-driven centrifugal superchargers.

Dry centrifugal clutches are now used in many categories ( Rotax Max is one example ) and have become the norm as the top international classes have switched to 125 cc clutched engines as of January 2007.

Rotating molds are used and the molten material is added and shaped by centrifugal forces.

The centrifugal governor is often used in the cognitive sciences as an example of a dynamic system, in which the representation of information cannot be clearly separated from the operations being applied to the representation.

In calculations, when a coordinate system is used that is co-rotating with the Earth, the vector of the fictitious centrifugal force ( rotating reference frame ) | centrifugal force points outward, and is just as large as the vector representing the centripetal force.

Low solidity rotors, on the other hand, are best used with centrifugal pumps, waterladder pumps and chain and washer pumps, where the torque needed by the pump for starting is less than that needed for running at design speed.

Because factory machinery needed to operate at a constant speed, Watt linked a steam regulator valve to a centrifugal governor which he adapted from those used to automatically control the speed of windmills.

The submersible pumps used in ESP installations are multistage centrifugal pumps operating in a vertical position.

Unlike Frank Whittle's design, von Ohain's design used a centrifugal compressor and turbine placed very close together, back to back, with the flame cans wrapped around the outside of the assembly.

Speed control with a centrifugal governor was used in automobiles as early as the 1910s, notably by Peerless.

In non-military use, RATs have been used to power centrifugal pumps to pressurize the spray systems on aircraft that are used as crop dusters to deliver liquid agents to cropland.

Centrifugation is a process that involves the use of the centrifugal force for the sedimentation of mixtures with a centrifuge, used in industry and in laboratory settings.

A variation of the centrifugal switch used a changeover contact to ensure that the auxiliary windings remain in the circuit through a running capacitor.