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Rotating inertia (power systems)
Rotating inertia in a power system is the kinetic energy stored in synchronized rotating machines, chiefly synchronous generators, which resists frequency changes when generation and load fall out of balance.
Rotating stall
Rotating stall is an aerodynamic instability of compressors and axial fans in which stalled flow regions rotate around the annulus, lowering pressure rise and stressing blades.
Rotation averaging
Rotation averaging is the problem of estimating absolute rotations, typically camera orientations, from many noisy pairwise relative rotation measurements, and it is a key subproblem of global Structure from Motion.
Rotational latency
Rotational latency, also called rotational delay, is the wait for the desired data sector to rotate under a hard drive's read/write head, averaging half of one full rotation.
Rotational molding
Rotational molding, or rotomolding, is a low-pressure plastics process that makes hollow parts like tanks and kayaks by rotating a heated mold on two axes.
Rotational vibration
Rotational vibration (RV) is a hard disk drive failure mode where torque from neighboring spinning drives rocks the drive, pushing heads off track and cutting performance.
Rotax
Rotax, formally BRP-Rotax GmbH & Co KG, is an Austrian engine manufacturer in Gunskirchen owned by BRP since 2003, whose 912 four-stroke family dominates light-sport and ultralight aircraft.
Rotax 582
The Rotax 582 is a liquid-cooled, two-cylinder, two-stroke aircraft engine produced by BRP-Rotax in Gunskirchen, Austria, since 1989 as a development of the Rotax 532, and became one of its best-selling models.
Rotax 912
The Rotax 912 is a four-cylinder, four-stroke aircraft engine produced by BRP-Rotax in Gunskirchen, Austria, since 1989, the standard powerplant for light sport and ultralight aircraft.
Rotem Sela (רותם סלע)
Rotem Sela (רותם סלע), also known as Rotem Sela-Rotter, is an Israeli model, presenter, and actress who starred in Beauty and the Baker and won Best Actress at Séries Mania 2023.
Rotenburg/Taaken Gas Field
Rotenburg/Taaken is a natural gas field in Landkreis Rotenburg, Lower Saxony, Germany, discovered in 1982 and Germany's most productive gas field in most recent years.
ROTEX (robot)
ROTEX, short for RObot Technology EXperiment, was a small six-axis robot built by the German Aerospace Center and the first remotely controlled robot in space.
Rotherhithe Tunnel
The Rotherhithe Tunnel is a single-bore road tunnel under the River Thames in east London, connecting Rotherhithe with Shadwell. Built between 1904 and 1908, it remains toll-free today.
Rothesay (insurer)
Rothesay is a British specialist insurance company, founded in 2007, that takes on the pension obligations of UK defined-benefit schemes through bulk annuities, buy-ins, and buy-outs.
Rothko Chapel
The Rothko Chapel is a non-denominational chapel in Houston, Texas, housing fourteen monumental dark paintings commissioned from Mark Rothko, opened to the public in February 1971.
Rothschild family residences
Rothschild family residences: the country houses, chateaux, and villas built by the Rothschild banking dynasty, including Waddesdon Manor, Mentmore, Ferrieres, and the Villa Ephrussi de Rothschild, in the Le Gout Rothschild style.
Rotogravure
Rotogravure, also called gravure printing, is an intaglio process in which ink moves from recessed cells engraved in a rotating cylinder onto a moving web, prized for continuous tone and long runs.
Rotor (electric)
The rotor is the rotating part of an electric machine such as a motor or generator, with types including the squirrel-cage, wound, salient-pole, and permanent-magnet rotor.
Rotor kite
A rotor kite, also called a gyro kite or rotary-wing kite, is an unpowered tethered flying machine whose spinning rotor generates lift through autorotation, best known through the German Fa 330 of World War II.
Rotorcraft
A rotorcraft, also called a rotary-wing or rotorwing aircraft, is an aircraft lifted by spinning rotors instead of fixed wings, spanning helicopters, autogyros, and tiltrotors like the V-22.
Rotorcraft records
Rotorcraft records are FAI-ratified aviation records set by helicopters and autogyros, including the 400.87 km/h absolute speed record set by a Westland Lynx in 1986.
RotorWay
RotorWay, also known as Rotorway International, was an American kit helicopter manufacturer based in Chandler, Arizona, producing two-seat amateur-built helicopters from 1967 until its sale and collapse in the 2020s.
RotorWay Exec
The RotorWay Exec is a family of two-seat, piston-powered kit helicopters built in Chandler, Arizona since 1980, including the Exec 90, Exec 162F, and A600 Talon.
Rotten Tomatoes
Rotten Tomatoes is an American website that aggregates professional film and TV reviews into a Tomatometer percentage score. It was founded in 1998 by Senh Duong.
Rotten.com
Rotten.com, also called Rotten dot com, was an early American shock site (1996-2017) founded by Thomas E. Dell, alias Soylent; it hosted death imagery and disturbing content and inspired later shock sites like Goatse.
Rotterdam coal price
The Rotterdam coal price is the benchmark price of steam coal delivered CIF into the ARA ports of Amsterdam, Rotterdam, and Antwerp, quoted in US dollars per tonne.
Rotterdam Rhine Pipeline
The Rotterdam Rhine Pipeline is a pair of underground oil pipelines from Rotterdam to German refineries, opened in 1960 and operated by RRP, a Shell, Ruhr Oel, and bp venture.
Rotunda
A rotunda is a cylindrical building or round hall, usually domed, that serves as a grand focal point, from the Pantheon in Rome to the U.S. Capitol Rotunda.
Rouen Cathedral
Rouen Cathedral (Cathédrale Notre-Dame de Rouen) is the Gothic mother church of Rouen, Normandy, known for its 151-meter cast-iron spire and Claude Monet's painted series of the 1890s.
ROUGE (metric)
ROUGE (Recall-Oriented Understudy for Gisting Evaluation) is a package of metrics scoring machine summaries by overlap with human-written references, introduced by Chin-Yew Lin in 2004 and widely used in summarization evaluation.