H.12
H12 may refer to: Vehicles * Bell H-12, an American utility helicopter * Curtiss H-12, an American flying boat * Hiller H-12, an American helicopter * , a Royal Navy A-class destroyer * , a Royal Navy H-class submarine * LSWR H12 class, a British steam railcar Other uses * H-12, Islamabad, site of a campus of the National University of Sciences & Technology * Highway H12 (Ukraine) * London Buses route H12 This is a list of Transport for London (TfL) contracted bus routes in London, England, as well as commercial services that enter the Greater London area (except coaches). Bus services in London are operated by Abellio London, Arriva London, ...

Bell H-12
The Bell R-12 (later redesignated H-12; company Model 48) was an American 1940s military utility helicopter built by the Bell Helicopter company. Design and development During 1946, Bell Helicopter began development of a new utility helicopter, the Model 42, much larger than the Model 47, which utilized a scaled-up version of the Model 47's rotor system. Three prototypes were built, but serious rotor problems and complexity of mechanical systems precluded production. The initial Model 42 variant was civilian, but the United States Air Force ordered the development of its military variant, the Model 48. Two prototypes were ordered as the XR-12, powered by a single Pratt & Whitney R-1340-AN-1 radial engine and featuring seating for five. Of very similar construction to the Model 42, the Model 48 had a shorter rotor mast. A production batch of 34 helicopters was ordered, under the designation R-12A, but cancelled in 1947. Another enlarged prototype (the XR-12B, Model 48A) with se ...
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Curtiss H-12
The Curtiss Model H was a family of classes of early long-range flying boats, the first two of which were developed directly on commission in the United States in response to the £10,000 prize challenge issued in 1913 by the London newspaper, the ''Daily Mail'', for the first non-stop aerial crossing of the Atlantic. As the first aircraft having transatlantic range and cargo-carrying capacity, it became the grandfather development leading to early international commercial air travel, and by extension, to the modern world of commercial aviation. The last widely produced class, the Model H-12, was retrospectively designated Model 6 by Curtiss' company in the 1930s, and various classes have variants with suffixed letters indicating differences. Design and development Having transatlantic range and cargo carrying capacity by design, the first H-2 class (soon dubbed ''"The Americans"'' by the Royal Navy) was quickly drafted into wartime use as a patrol and rescue aircraft by the RNAS ...
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Hiller H-12
The Hiller OH-23 Raven is a three-place, military light observation helicopter based on the Hiller Model 360. The Model 360 was designated by the company as the UH-12 ("UH" for United Helicopters),Donald, David. ''The Complete Encyclopedia of World Aircraft''. New York: Barnes & Noble Books, 1998. which was first flown in 1948. Development In 1947, United Helicopters (later renamed Hiller Aircraft) developed the prototype Model 360X helicopter. A year later, on 14 October 1948 the Civil Aeronautics Authority (CAA) issued a production certificate for the Model 360. United Helicopters began producing the Model 360 as the UH-12. In 1949, the UH-12 became the first helicopter to make a transcontinental flight from California to New York. When Hiller upgraded the engine and the rotor blades, the company designated the new model as the UH-12A. It was the UH-12A that would be adopted by both the French and United States militaries, as well as being used by civil commercial opera ...
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LSWR H12 Class
A steam railcar is a rail vehicle that does not require a locomotive as it contains its own steam engine. The first steam railcar was an experimental unit designed and built in 1847 by James Samuel and William Bridges Adams. In 1848, they made the Fairfield steam carriage that they sold to the Bristol and Exeter Railway, who used it for two years on a branch line. Railcars were built in the early 20th century for the London and South Western Railway (LSWR) and before entering passenger service one was lent to the Great Western Railway (GWR). Between 1902 and 1911, 197 steam railcars were built, 99 by the GWR. Introduced either due to competition from the new electric tramways or to provide an economic service on lightly used country branch lines, there were two main designs, either a powered bogie enclosed in a rigid body or an articulated engine unit and carriage, pivoting on a pin. However, with little reserve power steam railcars were inflexible and the ride quality was po ...
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H-12, Islamabad
The National University of Sciences & Technology (NUST) ( ur, , Qaumī Jāmi'ā barā'e Sāins va Ṭaiknālōjī) is a multi-campus public university, public research university having its main campus in Islamabad, Pakistan. The university offers undergraduate and graduate degrees, including doctoral and professional degrees. Founded in 1991, it was initially formed for the need of commissioned officers by combining engineering colleges and schools. Later, it was converted into a public research university with the main campus setup in Islamabad to promote Science, Technology, Engineering and Math, science and technology in Pakistan. Founded to provide quality technical education for rapid industrialization in Pakistan, NUST adopted an American university model and stressed laboratory instruction in applied science and engineering. It has since played a key role in the development of standardization in education of fields such as engineering, mathematics, and technology in Pa ...
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Highway H12 (Ukraine)
H12 is an important Ukraine national highway ( H-highway) in Sumy and Poltava Oblasts, Ukraine, running mainly north–south, and connecting Sumy with Poltava in a more or less straight line. It begins in Sumy at Bandera Street ( Highway H07/ Highway P61) and Illinska Street, and travels straight through central Sumy. It passes through Syrovatka, Boromlya, Trostianets, Klymentove, Okhtyrka, Khukhra, Kotelva, Velyki Budyshcha, and Dykanka, and then loops around Poltava and terminates at the intersection of Highway M03 and Polovky Street. Main route See also * Roads in Ukraine A road is a linear way for the conveyance of traffic that mostly has an improved surface for use by vehicles (motorized and non-motorized) and pedestrians. Unlike streets, the main function of roads is transportation. There are many types of ... * Ukraine State Highways References {{DEFAULTSORT:H12 Roads in Sumy Oblast Roads in Poltava Oblast ...
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