|
Townend Ring
A Townend ring is a narrow-chord (aircraft), chord cowling ring fitted around the cylinders of an aircraft radial engine to reduce drag and improve cooling. It was patented in 1929, and found use on various aircraft of the 1930s and into the 1940s. Development The Townend ring was the invention of Dr. Hubert Townend of the United Kingdom, British National Physical Laboratory (United Kingdom), National Physical Laboratory in 1929. Patents were supported by Boulton & Paul Ltd in 1929. In the United States it was often called a "drag ring". It caused a reduction in the drag of radial engines and was widely used in high-speed designs of 1930–1935, before the long-chord NACA cowling came into general use. Despite suggestions of it exploiting the Meredith effect, low airspeeds, low temperature differences and small mass flows make that unlikely, particularly when combined with the lack of flow control as the air exits the cowling.Becker, J.; ''The high-speed frontier: Case h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PZL L2
PZL, may refer to: Places * PZL, an IATA airport code for Phinda Airfield in KwaZulu-Natal, South Africa * PZL, a location code for the Złotów County, Greater Poland Voivodeship, Poland, in the system of the vehicle registration plates of Poland Technology * Państwowe Zakłady Lotnicze (PZL), a defunct Poland-based aerospace manufacturer operating from 1928 to 1989 * PZL-Kalisz, a machinery and electronics manufacturer based in Poland * PZL Mielec (Polskie Zakłady Lotnicze), an aerospace manufacturer based in Poland * PZL-Świdnik, a helicopter manufacturer based in Poland Others * Polish Hunting Union (Polish: ''Polski Związek Łowiecki'', PZŁ), an organization of hunters in Poland * Polish Union of Peasant Activists (Polish: ''Polski Związek Ludowców'', PZL), a political party in Second Polish Republic, Poland, operating from 1923 to 1924 {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chord (aircraft)
In aeronautics, the chord is an imaginary straight line segment joining the leading edge and trailing edge of an aerofoil cross section parallel to the direction of the airflow. The chord length is the distance between the trailing edge and the leading edge. L. J. Clancy (1975), ''Aerodynamics'', Section 5.2, Pitman Publishing Limited, London. The point on the leading edge used to define the main chord may be the surface point of minimum radius. p.18 For a turbine aerofoil, the chord may be defined by the line between points where the front and rear of a 2-dimensional blade section would touch a flat surface when laid convex-side up. The wing, horizontal stabilizer, vertical stabilizer and propeller/rotor blades of an aircraft are all based on aerofoil sections, and the term ''chord'' or ''chord length'' is also used to describe their width. The chord of a wing, stabilizer and propeller is determined by measuring the distance between leading and trailing edges in the direc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radial Engine
The radial engine is a reciprocating engine, reciprocating type internal combustion engine, internal combustion engine configuration in which the cylinder (engine), cylinders "radiate" outward from a central crankcase like the spokes of a wheel. It resembles a stylized Star polygon, star when viewed from the front, and is called a "star engine" in some other languages. The radial configuration was commonly used for aircraft engines before gas turbine engines became predominant. Engine operation Since the axes of the cylinders are coplanar, the connecting rods cannot all be directly attached to the crankshaft unless mechanically complex forked connecting rods are used, none of which have been successful. Instead, the pistons are connected to the crankshaft with a master-and-articulating-rod assembly. One piston, the uppermost one in the animation, has a master rod with a direct attachment to the crankshaft. The remaining pistons pin their connecting rods' attachments to rings ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Armstrong Whitworth AW
Armstrong may refer to: Places * Armstrong Creek (other), various places * Armstrong River (other), various rivers Antarctica * Armstrong Reef, Biscoe Islands Argentina * Armstrong, Santa Fe Australia * Armstrong, Victoria Canada * Armstrong, British Columbia * Armstrong, Ontario * Armstrong, Thunder Bay District, Ontario * Armstrong, Ontario (Indian settlement) United States * Armstrong, California * Armstrong, Delaware * Armstrong, Florida * Armstrong, Georgia * Armstrong, Illinois * Armstrong, Indiana * Armstrong, Iowa * Armstrong, Minnesota * Armstrong, Missouri * Armstrong, Oklahoma * Armstrong, Texas * Armstrong, Wisconsin * Armstrong County, Pennsylvania * Armstrong County, Texas * Armstrong Lake (Blue Earth County, Minnesota), a lake in Minnesota * Armstrong Township, Vanderburgh County, Indiana * Armstrong Township, Pennsylvania (other), more than one, including ** Armstrong Township, Indiana County, Pennsylvania ** Armst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hubert Townend
Hubert is a Germanic masculine given name, from ''hug'' "mind" and '' beraht'' "bright". It also occurs as a surname. Saint Hubert of Liège (or Hubertus) (c. 656 – 30 May 727) is the patron saint of hunters, mathematicians, opticians, and metalworkers. People with the given name Hubert This is a small selection of articles on people named Hubert; for a comprehensive list see instead . * Hubert Aaronson (1924–2005), F. Mehl University Professor at Carnegie Mellon University * Hubert Adair (1917–1940), World War II Royal Air Force pilot *Hubert Auriol (1952–2021), French professional off-road motorcyclist and auto racer * Hubert Austin (1841–1915), English architect * Hubert Badanai (1895–1986), Canadian automobile dealer and politician * Hubert Bath (1883–1945), English film composer, music director, and conductor * Hubert Beckers (1806–1889), German philosopher * Hubert Boulard, a French comics creator who is unusually credited as "Hubert" * Hubert Brasier ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotland, Wales and Northern Ireland. The UK includes the island of Great Britain, the north-eastern part of the island of Ireland, and most of List of islands of the United Kingdom, the smaller islands within the British Isles, covering . Northern Ireland shares Republic of Ireland–United Kingdom border, a land border with the Republic of Ireland; otherwise, the UK is surrounded by the Atlantic Ocean, the North Sea, the English Channel, the Celtic Sea and the Irish Sea. It maintains sovereignty over the British Overseas Territories, which are located across various oceans and seas globally. The UK had an estimated population of over 68.2 million people in 2023. The capital and largest city of both England and the UK is London. The cities o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Physical Laboratory (United Kingdom)
The National Physical Laboratory (NPL) is the national measurement standards laboratory of the United Kingdom. It sets and maintains physical standards for British industry. Founded in 1900, the NPL is one of the oldest metrology institutes in the world. Research and development work at the laboratory has contributed to the advancement of many disciplines of science, including the development of early computers in the late 1940s and 1950s, construction of the first accurate atomic clock in 1955, and the invention and first implementation of packet switching in the 1960s, which is today one of the fundamental technologies of the Internet. The former heads of NPL include many individuals who were pillars of the British scientific establishment. NPL is based at Bushy Park in Teddington, southwest London. It is operated by NPL Management Ltd, a company owned by the Department for Science, Innovation and Technology, and is one of the most extensive government laboratories in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boulton & Paul Ltd
Boulton & Paul Ltd was a British general manufacturer from Norwich, England that became involved in aircraft manufacture. Jeld Wen Inc. bought Boulton & Paul (along with another joinery company John Carr) from the Rugby Group plc in 1999 to form its British subsidiary. History The company's origins date back to an ironmonger's shop founded in 1797 in Norwich by William Moore. William Staples Boulton joined the ironworks firm of Moore & Barnard in 1844. By 1870 Boulton had been elevated to a partner alongside of John Barnard and the firm was renamed to Barnard & Boulton. A later partner in the firm was Joseph Paul, and the firm was again renamed to Boulton & Paul Ltd, which started its construction engineering division in 1905. By the early 1900s, Boulton & Paul Ltd had become a successful general manufacturing firm. During the Second World War it was a major producer of prefabricated buildings, wire netting and wooden sub-assemblies of aircraft. In 1942 the Midland Woo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NACA Cowling
The NACA cowling is a type of aerodynamic Aircraft fairing, fairing used to streamliner, streamline radial engines installed on airplanes. It was developed by Fred Weick of the National Advisory Committee for Aeronautics (NACA) in 1927. It was a major advancement in aerodynamic drag reduction, and paid for its development and installation costs many times over due to the gains in fuel efficiency that it enabled. NACA won the 1929 Collier Trophy for its development. History and design The NACA cowling enhanced speed through drag reduction while improving engine cooling. The cowling consists of a symmetric, circular airfoil that is wrapped around the engine. In a normal planar airfoil, like a wing, the difference in airspeeds, and their associated changes in pressure, on the top and bottom surfaces, enhances lift. In the case of the NACA cowl, the ring-shaped airfoil is positioned so this lift effect is forward. This thrust does not fully counter the drag of the cowl but greatly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meredith Effect
The Meredith effect is a phenomenon whereby the aerodynamic drag produced by a cooling radiator may be offset by careful design of the cooling duct such that useful thrust is produced by the expansion of the hot air in the duct. The effect was discovered in the 1930s and became more important as the speeds of piston-engined aircraft increased over the next decade. The Meredith effect occurs when air flowing through a duct is heated by a heat-exchanger or radiator containing a hot working fluid. Typically the fluid is a coolant carrying waste heat from an internal combustion engine.Becker, J.; "''The high-speed frontier: Case histories of four NACA programs, 1920-1950''," SP-445, NASA (1980), Chapter 5: High-speed Cowlings, Air Inlets and Outlets, and Internal-Flow Systems: The ramjet investigation/ref> The duct must be travelling at a significant speed with respect to the air for the effect to occur. Air flowing into the duct meets drag resistance from the radiator surface and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bundesarchiv Bild 101I-026-0122-32A, Griechenland, Kreta, Ju 52
The German Federal Archives or Bundesarchiv (BArch) (, lit. "Federal Archive") are the national archives of Germany. They were established at the current location in Koblenz in 1952. They are subordinated to the Federal Commissioner for Culture and the Media ( Claudia Roth since 2021) under the German Chancellery, and before 1998, to the Federal Ministry of the Interior. On 6 December 2008, the Archives donated 100,000 photos to the public, by making them accessible via Wikimedia Commons. History The federal archive for institutions and authorities in Germany, the first precursor to the present-day Federal Archives, was established in Potsdam, Brandenburg in 1919, a later date than in other European countries. This national archive documented German government dating from the founding of the North German Confederation in 1867. It also included material from the older German Confederation and the Imperial Chamber Court. The oldest documents in this collection dated back to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boeing P-26 Peashooter
The Boeing P-26 "Peashooter" is the first American production all-metal fighter aircraft and the first pursuit monoplane to enter squadron service with the United States Army Air Corps. Designed and built by Boeing, the prototype first flew in 1932, and the type was still in use with the U.S. Army Air Corps as late as 1941 in the Philippines. There are two surviving Peashooters and three reproductions on display, with two more under construction. Design and development The project, funded by Boeing, to produce the Boeing Model 248 began in September 1931, with the US Army Air Corps supplying the engines and the instruments. The open cockpit, fixed landing gear, externally braced wing design was the last such design procured by the USAAC as a fighter. The Model 248 had a high landing speed, which caused a number of accidents. To remedy this, Flap (aircraft), flaps were fitted to reduce the landing speed. The Army Air Corps ordered three prototypes, designated ''XP-936'', which fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
