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Pugachev's Cobra
In aerobatics, the cobra maneuver (or just the ''cobra''), also called ''dynamic deceleration'', among other names , is a dramatic and demanding maneuver in which an airplane flying at a moderate speed abruptly raises its nose momentarily to a vertical and slightly past vertical attitude, causing an extremely high angle of attack and making the plane into a full-body air brake, momentarily stalling the plane, before dropping back to normal position, during which the aircraft does not change effective altitude. The maneuver relies on the ability of the plane to be able to quickly change angle of attack (alpha) without overloading the airframe, and sufficient engine thrust to maintain nearly constant altitude through the entire move, but also post-stall stability and aerodynamics that allows for the recovery to level flight. The maneuver demands accurate pitch control, alpha stability and engine-versus-inlet compatibility for the aircraft, as well as a high skill level on the par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saab 35 Draken
The Saab 35 Draken (; ''The Kite'', ambiguous with ''The Dragon'') is a Swedish interceptor aircraft, fighter-interceptor developed and manufactured by Saab AB, Svenska Aeroplan Aktiebolaget (Saab AB, SAAB) between 1955 and 1974. Development of the Saab 35 Draken started in 1948 as the Swedish Air Force future replacement for the then also in development Saab 29 Tunnan day fighter and Saab 32 Lansen, Saab 32B Lansen night fighter, all-weather fighter. It featured an innovative but unproven Delta wing#Design variations, double delta wing, leading to the creation of a sub-scale test aircraft, the Saab 210, which was produced and flown to test this previously unexplored aerodynamic feature. The full-scale production version entered service with frontline squadrons of the Swedish Air Force on March 8, 1960. It was produced in several variants and types, most commonly as a Fighter aircraft, fighter-Interceptor aircraft, interceptor. The Saab 35 Draken is known for, among other things ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cobra
COBRA or Cobra, often stylized as CoBrA, was a European avant-garde art group active from 1948 to 1951. The name was coined in 1948 by Christian Dotremont from the initials of the members' home countries' capital cities: Copenhagen (Co), Brussels (Br), Amsterdam (A). History During the time of occupation of World War II, the Netherlands had been disconnected from the art world beyond its borders. CoBrA was formed shortly thereafter. This international movement of artists who worked experimentally evolved from the criticisms of Western society and a common desire to break away from existing art movements, including the "detested" naturalism and the "sterile" abstraction. Experimentation was the symbol of an unfettered freedom, which, according to Constant, was ultimately embodied by children and the expressions of children. CoBrA was formed by Karel Appel, Constant, Corneille, Christian Dotremont, Asger Jorn, and Joseph Noiret on 8 November 1948 in the Café Notre-Dame, Pari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subsonic Aircraft
A subsonic aircraft is an aircraft with a maximum speed less than the speed of sound (Mach 1). The term technically describes an aircraft that flies below its critical Mach number, typically around Mach 0.8. All current civil aircraft, including airliners, helicopters, future passenger drones, personal air vehicles and airships, as well as many military types, are subsonic. Characteristics Although high speeds are usually desirable in an aircraft, supersonic flight requires much bigger engines, higher fuel consumption and more advanced materials than subsonic flight. A subsonic type therefore costs far less than the equivalent supersonic design, has greater range and causes less harm to the environment. The less harsh subsonic environment also allows a much wider range of aircraft types, such as balloons, airships and rotorcraft, allowing them to fill a much wider range of roles. Subsonic aerodynamics Subsonic flight is characterised aerodynamically by incompressible flow, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pugachev Cobra
In aerobatics, the cobra maneuver (or just the ''cobra''), also called ''dynamic deceleration'', among other names , is a dramatic and demanding maneuver in which an airplane flying at a moderate speed abruptly raises its nose momentarily to a vertical and slightly past vertical attitude, causing an extremely high angle of attack and making the plane into a full-body air brake, momentarily stalling the plane, before dropping back to normal position, during which the aircraft does not change effective altitude. The maneuver relies on the ability of the plane to be able to quickly change angle of attack (alpha) without overloading the airframe, and sufficient engine thrust to maintain nearly constant altitude through the entire move, but also post-stall stability and aerodynamics that allows for the recovery to level flight. The maneuver demands accurate pitch control, alpha stability and engine-versus-inlet compatibility for the aircraft, as well as a high skill level on the par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MiG-21F-13
This is a list of variants and specifications for variants of the Mikoyan-Gurevich MiG-21, which differed considerably between models. Variants All information in this section adapted from ''MiG-21'' (2008).Gordon, Yefim. ''Mikoyan MiG-21'' (Famous Russian aircraft). Hinckley: Midland, 2008. . Development and preproduction – Generation Zero (1954–1956) ; (1954) :Preliminary swept-wing design around the Mikulin AM-5A non-reheated turbojet. Instead of building it, the design was quickly reworked into the Ye-2. ; (1954; NATO: "Faceplate") :Swept-wing prototype with Mikulin AM-9B reheated turbojet, armed with three NR-30 cannon, and could carry one UB-16-57 rocket pod. Fitted with RSIU-4 VHF radio, ''Uzel'' IFF interrogator, ARK-5 ''Amur'' automatic direction finder with RUP landing approach computer, MRP-48P ''Dyatel'' marker beacon receiver, SRO-2 ''Khrom'' IFF transponder, ''Sirena-2'' RWR, SRD-1M ''Radal'-M'' radar rangefinder linked to an ASP-5N computing gunsight. Ye-2 mad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syria
Syria, officially the Syrian Arab Republic, is a country in West Asia located in the Eastern Mediterranean and the Levant. It borders the Mediterranean Sea to the west, Turkey to Syria–Turkey border, the north, Iraq to Iraq–Syria border, the east and southeast, Jordan to Jordan–Syria border, the south, and Israel and Lebanon to Lebanon–Syria border, the southwest. It is a republic under Syrian transitional government, a transitional government and comprises Governorates of Syria, 14 governorates. Damascus is the capital and largest city. With a population of 25 million across an area of , it is the List of countries and dependencies by population, 57th-most populous and List of countries and dependencies by area, 87th-largest country. The name "Syria" historically referred to a Syria (region), wider region. The modern state encompasses the sites of several ancient kingdoms and empires, including the Eblan civilization. Damascus was the seat of the Umayyad Caliphate and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deceleration
In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Acceleration is one of several components of kinematics, the study of motion. Accelerations are vector quantities (in that they have magnitude and direction). The orientation of an object's acceleration is given by the orientation of the ''net'' force acting on that object. The magnitude of an object's acceleration, as described by Newton's second law, is the combined effect of two causes: * the net balance of all external forces acting onto that object — magnitude is directly proportional to this net resulting force; * that object's mass, depending on the materials out of which it is made — magnitude is inversely proportional to the object's mass. The SI unit for acceleration is metre per second squared (, \mathrm). For example, when a vehicle starts from a standstill (zero velocity, in an inertial frame of reference) and travels in a straight line at increasing spe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynamics (mechanics)
In physics, dynamics or classical dynamics is the study of forces and their effect on motion. It is a branch of classical mechanics, along with ''statics'' and ''kinematics''. The ''fundamental principle of dynamics'' is linked to Newton's second law. Subdivisions Rigid bodies Fluids Applications Classical dynamics finds many applications: * ''Aerodynamics'', the study of the motion of air * '' Brownian dynamics'', the occurrence of Langevin dynamics in the motion of particles in solution * '' File dynamics'', stochastic motion of particles in a channel * ''Flight dynamics'', the science of aircraft and spacecraft design * ''Molecular dynamics'', the study of motion on the molecular level * '' Langevin dynamics'', a mathematical model for stochastic dynamics * '' Orbital dynamics'', the study of the motion of rockets and spacecraft * '' Stellar dynamics'', a description of the collective motion of stars * '' Vehicle dynamics, the study of vehicles in motion Generalizations ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riposte
In fencing Fencing is a combat sport that features sword fighting. It consists of three primary disciplines: Foil (fencing), foil, épée, and Sabre (fencing), sabre (also spelled ''saber''), each with its own blade and set of rules. Most competitive fe ..., a riposte ( French for "retort") is an offensive action with the intent of hitting one's opponent made by the fencer who has just parried an attack. In military usage, a riposte is the strategic device of hitting a vulnerable point of the enemy, thereby forcing them to abandon their own attack. In everyday language, a riposte is synonymous with a retort and describes a quick and witty reply to an argument or an insult. Etymology In sabre and foil, the priority switches when the parry is successfully executed; the defending fencer now has ''right of way'' and may immediately attack with a riposte. The riposte may be direct, or may include compound footwork. If the riposte is delayed, the original attacker's remis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beat (fencing)
This is a glossary of terms used in fencing. A B C D E F G H I J L M N O P Q R S T V W Y Historical and foreign fencing terminology Note that the vocabulary here is primarily a glossary of modern fencing terms. Over time, the terminology has evolved, and different terminology may be found in Medieval and Renaissance sources.Association for Renaissance Martial ArtsHistorical Fencing Term ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fencing
Fencing is a combat sport that features sword fighting. It consists of three primary disciplines: Foil (fencing), foil, épée, and Sabre (fencing), sabre (also spelled ''saber''), each with its own blade and set of rules. Most competitive fencers specialise in one of these disciplines. The modern sport gained prominence near the end of the 19th century, evolving from historical European swordsmanship. The Italian school of swordsmanship, Italian school altered the Historical European martial arts, historical European martial art of classical fencing, and the French school of fencing, French school later refined that system. Scoring points in a fencing competition is done by making contact with the opponent with one's sword. The 1904 Olympic Games featured a fourth discipline of fencing known as singlestick, but it was dropped after that year and is not a part of modern fencing. Competitive fencing was one of the first sports to be featured in the Olympics and, along with Athl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
