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Yak-23
The Yakovlev Yak-23 (; USAF/DoD reporting name Type 28, NATO reporting name Flora) is an early Soviet jet fighter with a straight wing. It was developed from the Yak-17 in the late 1940s and used a reverse-engineered copy of a British engine. It was not built in large numbers as it was inferior in performance to the swept-wing Mikoyan-Gurevich MiG-15. Many Yak-23s were exported to the Warsaw Pact nations and remained in service for most of the 1950s, although some were still in use a decade later. Development and description On 11 March 1947, the Council of People's Commissars ordered several design bureaux (OKB), including that of Alexander Yakovlev, to develop a single-seat, straight-winged jet fighter to be equipped with a single British Rolls-Royce Nene or Rolls-Royce Derwent turbojet engine. The aircraft should have a maximum speed of at sea level and a speed of at an altitude of . It should be able to climb to that altitude in 3.5 minutes or less and should have a maximu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yakovlev Yak-17
The Yakovlev Yak-17 (; USAF/ DOD designation Type 16, NATO reporting name Feather) is an early Soviet jet fighter. It was developed from the Yak-15, the primary difference being tricycle landing gear. The trainer version, known as the Yak-17UTI (NATO reporting name Magnet), was the only Soviet jet trainer of the 1940s. Both aircraft were exported in small numbers and the Yak-17 was soon replaced by the far superior Mikoyan-Gurevich MiG-15 beginning in 1950. Design and development After the state acceptance trials of the Yak-15 in May 1947 recommended that the aircraft be modified with a tricycle landing gear more suitable for jet-powered aircraft, the Yakovlev design bureau began design of the Yak-15U or Yak-15U-RD-10 (''uloochshenny'' - improved). The main gear had to be redesigned to place the wheels behind the aircraft's center of gravity. The main gear was moved behind the front spar, and when retracted filled most of the space between the spars. This caused a major red ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Romanian Air Force
The Romanian Air Force (RoAF) () is the air force branch of the Romanian Armed Forces. It has an air force headquarters, an operational command, five air bases, a logistics base, an air defense brigade, an air defense regiment and an ISR (Intelligence, surveillance and reconnaissance), ISR brigade. Reserve forces include one air base and two airfields. In 2022, the Romanian Air Force employed 11,700 personnel. The current chief of the Romanian Air Force Staff is Lieutenant general Leonard-Gabriel Baraboi, who succeeded Lieutenant general Viorel Pană on 29 November 2023. The Romanian Air Force was first formed as the Military Aeronautics Service on 1 April 1913, transformed into the Romanian Air Corps in 1915. The Romanian Land Forces, Army-subordinated Air Corps was reorganized as the independent Royal Romanian Air Force on 1 January 1924, then converted to the present-day Air Force in 1949. The Air Force went through a modernization plan in the 1990s and early 2000s, dropping ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polish Air Force
The Polish Air Force () is the aerial warfare Military branch, branch of the Polish Armed Forces. Until July 2004 it was officially known as ''Wojska Lotnicze i Obrony Powietrznej'' (). In 2014 it consisted of roughly 26,000 military personnel and about 475 aircraft, distributed among ten bases throughout Poland. The Polish Air Force can trace its origins to the second half of 1917 and was officially established in the months following the end of World War I in 1918. During the invasion of Poland by Nazi Germany in 1939, 70% of its aircraft were destroyed. Most pilots, after the Soviet invasion of Poland on 17 September, escaped via Romania and Hungary to continue fighting throughout World War II in allied air forces, first in France, then in Britain, and later also the Soviet Union. History Polish Air Force backline Origins Military aviation in Poland started even before the officially recognised date of regaining independence (11 November 1918). The first independent units of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lubuskie Muzeum Wojskowe
Lubusz Voivodeship ( ) is a voivodeship (province) in western Poland with a population of 972,140. Its regional capitals are Gorzów Wielkopolski and Zielona Góra. The region is characterized by a landscape of forests, lakes, and rivers, and is bordered by Germany to the west. The functions of regional capital are shared between two citiesGorzów Wielkopolski and Zielona Góra. Gorzów serves as the seat of the centrally-appointed voivode (''wojewoda''), or governor, and Zielona Góra is the seat of the elected regional assembly ( ''sejmik'') and the executive elected by that assembly, headed by a marshal (''marszałek''). In addition, the voivodeship includes a third city (Nowa Sól) and a number of towns. Lubusz Voivodeship borders West Pomeranian Voivodeship to the north, Greater Poland Voivodeship to the east, Lower Silesian Voivodeship to the south, and Germany (Brandenburg and Saxony) to the west. It was created on January 1, 1999, out of the former Gorzów Voivodeship an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Council Of People's Commissars
The Council of People's Commissars (CPC) (), commonly known as the ''Sovnarkom'' (), were the highest executive (government), executive authorities of the Russian Soviet Federative Socialist Republic (RSFSR), the Soviet Union (USSR), and the Soviet republics from 1917 to 1946. The Council of People's Commissars of the Russian Soviet Federative Socialist Republic, Sovnarkom of the RSFSR was founded in the Russian Republic soon after the October Revolution in 1917 and its role was formalized in the Soviet Russia Constitution of 1918, 1918 Constitution of the RSFSR to be responsible to the Congress of Soviets of Russia, Congress of Soviets of the RSFSR for the "general administration of the affairs of the state". Unlike its predecessor the Russian Provisional Government which had representatives of various political parties, and except for the brief two-party cabinet with the Left Socialist-Revolutionaries from December 1917 to March 1918, the Sovnarkom was a government of a single p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexander Sergeyevich Yakovlev
Alexander Sergeyevich Yakovlev (; 22 August 1989) was a Soviet aeronautical engineer. He designed the Yakovlev military aircraft and founded the Yakovlev Design Bureau. Yakovlev joined the Communist Party of the Soviet Union in 1938. Biography Yakovlev was born in Moscow, where his father was an employee of the Nobel Brothers oil company. From 1919 to 1921, he worked as a part-time courier while still in school, and in 1922 he built his first model aeroplane as part of a school project. In 1924, he built a glider, the AVF-10, which made its first flight on 24 September 1924. The design won an award and secured him a position as a worker at the Zhukovsky Air Force Military Engineering Academy. However, his repeated attempts to gain admission to the Academy were denied due to his “lack of proletariat origins”. In 1927, Yakovlev designed the AIR-1 ultralight aircraft. This was the first of ten aircraft he designed between 1927 and 1933. In 1927, Yakovlev finally gained admit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rolls-Royce Nene
The Rolls-Royce RB.41 Nene is a 1940s British centrifugal compressor turbojet engine. The Nene was a complete redesign, rather than a scaled-up Rolls-Royce Derwent,"Rolls-Royce Aero Engines" Bill Gunston, Patrick Stephens Limited 1989, , p.111 with a design target of , making it the most powerful engine of its era. First run in 1944, it was Rolls-Royce Limited, Rolls-Royce's third jet engine to enter production, and first ran less than 6 months from the start of design. It was named after the River Nene in keeping with the company's tradition of naming its jet engines after rivers. The design saw relatively little use in British aircraft designs, being passed over in favour of the Axial flow, axial-flow Rolls-Royce Avon, Avon that followed it. Its only widespread use in the UK was in the Hawker Sea Hawk and the Supermarine Attacker. In the US it was built under licence as the Pratt & Whitney J42, and it powered the Grumman F9F Panther. Its most widespread use was in the form of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rolls-Royce Derwent
The Rolls-Royce RB.37 Derwent is a 1940s British centrifugal compressor turbojet engine, the second Rolls-Royce jet engine to enter production. It was an improved version of the Rolls-Royce Welland, which itself was a renamed version of Frank Whittle's Power Jets W.2B. Rolls-Royce inherited the Derwent design from Rover when they took over their jet engine development in 1943. Design and development Rover When Rover was selected for production of Whittle's designs in 1941 they set up their main jet factory at Barnoldswick, staffed primarily by Power Jets personnel. Rover's Maurice Wilks was also aware of the potential of a more efficient design that removed the Power Jets' "folded" layout with a straight-through airflow. It would also simplify production. This layout had already been used by Whittle in his drawings of the W2Y and W3X and was also being pursued by the de Havilland Company with the Halford H.1. Wilks set up a design office at Waterloo Mill, Clitheroe with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turbojet
The turbojet is an airbreathing jet engine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine has an air inlet which includes inlet guide vanes, a compressor, a combustion chamber, and a turbine (that drives the compressor). The compressed air from the compressor is heated by burning fuel in the combustion chamber and then allowed to expand through the turbine. The turbine exhaust is then expanded in the propelling nozzle where it is accelerated to high speed to provide thrust. Two engineers, Frank Whittle in the United Kingdom and Hans von Ohain in Germany, developed the concept independently into practical engines during the late 1930s. Turbojets have poor efficiency at low vehicle speeds, which limits their usefulness in vehicles other than aircraft. Turbojet engines have been used in isolated cases to power vehicles other than aircraft, typically for attempts on land speed records. Where vehicles are "turbine-powere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yakovlev Yak-25 (1947)
The Yakovlev Yak-25 was a Soviet military aircraft, an early turbojet-powered fighter aircraft designed by the Yakovlev OKB. The designation was later reused for a different interceptor design. Tasked by the Council of Ministers in a directive issued on 11 March 1947, with producing a straight winged fighter similar to the earlier Yak-19, but powered by a Rolls-Royce Derwent V, OKB-115 swiftly produced the Yak-25, which blazed several trails as the first Soviet fighter with a fully pressurised cockpit, air conditioning, jettisonable canopy, and hydraulic airbrakes on the fuselage amongst other innovations.Gunston, 1997 Development The Yak-25 closely followed the Yak-19 in layout if not in detail. The straight wings, though similar in planform, were fractionally larger and much thinner (9% t/c throughout), using laminar flow sections. The CAHI flaps were also hydraulically powered. The vertical tail unit differed from the Yak-19 in being swept back at 40° on the leading edge, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Level
Mean sea level (MSL, often shortened to sea level) is an mean, average surface level of one or more among Earth's coastal Body of water, bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datuma standardised geodetic datumthat is used, for example, as a chart datum in cartography and Navigation, marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to Calibration, calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead a long-term average of tide gauge readings at a particular reference location. The term ''above sea level'' generally refers to the height above mean sea level (AMSL). The term APSL means above present sea level, comparing sea levels in the past with the level today. Earth's radius at sea level is 6,378.137 km (3,963.191 mi) at the equator. It is 6,356.752 km (3,94 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Warsaw Pact
The Warsaw Pact (WP), formally the Treaty of Friendship, Co-operation and Mutual Assistance (TFCMA), was a Collective security#Collective defense, collective defense treaty signed in Warsaw, Polish People's Republic, Poland, between the Soviet Union and seven other Eastern Bloc List of non-communist socialist states, socialist republics in Central and Eastern Europe in May 1955, during the Cold War. The term "Warsaw Pact" commonly refers to both the treaty itself and its resultant military alliance, the Warsaw Pact OrganisationPage 22, �NATO and OSCE, Partners or Rivals?��, Edward Killham (WPO) (also known as ‘Warsaw Treaty Organization’ (‘WTO’)). The Warsaw Pact was the military complement to the Comecon, Council for Mutual Economic Assistance (Comecon), the economic organization for the Eastern Bloc states. Dominated by the Soviet Union, the Warsaw Pact was established as a balance of power or counterweight to the NATO, North Atlantic Treaty Organization (NATO) and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
