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R4, R04, R.4, R-4, or R/4 may refer to:


Military


Aircraft

* Caudron R.4, World War I French reconnaissance aircraft, first flown in 1915 * Curtiss R-4, air ambulance version of the American
Curtiss Model R __NOTOC__ The Curtiss Model R was a utility aircraft produced for the United States Army and Navy during World War I. It was a conventional, two-bay biplane with slightly staggered wings of unequal span. The aircraft was provided with two open co ...
utility aircraft, first flown in 1915 *
Sikorsky R-4 The Sikorsky R-4 is a two-seat light helicopter that was designed by Igor Sikorsky with a single, three-bladed main rotor and powered by a radial engine. The R-4 was the world's first large-scale mass production, mass-produced helicopter and the ...
, American helicopter, first flown in 1942


Ships

* , Royal Canadian Navy destroyer * , U.S. Navy submarine


Weapons

*
R4 assault rifle The Vektor R4 is a South African 5.56×45mm assault rifle. History It entered service as the standard service rifle of the South African Defence Force (SADF) in 1980. In South African service, the R4 replaced the R1, a variant of the 7. ...
, produced by South African manufacturer Vektor *
Remington R4 The Remington R4 is a firearms platform based on the AR-15/ M16/ M4/M4A1 series designed and manufactured by Remington Arms. Design In 2012, when the R4 was introduced, the platform was available in four variants: the 7-inch R4-C, 11.5-inch R4 ...
carbine, assault rifle used by the
Philippine Marine Corps The Philippine Marine Corps (PMC) () is a naval infantry force under the command of the Philippine Navy. The PMC conducts amphibious, expeditionary, and special operations missions. The Philippine Marines share the traditions of both the US ...
*
Bisnovat R-4 The Bisnovat (later Molniya) R-4 (NATO reporting name AA-5 'Ash') was an early Soviet long-range air-to-air missile. It was used primarily as the sole weapon of the Tupolev Tu-128 interceptor, matching its RP-S ''Smerch'' ('Tornado') radar. Hi ...
, Soviet missile


Other military

*
Plan R 4 Plan R 4 was an unrealised British plan to invade Norway and Sweden in April 1940, during the Second World War. As a result of competing plans for Norway and Operation Weserübung the German invasion of Norway the same month, it was not carrie ...
, the World War II British plan for an invasion of the neutral state of Norway in April 1940


Science

* R4, designation of
risk phrase In simple terms, risk is the possibility of something bad happening. Risk involves uncertainty about the effects/implications of an activity with respect to something that humans value (such as health, well-being, wealth, property or the environ ...
"Forms very sensitive explosive metallic compounds" * R4 nuclear reactor, the fourth nuclear reactor built in Sweden * Exotic R4, in mathematics, a differentiable manifold


Transportation


Cars

* R4, abbreviation for rear-engine, four-wheel drive layout * R4, a sub-class of Group R rally cars *
Jaguar R4 The Jaguar R4 is a Formula One car with which Jaguar Racing competed in the 2003 Formula One season. It was driven by Mark Webber, Antônio Pizzonia and Justin Wilson. After three years in Formula One, and amid a turbulent atmosphere that had ...
, Jaguar Racing's car for the 2003 Formula One season * McRae R4, a rally car designed in part by
Colin McRae Colin Steele McRae, (5 August 1968 – 15 September 2007), was a British rally driver. He was the 1991 and 1992 British Rally Champion, and in 1995 became the first British driver to win the World Rally Championship Drivers' title. At 27, ...
* Renault R4, alternative name for the
Renault 4 The Renault 4, or R4 in short (and 4L, pronounced "Quatrelle" in French ), is an economy car built by the French company Renault from 1961 to 1994. Although the Renault 4 was first marketed as a short estate or wagon, its minimal rear o ...
* Suzuki GSX-R/4, a concept car made by Suzuki in 2001


Roads

* R4 ring road in
Ghent Ghent ( ; ; historically known as ''Gaunt'' in English) is a City status in Belgium, city and a Municipalities of Belgium, municipality in the Flemish Region of Belgium. It is the capital and largest city of the Provinces of Belgium, province ...
, Belgium * R4 expressway (Czech Republic) *
R4 expressway (Slovakia) R4 expressway () is an expressway in the north–south direction in eastern Slovakia. Initially planned to be completed in 2023, the completed long expressway will connect the state border of Poland to the border with Hungary, passing Svidnà ...
* R-4 motorway (Spain) *
R4 road (Zimbabwe) The A2 Highway (also known as the R4 Highway) is a primary road in Zimbabwe running from Harare to Nyamapanda at the border with Mozambique. The Mozambican side border post is called Cochemane. This is a busy entry point used by people travellin ...
, a road connecting Harare and Nyamapanda *
Radial Road 4 Radial Road 4 (R-4), informally known as the R-4 Road, is a network of roads and bridges which comprise the fourth arterial road of Metro Manila in the Philippines. Spanning some , it connects the cities and municipalities of Makati, Manila, and T ...
or R-4, an arterial road of Manila, Philippines


Other transportation

*
R4 (Canberra) Route R4 is a main cross-city bus route in Canberra, Australia operated by ACTION between Belconnen, City, Woden Town Centre and Tuggeranong.
, a bus route in Canberra, Australia *
R4 (New York City Subway car) The R4 was a New York City Subway car model built from 1932 to 1933 by the American Car and Foundry Company in Berwick, Pennsylvania. These subway cars were purchased for the IND Division. A total of 500 R4s were built, numbered 400–899, and ...
*
R4 (RER Vaud) The R4 is a railway service of RER Vaud that provides hourly service between and in the Swiss canton of Vaud. A limited number of trains continue from Bex to . On weekdays, a section of the train operates from to . Swiss Federal Railways ...
, an S-Bahn line in the canton of Vaud *
R4 (Rodalies de Catalunya) The R4 is a line of Rodalies de Catalunya's Barcelona commuter rail service, operated by Renfe Operadora. It runs northwards from the northern limits of the province of Tarragona to Barcelona, passing through the inland Alt Penedès region. The ...
, a commuter rail line in Barcelona, Catalonia, Spain *
R4 41st Avenue RapidBus The R4 41st Ave (designated the 91 B-Line during planning stages) is an express bus route with bus rapid transit elements in Metro Vancouver, British Columbia, Canada. Part of TransLink's RapidBus network, it replaced the 43 Express that tra ...
, an express bus service in Vancouver, BC, Canada


Video games

* R4: Ridge Racer Type 4, a racing game for Sony PlayStation, developed by Namco *
Rush Rush Rally Racing ''Rush Rush Rally Racing'', also known as ''R4'', is an independently developed, commercially released video game developed by Dutch studio Senile Team and published by RedSpotGames.
, a racing game for Sega Dreamcast, developed by Senile Team *
R4 cartridge R4 (also known as Revolution for DS) is an unlicensed flash cartridge for the Nintendo DS handheld system. It allows ROM image, ROMs and Homebrew (video games), homebrew to be booted on the Nintendo DS handheld system from a SD card, microSD ca ...
, a Nintendo DS flash cartridge


Other uses

*
BBC Radio 4 BBC Radio 4 is a British national radio station owned and operated by the BBC. The station replaced the BBC Home Service on 30 September 1967 and broadcasts a wide variety of spoken-word programmes from the BBC's headquarters at Broadcasti ...
the premier BBC speech radio station * R4, a building in the Norwegian Government quarter (''Norw. Regjeringskvartalet'') * Region 4, the
DVD region code DVD region codes are a digital rights management technique introduced in 1997. It is designed to allow rights holders to control the international distribution of a DVD release, including its content, release date, and price, all according to t ...
for most of Mexico, Central America, South America, Australia, New Zealand, Oceania


See also

* 4R (disambiguation) {{Letter-Number Combination Disambiguation