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Night-fighter
A night fighter (also known as all-weather fighter or all-weather interceptor for a period of time after the Second World War) is a fighter aircraft adapted for use at night or in other times of bad visibility. Night fighters began to be used in World War I and included types that were specifically modified to operate at night. During the Second World War, night fighters were either purpose-built night fighter designs, or more commonly, heavy fighters or light bombers adapted for the mission, often employing radar or other systems for providing some sort of detection capability in low visibility. Many night fighters of the conflict also included instrument landing systems for landing at night, as turning on the runway lights made runways into an easy target for opposing intruders. Some experiments tested the use of day fighters on night missions, but these tended to work only under very favourable circumstances and were not widely successful. Avionics systems were greatly mini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heavy Fighter
A heavy fighter is a historic category of fighter aircraft produced in the 1930s and 1940s, designed to carry heavier weapons, and/or operate at longer ranges than light fighter aircraft. To achieve performance, most heavy fighters were twin-engine, and many had multi-place crews; This was in contrast to light fighters, which were typically single-engine and single-crew aircraft. In Germany, they were known as ''Zerstörer'' ("destroyer"). The heavy fighter was a major design class during the pre-World War II period, conceived as long-range escort fighters or heavily-armed bomber destroyers. Most such designs failed in this mission, as they could not maneuver with the more conventional, single-engine fighters, and suffered heavy losses. Most notable among such designs was the Messerschmitt Bf 110, which suffered great losses during the Battle of Britain. An exception was the American Lockheed P-38 Lightning, which proved an effective heavy fighter; even against smaller, lighter, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fighter Aircraft
Fighter aircraft are fixed-wing military aircraft designed primarily for air-to-air combat. In military conflict, the role of fighter aircraft is to establish air superiority of the battlespace. Domination of the airspace above a battlefield permits bombers and attack aircraft to engage in tactical and strategic bombing of enemy targets. The key performance features of a fighter include not only its firepower but also its high speed and maneuverability relative to the target aircraft. The success or failure of a combatant's efforts to gain air superiority hinges on several factors including the skill of its pilots, the tactical soundness of its doctrine for deploying its fighters, and the numbers and performance of those fighters. Many modern fighter aircraft also have secondary capabilities such as ground attack and some types, such as fighter-bombers, are designed from the outset for dual roles. Other fighter designs are highly specialized while still filling the ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tactical Air Navigation System
A tactical air navigation system, commonly referred to by the acronym TACAN, is a navigation system used by military aircraft. It provides the user with bearing and distance (slant-range or hypotenuse) to a ground or ship-borne station. It is a more accurate version of the VOR/ DME system that provides bearing and range information for civil aviation. The DME portion of the TACAN system is available for civil use; at VORTAC facilities where a VOR is combined with a TACAN, civil aircraft can receive VOR/DME readings. Aircraft equipped with TACAN avionics can use this system for en route navigation as well as non-precision approaches to landing fields. The Space Shuttle is one such vehicle that was designed to use TACAN navigation but later upgraded with GPS as a replacement. The typical TACAN onboard user panel has control switches for setting the channel (corresponding to the desired surface station's assigned frequency), the operation mode for either transmit/receive (T/R, to get ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Victoria Cross
The Victoria Cross (VC) is the highest and most prestigious award of the British honours system. It is awarded for valour "in the presence of the enemy" to members of the British Armed Forces and may be awarded posthumously. It was previously awarded by countries of the Commonwealth of Nations, most of which have established their own honours systems and no longer recommend British honours. It may be awarded to a person of any military rank in any service and to civilians under military command. No civilian has received the award since 1879. Since the first awards were presented by Queen Victoria in 1857, two-thirds of all awards have been personally presented by the British monarch. The investitures are usually held at Buckingham Palace. The VC was introduced on 29 January 1856 by Queen Victoria to honour acts of valour during the Crimean War. Since then, the medal has been awarded 1,358 times to 1,355 individual recipients. Only 15 medals, of which 11 to members of the Britis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SL 11
SL may refer to: Arts and entertainment * SL (rapper), a rapper from London * ''Second Life'', a multi-user 3D virtual world * Sensei's Library, an Internet site dedicated to the game of Go * Subdominant leittonwechselklänge * Leica SL, a mirrorless system camera by Leica Camera AG Business and organizations * Sociedad Limitada, the Spanish version of a private limited company Politics * Serbian Left (''Srpska levica''), a political party in Serbia * Stronnictwo Ludowe, a defunct Polish political party * Soyons Libres, a French political party Transportation and vehicles * SL Corporation, a Korean auto parts company * Rio Sul Serviços Aéreos Regionais (IATA code SL), a Brazilian airline * Salt Lake City Southern Railroad (reporting mark SL) * Stor-Oslo Lokaltrafikk, a public transport operator in Akershus, Norway * Storstockholms Lokaltrafik, the public transport operator in Stockholm, Sweden * Thai Lion Air (IATA airline code SL) * Mercedes-Benz SL-Class, an automobile ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leefe Robinson
William Leefe Robinson VC (14 July 1895 – 31 December 1918) was the first British pilot to shoot down a German airship over Britain during the First World War. For this, he was awarded the Victoria Cross (VC), the highest award for gallantry in the face of the enemy that can be awarded to British and Commonwealth forces. He was the first person to be awarded the VC for action in the UK. His action marked a turning point in the war against the airship menace, and caused the German airship bombing campaign to falter. In the three months afterwards, five more airships were shot down using the combat techniques he had proven. Early life Robinson was born in Coorg, India, on 14 July 1895, the youngest son of Horace Robinson and Elizabeth Leefe. Raised on his parents' coffee estate, Kaima Betta Estate, at Pollibetta in Coorg, he attended Bishop Cotton Boys' School, Bangalore, and the Dragon School, Oxford, before following his elder brother Harold to St Bees School, Cumberl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Captain (land)
The army rank of captain (from the French ) is a commissioned officer rank historically corresponding to the command of a company of soldiers. The rank is also used by some air forces and marine forces. Today, a captain is typically either the commander or second-in-command of a company or artillery battery (or United States Army cavalry troop or Commonwealth squadron). In the Chinese People's Liberation Army, a captain may also command a company, or be the second-in-command of a battalion. In some militaries, such as United States Army and Air Force and the British Army, captain is the entry-level rank for officer candidates possessing a professional degree, namely, most medical professionals (doctors, pharmacists, dentists) and lawyers. In the U.S. Army, lawyers who are not already officers at captain rank or above enter as lieutenants during training, and are promoted to the rank of captain after completion of their training if they are in the active component, or af ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Operational B
An operational definition specifies concrete, replicable procedures designed to represent a construct. In the words of American psychologist S.S. Stevens (1935), "An operation is the performance which we execute in order to make known a concept." For example, an operational definition of "fear" (the construct) often includes measurable physiologic responses that occur in response to a perceived threat. Thus, "fear" might be operationally defined as specified changes in heart rate, galvanic skin response, pupil dilation, and blood pressure. Overview An operational definition is designed to model or represent a concept or theoretical definition, also known as a construct. Scientists should describe the operations (procedures, actions, or processes) that define the concept with enough specificity such that other investigators can replicate their research. Operational definitions are also used to define system states in terms of a specific, publicly accessible process of preparation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
