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Flap
Flap may refer to: Arts, entertainment, and media * ''Flap'' (film), a 1970 American film * Flap, a boss character in the arcade game '' Gaiapolis'' * Flap, a minor character in the film '' Little Nemo: Adventures in Slumberland'' Biology and healthcare * Flap (surgery), a surgical technique involving movement of vascularized tissue ** Free flap, a specific kind of surgical flap * 5-lipoxygenase activating protein (FLAP) Computing and networks * The phenomenon of some variable or resource oscillating or alternating rapidly between two states ** Route flapping, when a network router flips between different routes ** Link flap, errant behavior in a communications link Engineering and design * Flap (aeronautics), a lift augmentation device on an airplane wing, often near the trailing edge * Flapping, the up-and-down motion of a helicopter rotor * Flap, any hinged plate often used as a cover or a simple one-way valve ** Sluice or flap gate, a pressure driven water flow contr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flap (aeronautics)
A flap is a high-lift device used to reduce the stalling speed of an aircraft wing at a given weight. Flaps are usually mounted on the wing trailing edges of a fixed-wing aircraft. Flaps are used to reduce the take-off distance and the landing distance. Flaps also cause an increase in drag so they are retracted when not needed. The flaps installed on most aircraft are partial-span flaps; spanwise from near the wing root to the inboard end of the ailerons. When partial-span flaps are extended they alter the spanwise lift distribution on the wing by causing the inboard half of the wing to supply an increased proportion of the lift, and the outboard half to supply a reduced proportion of the lift. Reducing the proportion of the lift supplied by the outboard half of the wing is accompanied by a reduction in the angle of attack on the outboard half. This is beneficial because it increases the margin above the stall of the outboard half, maintaining aileron effectiveness and redu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flap (surgery)
Flap surgery is a technique in plastic and reconstructive surgery where any type of tissue is lifted from a donor site and moved to a recipient site with an intact blood supply. This is distinct from a graft, which does not have an intact blood supply and therefore relies on growth of new blood vessels. This is done to fill a defect such as a wound resulting from injury or surgery when the remaining tissue is unable to support a graft, or to rebuild more complex anatomic structures such as breast or jaw. Uses Flap surgery is a technique essential to plastic and reconstructive Surgery. A flap is defined as a tissue that can be moved to another site and has its own blood supply. This is in comparison to a skin graft which does not have its own blood supply and relies on vascularization from the recipient site. Flaps have many uses in wound healing and are used when wounds are large, complex, or need tissue and bulk for successful closure. Common uses: * Abdominal wall r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flap Consonant
In phonetics, a flap or tap is a type of consonantal sound, which is produced with a single contraction of the muscles so that one articulator (such as the tongue) is thrown against another. Contrast with stops and trills The main difference between a tap or flap and a stop is that in a tap/flap there is no buildup of air pressure behind the place of articulation and consequently no release burst. Otherwise a tap/flap is similar to a brief stop. Taps and flaps also contrast with trills, where the airstream causes the articulator to vibrate. Trills may be realized as a single contact, like a tap or flap, but are variable, whereas a tap/flap is limited to a single contact. When a trill is brief and made with a single contact it is sometimes erroneously described as an (allophonic) tap/flap, but a true tap or flap is an active articulation whereas a trill is a passive articulation. That is, for a tap or flap the tongue makes an active gesture to contact the target place of artic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flapping
Flapping or tapping, also known as alveolar flapping, intervocalic flapping, or ''t''-voicing, is a phonological process found in many varieties of English, especially North American, Cardiff, Ulster, Australian and New Zealand English, whereby the voiceless alveolar stop consonant phoneme is pronounced as a voiced alveolar flap , a sound produced by briefly tapping the alveolar ridge with the tongue, when placed between vowels. In London English, the flapped is perceived as a casual pronunciation intermediate between the "posh" affricate and the "rough" glottal stop . In some varieties, , the voiced counterpart of , may also be frequently pronounced as a flap in such positions, making pairs of words like ''latter'' and ''ladder'' sound similar or identical. In similar positions, the combination may be pronounced as a nasalized flap , making ''winter'' sound similar or identical to ''winner''. Flapping of is sometimes perceived as the replacement of with ; for example ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roof Flap
A roof flap is an aerodynamic feature on race cars, mainly stock cars, which functions as an emergency spoiler to prevent the vehicle from lifting off the ground. The flaps are stowed during normal vehicle operation; however, in certain situations, e.g., if the vehicle goes into a spin, particularly if it is facing backwards, the flaps deploy to disrupt the air flow over the roof and reduce the lift force on the vehicle. First required in 1994, NASCAR now mandates that cars in the Cup and Xfinity series have two roof flaps positioned near the rear of the vehicle, with the left flap oriented perpendicular to the length of the car and the right flap angled 45° counter-clockwise (when looking downward) from the left flap. Trucks in the Camping World Truck Series only have the angled flap, due to the smaller roof area of the pickup truck type greenhouse and lower overall lift potential of the body shape. Originally, the flaps each measured wide by tall. Following several incide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bird Flight
Bird flight is the primary mode of locomotion used by most bird species in which birds take off and fly. Flight assists birds with feeding, breeding, avoiding predators, and migrating. Bird flight is one of the most complex forms of locomotion in the animal kingdom. Each facet of this type of motion, including hovering, taking off, and landing, involves many complex movements. As different bird species adapted over millions of years through evolution for specific environments, prey, predators, and other needs, they developed specializations in their wings, and acquired different forms of flight. Various theories exist about how bird flight evolved, including flight from falling or gliding (the ''trees down'' hypothesis), from running or leaping (the ''ground up'' hypothesis), from ''wing-assisted incline running'' or from '' proavis'' (pouncing) behavior. Basic mechanics of bird flight Lift, Drag and Thrust The fundamentals of bird flight are similar to those of aircraf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mudflap
A mudflap or mud guard is used in combination with the vehicle fender to protect the vehicle, passengers, other vehicles, and pedestrians from mud and other flying debris thrown into the air by the rotating tire. A mudflap is typically made from a flexible material such as rubber that is not easily damaged by contact with flying debris, the tire, or the road surface. On bicycles the mudflap is called a spoiler. It helps keep the rider(s) cleaner. Mudflaps can be large rectangular sheets suspended behind the tires, or may be small molded lips below the rear of the vehicle's wheel wells. Mudflaps can be aerodynamically engineered, utilizing shaping, louvers or vents to improve airflow and lower drag. While some flaps are plain, in the colour of rubber, many contain company logos, other art or sometimes advertisements. Another is the mudflap girl, a woman's silhouette. In the United States, there are mudflap regulations that vary from state to state. Aerodynamic Aerodyna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pet Door
A pet door or pet flap (also referred to in more specific terms, such as cat flap, cat door, kitty door, dog flap, dog door, or doggy/doggie door) is a small opening to allow pets to enter and exit a building on their own without needing a human to open the door. Originally simple holes, the modern form is a hinged and often spring-loaded panel or flexible flap, and some are electronically controlled. They offer a degree of protection against wind, rain, and larger-bodied intruders entering the dwelling. Similar hatches can let dogs through fences at stiles. A related concept is the pet gate, which is easy for humans to open but acts as a secure pet barrier. Purpose A pet door is found to be convenient by many owners of companion animals, especially dogs and cats, because it lets the pets come and go as they please, reducing the need for pet-owners to let or take the pet outside manually, and curtailing unwanted behaviour such as loud vocalisation to be let outside, scratching o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicopter Rotor
A helicopter main rotor or rotor system is the combination of several rotary wings (rotor blades) with a control system, that generates the aerodynamic lift force that supports the weight of the helicopter, and the thrust that counteracts aerodynamic drag in forward flight. Each main rotor is mounted on a vertical mast over the top of the helicopter, as opposed to a helicopter tail rotor, which connects through a combination of drive shaft(s) and gearboxes along the tail boom. The blade pitch is typically controlled by the pilot using the helicopter flight controls. Helicopters are one example of rotary-wing aircraft (rotorcraft). The name is derived from the Greek words ''helix'', helik-, meaning spiral; and ''pteron'' meaning wing. Design principles Overview The helicopter rotor is powered by the engine, through the transmission, to the rotating mast. The mast is a cylindrical metal shaft that extends upward from—and is driven by—the transmission. At the top of the m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bum Flap
The term bum flap or butt flap refers in one usage to the rear flap in a union suit, In this usage, it is also sometimes termed as ''crap flap'', ''evacuation flap'', or with some other euphemism. In another usage ( train hopping), the term refers to a piece of removable material that hangs from the waist to cover a person's buttocks. The external flap is of ambiguous origin, but probably was originally intended to reduce abrasive wear to pants. Sitting or sliding on a rough surface can rapidly wear the seat of pants, and flaps act as replaceable buffer material. They also provide some protection from damp or cold surfaces. The freely swinging flap dries faster than wet pants, and can be easier to clean. Bum flaps are often worn as a superfluous fashion statement, usually emblazoned with punk iconography. Flaps are usually constructed by hand with the most suitable material available, often canvas or denim from discarded clothing. Water resistant and thermally insulating flaps a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Route Flapping
In computer networking and telecommunications, route flapping occurs when a router alternately advertises a destination network via one route then another, or as unavailable and then available again, in quick sequence. Route flapping is caused by pathological conditions (hardware errors, software errors, configuration errors, intermittent errors in communications links, unreliable connections, etc.) within the network which cause certain reachability information to be repeatedly advertised and withdrawn. For example, link flap occurs when an interface on a router has a hardware failure that causes the router to announce it alternately as "up" and "down". In networks with link-state routing protocols, route flapping will force frequent recalculation of the topology by all participating routers. In networks with distance-vector routing protocol A distance-vector routing protocol in data networks determines the best route for data packets based on distance. Distance-vector routi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Link Flap
Link flap is a condition where a communications link alternates between ''up'' and ''down'' states. Link flap can be caused by end station reboots, power-saving features, incorrect duplex configuration or marginal connections and signal integrity Signal integrity or SI is a set of measures of the quality of an electrical signal. In digital electronics, a stream of binary values is represented by a voltage (or current) waveform. However, digital signals are fundamentally analog in nature, ... issues on the link. References {{networking-stub Computer networking ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
