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Armed Reconnaissance Helicopter
The Bell ARH-70 Arapaho was an American four-bladed, single-engine, light military helicopter designed for the United States Army's Armed Reconnaissance Helicopter (ARH) program. With a crew of two and optimized for urban combat, the ARH-70 was slated to replace the Army's aging OH-58D Kiowa Warrior. Excessive delays and growth in program costs forced its cancellation on 16 October 2008, when the Department of Defense failed to certify the program to Congress. The ARH-70 was touted as having been built with off-the-shelf technology, the airframe being based on the Bell 407 (and as such was related to the OH-58). Development Background and Armed Reconnaissance Helicopter competition The RAH-66 Comanche helicopter program was canceled by the U.S. Army on 23 February 2004. The cancellation was a result of a six-month study which recommended canceling the program before the Comanche reached production, after 20 years and development costs of over US$6.9 billion. The study estimat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WikiProject Aircraft
A WikiProject, or Wikiproject, is an affinity group for contributors with shared goals within the Wikimedia movement. WikiProjects are prevalent within the largest wiki, Wikipedia, and exist to varying degrees within Wikimedia project, sibling 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 Magazine, 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 outsi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell 430
The Bell 430 is an American/Canadian twin-engine light-medium helicopter built by Bell Helicopter. It is a stretched and more powerful development of the Bell 230, which, in turn, was based on the earlier Bell 222. Development While developing the reengined Model 222 as the 230, Bell began preliminary design work on a stretched derivative with a four-bladed main rotor in 1991. The Bell 430 was formally launched in February 1992, with two prototypes modified from Bell 230s. The first of these flew in its new configuration on October 25, 1994, and the second prototype, featuring the full 430 avionics suite, first flew on December 19, 1994.Frawley, Gerard: ''The International Directory of Civil Aircraft, 2003-2004'', p. 46. Aerospace Publications Pty. Ltd., 2003. . Production of the Bell 230 ended in August 1995, and 430 production began. The first 430 production aircraft was completed later that year. Canadian certification was awarded on February 23, 1996. Deliveries began in mid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gatling Gun
The Gatling gun is a rapid-firing multiple-barrel firearm invented in 1861 by Richard Jordan Gatling of North Carolina. It is an early machine gun and a forerunner of the modern electric motor-driven rotary cannon. The Gatling gun's operation centered on a cyclic multi-barrel design which facilitated cooling and synchronized the firing-reloading sequence. As the handwheel is cranked, the barrels rotate, and each barrel sequentially loads a single cartridge (firearms), cartridge from a top-mounted magazine (firearms), magazine, fires off the shot when it reaches a set position (usually at clock position, 4 o'clock), then ejects the spent casing out of the left side at the bottom, after which the barrel is empty and allowed to cool until rotated back to the top position and gravity-fed another new round. This configuration eliminated the need for a single reciprocating motion, reciprocating bolt (firearms), bolt design and allowed higher rates of fire to be achieved without the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GAU-19
The GAU-19/A (GECAL 50) is an electrically driven, three-barrel rotary heavy machine gun that fires the .50 BMG (12.7×99mm NATO) cartridge. Technical specifications The GAU-19/A is designed to accept standard NATO .50 caliber M9-linked ammunition. The rate of fire is selectable to be either 1,000 or 2,000 rounds per minute. The Humvee armament kit version fires at 1,300 rounds per minute. The average recoil force when firing is 382 lb/ft, 495 lb/ft or 629 lb/ft depending on firing rate. In January 2012, General Dynamics announced they would be delivering a new version designated GAU-19/B. It provides the same firepower in a lighter platform, weighing and optimized for a firing rate of 1,300 rounds per minute and an average recoil force of 562 lb/ft. - General Dynamics Both variants can be configured for an ammunition capacity of 500–1,200 rounds. Both variants are reliable to 40,000 mean rounds between failure. History The ''GECAL 50'' was first manufactured by General E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turboshaft
A turboshaft engine is a form of gas turbine that is optimized to produce shaft horsepower rather than jet thrust. In concept, turboshaft engines are very similar to turbojets, with additional turbine expansion to extract heat energy from the exhaust and convert it into output shaft power. They are even more similar to turboprops, with only minor differences, and a single engine is often sold in both forms. Turboshaft engines are commonly used in applications that require a sustained high power output, high reliability, small size, and light weight. These include helicopters, auxiliary power units, boats and ships, tanks, hovercraft, and stationary equipment. Overview A turboshaft engine may be made up of two major parts assemblies: the 'gas generator' and the 'power section'. The gas generator consists of the Gas compressor, compressor, combustion chambers with ignitors and fuel nozzles, and one or more stages of turbine. The power section consists of additional stages of turbi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air International
''AIR International'' is a British aviation magazine covering current defence aerospace and civil aviation topics. It has been in publication since 1971 and is currently published by Key Publishing Ltd. History and profile The magazine was first published in June 1971 with the name ''Air Enthusiast''. In January 1974 its title was changed to ''Air Enthusiast International'' and finally to ''Air International'' in July 1974. ''Air International'' is published by Key Publishing Limited. The magazine has its headquarters in Stamford, Lincolnshire. Sister publications include ''Air Forces Monthly'', ''Airliner World'', '' Airports International'', ''FlyPast ''FlyPast'' is an aircraft magazine, published monthly, edited by Tom Allett, Steve Beebee and Jamie Ewan. History and profile The magazine started as a bi-monthly edition in May/June 1981 and its first editor was the late Mike Twite. It is ow ...,'' and '' Today's Pilot'' (no longer published by Key Publishing). Refere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iraqi Air Force
The Iraqi Air Force (IQAF; ) is the aerial warfare service branch of the Iraqi Armed Forces. It is responsible for the defense of Iraqi airspace as well as the policing of its international borders. The IQAF also acts as a support force for the Iraqi Navy and the Iraqi Army, which allows Iraq to rapidly deploy its military. It is headquartered in Baghdad; the current commander is Lieutenant Gen. Shihab Jahid Ali. The Iraqi Air Force was founded in 1931, during the period of British control in Iraq after their defeat of the Ottomans in the First World War, with only a few pilots. The Iraqi Air Force operated mostly British aircraft until the 14 July Revolution in 1958, when the new Iraqi government began increased diplomatic relationships with the Soviet Union. The air force used both Soviet and British aircraft throughout the 1950s and 1960s. When Saddam Hussein came to power in 1979, the air force grew quickly when Iraq ordered more Soviet and French aircraft. The air forc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Department Of Defense
The United States Department of Defense (DoD, USDOD, or DOD) is an United States federal executive departments, executive department of the federal government of the United States, U.S. federal government charged with coordinating and supervising the six U.S. armed services: the United States Army, Army, United States Navy, Navy, United States Marine Corps, Marines, United States Air Force, Air Force, United States Space Force, Space Force, the United States Coast Guard, Coast Guard for some purposes, and related functions and agencies. As of November 2022, the department has over 1.4 million active-duty uniformed personnel in the six armed services. It also supervises over 778,000 National Guard (United States), National Guard and reservist personnel, and over 747,000 civilians, bringing the total to over 2.91 million employees. Headquartered at the Pentagon in Arlington County, Virginia, just outside Washington, D.C., the Department of Defense's stated mission is "to provid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nunn–McCurdy Amendment
The Nunn–McCurdy Amendment or Nunn–McCurdy Provision, introduced by Senator Sam Nunn and Congressman Dave McCurdy in the United States 1982 Defense Authorization Act and made permanent in 1983, is designed to curtail cost growth in American weapons procurement programs. It requires notification to the United States Congress if the cost per unit goes more than 25% beyond what was originally estimated and calls for the termination of programs with total cost growth greater than 50%, unless the Secretary of Defense submits a detailed explanation certifying: # the program is essential to national security, that no suitable alternative of lesser cost is available; # new estimates of total program costs are reasonable; and # management structure is (or has been made) adequate to control costs. Congress normally regards the explanations from the Secretary of Defense as acceptable. It is unusual for a program to be cancelled as a result of notification, but it has led to many chan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Textron
Textron Inc. is an American industrial Conglomerate (company), conglomerate based in Providence, Rhode Island. Textron's subsidiaries include Arctic Cat, Bell Textron, Kautex, Textron Aviation (which itself includes the Beechcraft and Cessna brands), and Lycoming Engines. It was founded by Royal Little in 1923 as the Special Yarns Company. In 2020, Textron employed over 33,000 people in 25 countries. The company ranked 265th on the 2021 Fortune 500, ''Fortune'' 500 of the largest United States corporations by revenue. History Early history Textron started as a textile company in 1923, when 27-year-old Royal Little founded the Special Yarns Corporation in Boston, Massachusetts. The company manufactured synthetic yarns, a niche product at the time. By the start of World War II, the company was known as Atlantic Rayon Corporation and manufactured parachutes. As war production wound down, the company started making civilian products as well and was renamed Textron: "Tex" for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autorotation (helicopter)
Autorotation is a state of flight in which the Helicopter rotor, main rotor system of a helicopter or other rotary-wing aircraft turns by the action of air moving up through the rotor, as with an autogyro, rather than engine power driving the rotor.Igor Bensen, Bensen, Igor.How they fly – Bensen explains all" ''Gyrocopters UK''. Accessed: 10 April 2014. Quote: "air.. (is) deflected downward"Charnov, Bruce HCierva, Pitcairn and the Legacy of Rotary-Wing Flight ''Hofstra University''. Accessed: 22 November 2011. The term ''autorotation'' dates to a period of early helicopter development between 1915 and 1920, and refers to the rotors turning without the engine."Autorotation", ''Dictionary.com Unabridged (v 1.1)''. Random House, Inc. 17 April 2007 It is analo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fuel Starvation
In an internal combustion engine, fuel starvation is the failure of the fuel system to supply sufficient fuel to allow the engine to run properly, for example due to blockage, vapor lock, contamination by water, malfunction of the fuel pump or incorrect operation, leading to loss of power or engine stoppage. There is still fuel in the tank(s), but it is unable to get to the engine(s) in sufficient quantity. By contrast, fuel exhaustion (also called ''fuel depletion'') is an occurrence in which the vehicle in question becomes completely devoid of usable fuel, with results similar to those of fuel starvation. All engine-powered modes of transport can be affected by fuel starvation, although the problem is most serious for aircraft in flight. Ships are affected to the extent that without propulsion they cannot maneuver to avoid collisions or beaching. On aircraft, fuel starvation is often the result of incorrect fuel management, for example by selecting to feed the engine from an em ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
