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Accidents And Incidents Involving The V-22 Osprey
The Bell Boeing V-22 Osprey is an American military tiltrotor aircraft with an accident history that has generated controversy over its perceived safety. The aircraft was developed by Bell Helicopter and Boeing Helicopters; the companies partner in its manufacture and support. The V-22 Osprey has had 13 hull loss accidents that have resulted in a total of 51 fatalities. During testing from 1991 to 2006, there were four crashes resulting in 30 fatalities. Since becoming operational in 2007, the V-22 has had eight crashes, including two combat-zone crashes, and several other accidents and incidents that resulted in a total of 16 fatalities. Crashes and hull–loss accidents June 1991 On 11 June 1991, a miswired flight control system led to two minor injuries when the left nacelle struck the ground while the aircraft was hovering in the air, causing it to bounce and catch fire at the New Castle County Airport in Delaware. The pilot, Grady Wilson, suspected that he may have accid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
V-22 Osprey Tiltrotor Aircraft
IC power-supply pins denote a voltage and current supply terminals in Electrical engineering, electric, Electronic engineering, electronics engineering, and in Integrated circuit design. Integrated circuits (ICs) have at least two pins that connect to the power supply rail, power rails of the circuit in which they are installed. These are known as the power-supply pins. However, the labeling of the pins varies by IC family and manufacturer. The double subscript notation usually corresponds to a first letter in a given IC family (transistors) notation of the terminals (e.g. VDD supply for a drain terminal in FETs etc.). The simplest labels are V+ and V−, but internal design and historical traditions have led to a variety of other labels being used. V+ and V− may also refer to the non-inverting (+) and inverting (−) voltage inputs of ICs like op amps. For power supplies, sometimes one of the supply rails is referred to as Ground (electricity), ground (abbreviated "GND") pos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marana Regional Airport
Marana Regional Airport , also known as Marana Northwest Regional Airport or Avra Valley Airport, is a non-towered, general aviation airport about 15 miles (13 nmi; 24 km) northwest of Tucson, Arizona in Marana a town in Pima County, Arizona, United States. In 1999, the airport was purchased from Pima County by the town of Marana. According to the FAA's National Plan of Integrated Airport Systems for 2007–2011, it is categorized as a '' relief airport''. It is not served by any commercial airlines at this time. Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, Marana Regional Airport is assigned AVQ by the FAA and AVW by the IATA. Facilities Marana Regional Airport covers at an elevation of above mean sea level. AVQ has two asphalt paved runways: * 12/30 measuring * 3/21 measuring For the 12-month period ending April 19, 2017, the airport had 90,252 aircraft operations, an average of 248 per day: 67% general ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turbine
A turbine ( or ) (from the Greek , ''tyrbē'', or Latin ''turbo'', meaning vortex) is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. The work produced by a turbine can be used for generating electrical power when combined with a generator.Munson, Bruce Roy, T. H. Okiishi, and Wade W. Huebsch. "Turbomachines." Fundamentals of Fluid Mechanics. 6th ed. Hoboken, NJ: J. Wiley & Sons, 2009. Print. A turbine is a turbomachine with at least one moving part called a rotor assembly, which is a shaft or drum with blades attached. Moving fluid acts on the blades so that they move and impart rotational energy to the rotor. Early turbine examples are windmills and waterwheels. Gas, steam, and water turbines have a casing around the blades that contains and controls the working fluid. Credit for invention of the steam turbine is given both to Anglo-Irish engineer Sir Charles Parsons (1854–1931) for invention of the reaction turbine, and to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine Corps Air Station New River
Marine Corps Air Station New River is a United States Marine Corps helicopter and tilt-rotor base in Jacksonville, North Carolina, in the eastern part of the state. In 1972, the airfield was named McCutcheon Field for General Keith B. McCutcheon, one of the fathers of Marine Corps helicopter aviation. Near Marine Corps Base Camp Lejeune, it shares some facilities with Camp Geiger. History The base was originally 29 parcels of land, a simple stretch of tobacco farm that was purchased for $64,502 in 1941. Officials at Camp Lejeune investigated the area in search of an existing airfield for hosting aircraft in support of amphibious operations. Capt. Barnett Robinson, a member of Marine Glider Group 71, concluded in his search that the farmland would suit the Marine Corps’ needs. The location was placed under the command of Marine Corps Base Camp Lejeune and received its first squadron, VMSB-331 from Marine Corps Air Station Cherry Point on March 9, 1943. On June 1, VMSB-331 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Actuator
An actuator is a component of a machine that is responsible for moving and controlling a mechanism or system, for example by opening a valve. In simple terms, it is a "mover". An actuator requires a control device (controlled by control signal) and a source of energy. The control signal is relatively low energy and may be electric voltage or current, pneumatic, or hydraulic fluid pressure, or even human power. Its main energy source may be an electric current, hydraulic pressure, or pneumatic pressure. The Control device is usually a valve. When it receives a control signal, an actuator responds by converting the source's energy into mechanical motion. In the ''electric'', ''hydraulic'', and ''pneumatic'' sense, it is a form of automation or automatic control. History The history of the pneumatic actuation system and the hydraulic actuation system dates to around the time of World War II (1938). It was first created by Xhiter Anckeleman who used his knowledge of engines and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swashplate
A swashplate, also known as slant disk, was invented by Anthony Michell in 1917. It is a mechanical engineering device used to translate the motion of a rotating shaft into reciprocating motion, or vice versa. The working principle is similar to crankshaft, Scotch yoke, or wobble/nutator/Z-crank drives, in engine designs. It was originally invented to replace a crankshaft, and is one of the most popular concepts used in crankless engines. Construction A swashplate consists of a disk attached to a shaft. If the disk were aligned perpendicular to the shaft, then rotating the shaft would merely turn the disk with no reciprocating (or ''swashplate'') effect. But instead the disk is mounted at an oblique angle, which causes its edge to appear to describe a path that oscillates along the shaft's length as observed from a non-rotating point of view away from the shaft. The greater the disk's angle to the shaft, the more pronounced is this apparent linear motion. The apparent linear mot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulics
Hydraulics (from Greek: Υδραυλική) is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids. At a very basic level, hydraulics is the liquid counterpart of pneumatics, which concerns gases. Fluid mechanics provides the theoretical foundation for hydraulics, which focuses on the applied engineering using the properties of fluids. In its fluid power applications, hydraulics is used for the generation, control, and transmission of power by the use of pressurized liquids. Hydraulic topics range through some parts of science and most of engineering modules, and cover concepts such as pipe flow, dam design, fluidics and fluid control circuitry. The principles of hydraulics are in use naturally in the human body within the vascular system and erectile tissue. Free surface hydraulics is the branch of hydraulics dealing with free surface flow, such as occurring in rivers, canals, lakes, estuar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrical Wiring
Electrical wiring is an electrical installation of cabling and associated devices such as switches, distribution boards, sockets, and light fittings in a structure. Wiring is subject to safety standards for design and installation. Allowable wire and electrical cable, cable types and sizes are specified according to the circuit operating voltage and electric current capability, with further restrictions on the environmental conditions, such as ambient temperature range, moisture levels, and exposure to sunlight and chemicals. Associated circuit protection, control, and distribution devices within a building's wiring system are subject to voltage, current, and functional specifications. Wiring safety codes vary by locality, country, or region. The International Electrotechnical Commission (IEC) is attempting to harmonise wiring standards among member countries, but significant variations in design and installation requirements still exist. Wiring codes of practice and regulat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chafing
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Chafing can refer to: * Chafing (nautical), damage to sails or other parts of a boat from rubbing * Chafing (skin), skin irritation from rubbing or sweat See also * Chafing dish * Chafing fuel Chafing fuel is a fuel used for heating food, typically placed under a chafing dish. It is usually sold in a small canister and burned directly within that canister, with or without a wick. The fuel often contains methanol, ethanol, or diethyl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jacksonville, North Carolina
Jacksonville is a city in Onslow County, North Carolina, United States. As of the 2020 census, the population was 72,723, which makes Jacksonville the 14th-largest city in North Carolina. Jacksonville is the county seat and most populous community of Onslow County, which is coterminous with the Jacksonville, North Carolina metropolitan area. Demographically, Jacksonville is the youngest city in the United States, with an average age of 22.8 years old, which can be attributed to the large military presence. The low age may also be in part due to the population drastically going up over the past 80 years, from 783 in the 1930 census to 72,876 in the 2021 Census estimate. It is the home of the United States Marine Corps' Camp Lejeune and New River Air Station. Jacksonville is located adjacent to North Carolina's Crystal Coast area. History After the end of the Tuscarora wars in 1713 and the forced removal of Native American tribes was followed by permanent settlement of the regi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicopter
A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of STOL (Short TakeOff and Landing) or STOVL (Short TakeOff and Vertical Landing) aircraft cannot perform without a runway. In 1942, the Sikorsky R-4 became the first helicopter to reach full-scale production.Munson 1968.Hirschberg, Michael J. and David K. Dailey"Sikorsky". ''US and Russian Helicopter Development in the 20th Century'', American Helicopter Society, International. 7 July 2000. Although most earlier designs used more than one main rotor, the configuration of a single main rotor accompanied by a vertical anti-torque tail rotor (i.e. unicopter, not to be confused with the single-blade monocopter) has become the most comm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vortex Ring State
The vortex ring state (VRS) is a dangerous aerodynamic condition that may arise in helicopter flight, when a vortex ring system engulfs the rotor, causing severe loss of lift. The vortex ring state is sometimes referred to as settling with power. The Federal Aviation Administration (FAA) sees these terms as synonymous, whereas Transport Canada sees them as two different phenomena. A vortex ring state sets in when the airflow around a helicopter's main rotor assumes a rotationally symmetrical form over the tips of the blades, supported by a laminar flow over the blade tips, and a countering upflow of air outside and away from the rotor. In this condition, the rotor falls into a new topological state of the surrounding flow field, induced by its own downwash, and suddenly loses lift. Since vortex rings are surprisingly stable fluid dynamical phenomena (a form of topological soliton), the best way to recover from them is to laterally steer clear of them, in order to re-establish li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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