* 1990: ARCH replaced the Bell JetRanger with the MBB / Kawasaki BK 117 aircraft, offering cabin class, twin-engine, space, speed and safety. 1990 also saw the addition of ' fixed-wing ' services when it added a Beechcraft King Air for longer distance transports ( 100 – 500 miles from base ), flights in inclement weather which prohibit rotor wing flights and specialty teams.

The field cuts across the conductors, generating an induced EMF ( electromotive force ), as the mechanical input causes the rotor to turn.

This was necessary because a continuously moving power switch known as the commutator is needed to keep the field correctly aligned across the spinning rotor.

The rate of oxygen transfer at 1.0-mg. / l. dissolved oxygen concentration and 10-degrees-C for various rotor speeds is given in Table 3.

The polyethylene cover reduced the oxygen transfer rate by 10 per cent, indicating that the maximum oxygen transfer is at the rotor rather than through the surface.

The alternative terminology rotor or rotational and alternative notations rot F and ∇ × F are often used ( the former especially in many European countries, the latter, using the del operator and the cross product, is more used in other countries ) for curl and curl F.

Inside the bulb, on a low friction spindle, is a rotor with several ( usually four ) vertical lightweight metal vanes spaced equally around the axis.

An Enigma machine is any of a family of related electro-mechanical rotor cipher machines used for the encryption and decryption of secret messages.

* Urban Aeronautics ' X-Hawk is a VTOL aircraft which operates much like a tandem rotor helicopter, however it doesn't have the exposed rotors which make helicopters dangerous for personal use.

This is accomplished by containing the rotors in large ' ducts ' which make up most of the body of the craft ; the requisite decrease in rotor size also decreases fuel efficiency.

A metal rotor consisting of windows and tabs is mounted to a shaft and arranged so that during shaft rotation, the windows and tabs pass through the air gap between the permanent magnet and semiconductor Hall chip.

While it is true that three power strokes typically occur per rotor revolution due to the 3: 1 revolution ratio of the rotor to the eccentric shaft, only one power stroke per shaft revolution actually occurs ; this engine provides three power ' strokes ' per revolution per rotor giving it a greater power-to-weight ratio than piston engines.

A third type that is more sensitive and expensive known as a spinning rotor gauge exists, but is not discussed here.

Since the driving force behind helicopters is the rotor disk ( which rotates ), gyroscopic precession comes into play.

If the rotor disk is to be tilted forward ( to gain forward velocity ), its rotation requires that the downward net force on the blade be applied roughly 90 degrees ( depending on blade configuration ) before, or when the blade is to one side of the pilot and rotating forward.

This design of rotor is called two-flow or double-exhaust.

These jets contain significant kinetic energy, which is converted into shaft rotation by the bucket-like shaped rotor blades, as the steam jet changes direction.

The ratio of steam velocities relative to the rotor speed at the outlet to the inlet of the blade is defined by the friction coefficient =.

This leads them to the next stage where they again collide with the rotor surface, and this process is continued, finally leading them outwards through the exhaust.

For high compression ratios the throat between adjacent rotor blades ( as shown in the image ) is pointing as much as possible in the forward direction.

The rotor is stabilized in all of its six degrees of freedom.

As the checkerboard pattern of the static spheres is rotated, the rotor rotates.

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.

A turbine is a turbomachine with at least one moving part called a rotor assembly, which is a shaft or drum with blades attached.

The gas is turned by the rotor and exits, relative to the rotor, at velocity V < sub > r2 </ sub >.

Other round shapes for rotors are possible as well in rotor valves, as long as the rotor can be turned inside the valve body.

Animation of a simplified stepper motor ( unipolar ) Frame 1: The top electromagnet ( 1 ) is turned on, attracting the nearest teeth of the gear-shaped iron rotor.

However the rotor in the Hebern machine was geared to the keyboard on the typewriter, so that after every keypress, the rotor turned and the substitution alphabet thus changed slightly.

Operators simply turned the rotor to a pre-chosen starting position and started typing.

To decrypt the message, they turned the rotor around in its socket so it was " backwards ", thus reversing all the substitutions.

It transfers fluid by means of the progress, through the pump, of a sequence of small, fixed shape, discrete cavities, as its rotor is turned.

The rotor ( upper right ) has been removed and turned upside-down.

The four-vane rotor in the hydrogen system produced four electrical impulses per revolution and turned approximately 3, 700 rpm at nominal flow.

The six-vane rotor in the liquid oxygen system produced six electrical impulses per revolution and turned at approximately 2, 600 rpm at nominal flow.

Differential variable capacitors also have two independent stators, but unlike in the butterfly capacitor where capacities on both sides increase equally as the rotor is turned, in a differential variable capacitor one section's capacity will increase while the other section's decreases, keeping the stator-to-stator capacitance constant.

The rotor is turned by an air driven motor and gearing, and is required to be started before starting the boiler and also to be kept in rotation for some time after the boiler is stopped, to avoid uneven expansion and contraction resulting in warping or cracking of the rotor.

In 1972 all rotary engines had their die-cast rotor housing coated with a new process: The new Transplant Coating Process ( TCP ) featured sprayed-on steel which is then coated with chrome, giving greatly increased engine life.

In aeronautics downwash is the air forced down by the aerodynamic action of a wing or helicopter rotor blade in motion, as part of the process of producing lift.

The die-cast rotor housing was now coated with a new process: The new Transplant Coating Process ( TCP ) featured sprayed-on steel which is then coated with chrome.

In 1974, a new process was used to harden the rotor housing.

This process would be repeated eight times until all rotor positions were filled.

This refinement process is essential to meet the performance characteristics of parts like a helicopter rotor shaft, a flap actuator on a military jet or a bearing in a jet engine.

Using the same rotor / chamber configuration, large commercial machines are available to process many liters of cell suspension.