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Stealth Aircraft
Stealth aircraft are designed to avoid detection using a variety of technologies that reduce reflection/emission of radar, infrared, visible light, radio frequency (RF) spectrum, and audio, collectively known as stealth technology. The F-117 Nighthawk was the first operational aircraft explicitly designed around stealth technology. Other examples of stealth aircraft include the Northrop Grumman B-2 Spirit, B-2 Spirit, the B-21 Raider, the Lockheed Martin F-22 Raptor, F-22 Raptor, the F-35 Lightning II, the Chengdu J-20, and the Sukhoi Su-57. While no aircraft is completely invisible to radar, stealth aircraft make it more difficult for conventional radar to detect or track the aircraft effectively, increasing the odds of an aircraft avoiding detection by enemy radar and/or avoiding being successfully targeted by Semi-active radar guidance, radar guided weapons. Stealth is a combination of passive low observable (LO) features and active emitters such as low-probability-of-interc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flying Wing
A flying wing is a tailless fixed-wing aircraft that has no definite fuselage, with its crew, payload, fuel, and equipment housed inside the main wing structure. A flying wing may have various small protuberances such as pods, nacelles, blisters, booms, or vertical stabilizers. Similar aircraft designs, that are not technically flying wings, are sometimes casually referred to as such. These types include blended wing body aircraft and lifting body aircraft, which have a fuselage and no definite wings. Whilst a pure flying wing is theoretically the lowest- drag design configuration for a fixed wing aircraft, a lack of conventional stabilizing surfaces and the associated control surfaces make them unstable and difficult to control. The basic flying wing configuration became an object of significant study during the 1920s, often in conjunction with other tailless designs. In the Second World War, both Nazi Germany and the Allies made advances in developing flying wings. Mili ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northrop Grumman B-2 Spirit
The Northrop B-2 Spirit, also known as the Stealth Bomber, is an American Heavy bomber, heavy strategic bomber, featuring low-observable stealth aircraft, stealth technology designed to penetrator (aircraft), penetrate dense anti-aircraft warfare, anti-aircraft defenses. A Subsonic aircraft, subsonic flying wing with a crew of two, the plane was designed by Northrop Corporation, Northrop (later Northrop Grumman) as the prime contractor, with Boeing, Hughes Aircraft Company, Hughes, and Vought as principal subcontractors, and was produced from 1988 to 2000. The bomber can drop conventional weapon, conventional and thermonuclear weapons, such as up to eighty Mark 82 bomb, Mk 82 Joint Direct Attack Munition, JDAM Global Positioning System, GPS-guided bombs, or sixteen B83 nuclear bombs. The B-2 is the only acknowledged in-service aircraft that can carry large air-to-surface missile, air-to-surface Standoff missile, standoff weapons in a stealth configuration. Development began ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
F-117 Nighthawk Front
The Lockheed F-117 Nighthawk is an officially retired American single-seat, subsonic, Twinjet, twin-engined, stealth aircraft, stealth attack aircraft developed by Lockheed Corporation, Lockheed's secretive Skunk Works division and operated by the United States Air Force (USAF). It was the first operational aircraft to be designed with stealth technology. Work on what would become the F-117 commenced in the 1970s as a means of countering increasingly sophisticated Soviet surface-to-air missiles (SAMs). During 1976, the Defense Advanced Research Projects Agency (DARPA) issued Lockheed a contract to produce the ''Lockheed Have Blue, Have Blue'' technology demonstrator, the test data from which validated the concept. On 1 November 1978, Lockheed decided to proceed with the F-117 development program. Five prototypes were produced; the first of which performed its maiden flight in 1981 at Groom Lake, Nevada. The first production F-117 was delivered in 1982, and its initial operat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiation-absorbent Material
In materials science, radiation-absorbent material (RAM) is a material which has been specially designed and shaped to absorb incident RF radiation (also known as non-ionising radiation), as effectively as possible, from as many incident directions as possible. The more effective the RAM, the lower the resulting level of reflected RF radiation. Many measurements in electromagnetic compatibility (EMC) and antenna radiation patterns require that spurious signals arising from the test setup, including reflections, are negligible to avoid the risk of causing measurement errors and ambiguities. Introduction One of the most effective types of RAM comprises arrays of pyramid-shaped pieces, each of which is constructed from a suitably lossy material. To work effectively, all internal surfaces of the anechoic chamber must be entirely covered with RAM. Sections of RAM may be temporarily removed to install equipment but they must be replaced before performing any tests. To be sufficie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fly-by-wire
Fly-by-wire (FBW) is a system that replaces the conventional aircraft flight control system#Hydro-mechanical, manual flight controls of an aircraft with an electronic interface. The movements of flight controls are converted to electronic signals, and flight control computers determine how to move the actuators at each control surface to provide the ordered response. Implementations either use Aircraft flight control system, mechanical flight control backup systems or else are fully electronic.Fly by Wire Flight Control Systems Sutherland Improved fully fly-by-wire systems interpret the pilot's control inputs as a desired outcome and calculate the control surface positions required to achieve that outcome; this results in various combinations of rudder, Elevator (a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radar Cross Section
Radar cross-section (RCS), denoted σ, also called radar signature, is a measure of how detectable an object is by radar. A larger RCS indicates that an object is more easily detected. An object reflects a limited amount of radar energy back to the source. The factors that influence this include: *the material with which the target is made; *the size of the target relative to the wavelength of the illuminating radar signal; *the absolute size of the target; *the incident angle (angle at which the radar beam hits a particular portion of the target, which depends upon the shape of the target and its orientation to the radar source); *the reflected angle (angle at which the reflected beam leaves the part of the target hit; it depends upon incident angle); *the polarization of the radiation transmitted and received with respect to the orientation of the target. While important in detecting targets, strength of emitter and distance are not factors that affect the calculation o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northrop B-2A Spirit (cropped)
Northrop may refer to: Businesses * Northrop Corporation, an American aircraft manufacturer formed in 1939 * Northrop Grumman, an American aircraft manufacturer formed in 1994 as a merger of the above company with Grumman * Northrop Loom, an American designed weaving loom Places United States * Northrop, Minnesota, a town * Northrop, Minneapolis, Minnesota, a neighborhood * Northrop Auditorium, on the Minneapolis campus of the University of Minnesota * Northrop Field, a former stadium for the University of Minnesota * Northrop High School, Fort Wayne, Indiana * Northrop University, a former aviation institute * Mount Northrop, Minnesota People * Northrop (surname), including a list of people with the name * Northrop Frye Herman Northrop Frye (July 14, 1912 – January 23, 1991) was a Canadian literary critic and literary theorist, considered one of the most influential of the 20th century. Frye gained international fame with his first book, ''Fearful Symmetr ... (1912–199 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stealth Helicopter
Stealth helicopters are helicopters that incorporate stealth technology to decrease an enemy's detection ability. There are a diverse range of technologies used to achieve this decreased detectability; these have largely involved the reduction of several different signatures typically generated by a rotorcraft, including those of noise, radar, and infrared. In many ways, helicopters are less suitable for stealth technology than fixed-wing aircraft are; one such area is their rotor blades, which not only generate copious noise levels but can also give off a strong radar signature. However, blade designs have been developed that can significantly Helicopter noise reduction, reduce noise, which has traditionally been a major issue for any operation involving the clandestine use of helicopters.Axe, David"Aviation Geeks Scramble to ID bin Laden Raid’s Mystery Copter."''Wired'', 4 May 2011. Retrieved: 9 May 2011. Note: Axe quotes a military blog by Bill Tuttle, aviation technician and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
