Engineering
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- R. D. MiddlebrookRobert David Middlebrook (May 16, 1929 – April 16, 2010) was a professor of electrical eng
- Ralph Beebe BlackmanRalph Beebe Blackman (August 29, 1904 – May 24, 1990) was an American mathematician and en
- RambollDanish architecture, engineering and consulting group
- Rapatronic cameraHigh-speed camera with an exposure time as brief as 10 nanoseconds
- Real versus nominal value (metrology)Philosophical distinctions
- Reciprocal frameArrangement of construction beams
- Recovery boilerIndustrial equipment used in pulping
- Reference class forecastingMethod of predicting the future
- Regenerative coolingRegenerative cooling is a method of cooling gases in which compressed gas is cooled by all
- Regulation and licensure in engineeringRegulation and licensure in engineering is established by various jurisdictions of the wor
- Reliability-centered maintenanceConcept of maintenance planning
- Relief valveA relief valve or pressure relief valve (PRV) is a type of safety valve used to control or
- Reluctance motorType of electric motor
- RequirementCondition that must be satisfied for an engineered work to be acceptable
- Resolution (beam engine)Resolution was an early beam engine, installed between 1781 and 1782 at Coalbrookdale as a
- Return connecting rod engineA return connecting rod, return piston rod or (in marine parlance) double piston rod engin
- Return ratioThe return ratio of a dependent source in a linear electrical circuit is the negative of t
- Reuleaux polygonConstant-width curve of equal-radius arcs
- Rheinmetall AutomotiveRheinmetall Automotive (formerly KSPG and Kolbenschmidt Pierburg) is the Automotive sector
- Risk matrixRisk assessment comparing the likelihood of a risk to its severity
- River MimramThe River Mimram is a chalk stream in Hertfordshire, England. It runs from its source near
- RNAD CoulportUK nuclear warhead storage depot in Argyll, Scotland
- Road textureRoad surface term
- Robert Eberan von EberhorstAustrian engineer (1902–1982)
- Robert H. LiebeckAmerican aerospace engineer (1938–2026)
- Robotics engineeringEngineering discipline focused on robots
- Rockwell hardness testHardness scale
- Roller chainType of chain drive
- Rolling-element bearingLoad-carrying bearing using rolling elements and rings
- Rolls-Royce Marine SpeyThe Rolls-Royce Marine Spey is a marine gas turbine based on the Rolls-Royce Spey and TF41
- Rolls-Royce MerlinAircraft engine family
- Root-cause analysisMethod of identifying the fundamental causes of faults or problems
- Royal St. John's RegattaThe Royal St. John's Regatta is North America's oldest annual sporting event with document
- RTX CorporationAmerican multinational aerospace and defense conglomerate
- Russ PrizeU.S. National Academy of Engineering award since 2001
- Ruston & HornsbyBritish industrial equipment manufacturer, 1918–1966