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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 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, produced by South African manufacturer Vektor * Remington R4 carbine, assault rifle used by the Philippine Marine Corps * Bisnovat R-4, 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 "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, Jaguar Racing's car for the 2003 Formula One season * McRae R4, a rally car designed in part by Colin McRae * Renault R4, alternative name for the Renault 4 * 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) * R-4 motorway (Spain) * R4 road (Zimbabwe), a road connecting Harare and Nyamapanda * Radial Road 4 or R-4, an arterial road of Manila, Philippines


Other transportation

* R4 (Canberra), a bus route in Canberra, Australia * R4 (New York City Subway car) * R4 (RER Vaud), an S-Bahn line in the canton of Vaud * R4 (Rodalies de Catalunya), a commuter rail line in Barcelona, Catalonia, Spain * R4 41st Avenue RapidBus, 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, a racing game for Sega Dreamcast, developed by Senile Team * R4 cartridge, 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