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Light Helicopter Experimental
The Light Helicopter Experimental (LHX) program was a 1980s United States Army helicopter procurement project to replace the AH-1 Cobra and OH-58 Kiowa helicopters. Background In support of the LHX program, the United States Army started the Advanced Composite Airframe Program (ACAP) to develop an all-composite helicopter fuselage. In April 1991, the Boeing-Sikorsky team was selected as the contest winner and received a contract to build four prototypes. Also that month, the helicopter was designated " RAH-66 Comanche" by the Army.Eden, Paul, ed. "Boeing/Sikorsky RAH-66 Comanche". ''Encyclopedia of Modern Military Aircraft''. Amber Books, 2004. . In March 2004, the Army Chief of Staff terminated the Comanche program. The termination happened for several reasons; among them were unrealistic and unachievable overarching requirements, the rising projected cost of production, changing aviation mission of the Army (refusal to consider the changing threat environment), lack of suffici ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WikiProject Aircraft
A WikiProject, or Wikiproject, is a Wikimedia movement affinity group for contributors with shared goals. WikiProjects are prevalent within the largest wiki, Wikipedia, and exist to varying degrees within sister projects such as Wiktionary, Wikiquote, Wikidata, and Wikisource. They also exist in different languages, and translation of articles is a form of their collaboration. During the COVID-19 pandemic, CBS News noted the role of Wikipedia's WikiProject Medicine in maintaining the accuracy of articles related to the disease. Another WikiProject that has drawn attention is WikiProject Women Scientists, which was profiled by '' Smithsonian'' for its efforts to improve coverage of women scientists which the profile noted had "helped increase the number of female scientists on Wikipedia from around 1,600 to over 5,000". On Wikipedia Some Wikipedia WikiProjects are substantial enough to engage in cooperative activities with outside organizations relevant to the field at issue. For e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stovepipe (organisation)
A stovepipe organization (alt organisations) has a structure which largely or entirely restricts the flow of information within the organization to up-down through lines of control, inhibiting or preventing cross-organisational communication. Many traditional, large (especially governmental or transnational) organizations have (or risk having) a stovepipe pattern. Intelligence organizations may deliberately adopt a stovepipe pattern so that a breach or compromise in one area cannot easily spread to others. A famous example of this is Bletchley Park (an allied forces Second World War codebreaking centre where messages encrypted by the Enigma machine were decrypted) where people working in one hut would not know what the people in any other hut did. A stovepipe pattern is most likely to develop in organisations that have some or all of the following characteristics: * Very hierarchical with sharply defined roles or areas of influence (e.g. regional sales teams) * Long reporting lines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LHX Attack Chopper
''LHX Attack Chopper'' is a combat helicopter vehicle simulation game, simulation game published by Electronic Arts in 1990. Development was led by Brent Iverson who later designed ''Chuck Yeager's Air Combat''. The game was released for MS-DOS and ported to the Sega Genesis, Mega Drive/Genesis. Gameplay In addition to the Light Helicopter Experimental, LHX prototype scout-attack helicopter, the game includes two flyable US Army helicopters, the AH-64, AH-64A Apache and UH-60 Blackhawk, and another prototype (as of 1990), MV-22 Osprey (which can actually switch between helicopter and airplane control modes), any of which may be deployed against Soviet-made ground and air military equipment in the three war theaters of Libya, Vietnam and Germany. Allied units are also available, but they do not actively join the fight, nor do the opposing units usually fire upon allied equipment, apart from specific escort missions where a B-2 bomber or a couple of UH-60 tasked with Combat search ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Groupthink
Groupthink is a psychological phenomenon that occurs within a group of people in which the desire for harmony or conformity in the group results in an irrational or dysfunctional decision-making outcome. Cohesiveness, or the desire for cohesiveness, in a group may produce a tendency among its members to agree at all costs. This causes the group to minimize conflict and reach a consensus decision without critical evaluation. Groupthink is a construct of social psychology, but has an extensive reach and influences literature in the fields of communication studies, political science, management, and organizational theory, as well as important aspects of deviant religious cult behaviour. Overview Groupthink is sometimes stated to occur (more broadly) within natural groups within the community, for example to explain the lifelong different mindsets of those with differing political views (such as "conservatism" and "liberalism" in the U.S. political context or the purported benefits ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fenestron
A Fenestron (sometimes alternatively referred to as a fantail or a "fan-in-fin" arrangementLeishman 2006, p. 321.) is an enclosed helicopter tail rotor that operates like a ducted fan. The term ''Fenestron'' is a trademark of multinational helicopter manufacturing consortium Airbus Helicopters (formerly known as Eurocopter). The word itself comes from the Occitan term for a ''small window'', and is ultimately derived from the Latin word ''fenestra'' for ''window''.Prouty, Ray. ''Helicopter Aerodynamics'', Helobooks, 1985, 2004. p. 266. The Fenestron differs from a conventional open tail rotor by being integrally housed within the tail boom, and like the conventional tail rotor it replaces, functions to counteract the torque generated by the main rotor. While conventional tail rotors typically have two or four blades, Fenestrons have between seven and eighteen blades; these may have variable angular spacing so that the noise is distributed over different frequencies. By placing t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NOTAR
NOTAR ("no tail rotor") is a helicopter system which avoids the use of a tail rotor. It was developed by McDonnell Douglas Helicopter Systems (through their acquisition of Hughes Helicopters). The system uses a fan inside the tail boom to build a high volume of low-pressure air, which exits through two slots and creates a boundary layer flow of air along the tailboom utilizing the Coandă effect. The boundary layer changes the direction of airflow around the tailboom, creating thrust opposite the motion imparted to the fuselage by the torque effect of the main rotor. Directional yaw control is gained through a vented, rotating drum at the end of the tailboom, called the direct jet thruster. Advocates of NOTAR believe the system offers quieter and safer operation over a traditional tail rotor. Development The use of directed air to provide anti-torque control had been tested as early as 1945 in the British Cierva W.9. During 1957, a Spanish prototype designed and built by Aerot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sponson
Sponsons are projections extending from the sides of land vehicles, aircraft or watercraft to provide protection, stability, storage locations, mounting points for weapons or other devices, or equipment housing. Watercraft On watercraft, a sponson is a projection that extends outward (usually from the hull, but sometimes other parts of the vessel) to improve stability while floating, or to act as a securing point for other equipment. Vessels with unstable body shapes or unevenly distributed weight are likely to feature sponsons to help prevent capsizing or other instabilities. On many vessels, these projections from the main body of the vessel can be attached and removed quickly and fairly easily. Canoes and kayaks sometimes feature sponson attachments as well, for stability in rough waters. These differ from outriggers, which extend a significant distance away from the body of the craft, and are employed on craft designed for open waters. A sponson's terminus is close to the cr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Assistant Secretary Of Defense For Research And Engineering
The Under Secretary of Defense for Research and Engineering, abbreviated USD (R&E), is a senior official of the United States Department of Defense. The USD (R&E) is charged with the development and oversight of technology strategy for the DoD. The post (or effectively the same post) has at various times had the titles Assistant Secretary of Defense for Research and Engineering (ASD(R&E)), or Director of Defense Research and Engineering (DDR&E). The latter title has itself historically varied between the rank of under secretary and that of assistant secretary. USD (R&E) is the principal staff advisor for research and engineering matters to the Secretary and Deputy Secretary of Defense. In this capacity, USD (R&E) serves as the Chief Technology Officer (CTO) for the Department of Defense charged with the development and oversight of DoD technology strategy in concert with the department's current and future requirements. The goal of USD (R&E) is to extend the capabilities of curr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thinking Outside The Box
Thinking outside the box (also thinking out of the box or thinking beyond the box and, especially in Australia, thinking outside the square) is a metaphor that means to think differently, unconventionally, or from a new perspective. The phrase also often refers to novel or creative thinking. History The origin of the phrase is unclear. "Think beyond the boundary"-metaphors, that is, metaphors that allude to think differently or with less constraints, seem to have an old history. For example, in 1888, The Annual Register records the phrase ''think outside the lines''. Since at least 1954, the nine dots puzzle has been used as a metaphor of the type "think beyond the boundary". Early phrasings include ''go outside the dots'' (1954), ''breakthrough thinking that gets outside the nine-dot square'' (1959), and ''what are the actual boundaries of the problem?'' (1963). In 1969, Norman Vincent Peale writes this in an article for the Chicago Tribune, quote: In 1970, the phrase ''th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OH-6 Cayuse
The Hughes OH-6 Cayuse is a single-engine light helicopter that was designed and produced by the American aerospace company Hughes Helicopters. Its formal name is derived from the Cayuse people while its "Loach" nickname comes from the acronym for the Light Observation Helicopter (LOH) programme that it was procured under. The OH-6 was developed in response to the United States Army issuing Technical Specification 153 in 1960 to replace its Bell H-13 Sioux fleet. The ''Model 369'' was submitted by Hughes, and competed against the two finalists, Fairchild-Hiller and Bell, for a production contract. On 27 February 1963, the first prototype conducted its maiden flight. The Model 369 had a distinctive teardrop-shaped fuselage that had strong crashworthiness properties and provided excellent external visibility. Its four-bladed full-articulated main rotor made it particularly agile, and it was suitable for personnel transport, escort and attack missions, and observation. During May ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WikiProject Aircraft/page Content
A WikiProject, or Wikiproject, is a Wikimedia movement affinity group for contributors with shared goals. WikiProjects are prevalent within the largest wiki, Wikipedia, and exist to varying degrees within sister projects such as Wiktionary, Wikiquote, Wikidata, and Wikisource. They also exist in different languages, and translation of articles is a form of their collaboration. During the COVID-19 pandemic, CBS News noted the role of Wikipedia's WikiProject Medicine in maintaining the accuracy of articles related to the disease. Another WikiProject that has drawn attention is WikiProject Women Scientists, which was profiled by '' Smithsonian'' for its efforts to improve coverage of women scientists which the profile noted had "helped increase the number of female scientists on Wikipedia from around 1,600 to over 5,000". On Wikipedia Some Wikipedia WikiProjects are substantial enough to engage in cooperative activities with outside organizations relevant to the field at issue. For e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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