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A flare or decoy flare is an aerial infrared countermeasure used by an aircraft to counter an infrared homing ("heat-seeking") surface-to-air missile or air-to-air missile. Flares are commonly composed of a pyrotechnic composition based on magnesium or another hot-burning metal, with burning temperature equal to or hotter than engine exhaust.
The most common method of infrared countermeasure is deploying flares, as the heat produced by the flares creates hundreds of targets for the missile. Conventional man-portable air defense systems ( MANPADS )-launched missiles include an infrared sensor that is sensitive to heat, for example the heat emitted from an aircraft engine.
A flare, also sometimes called a fusée, fusee, or bengala, [1] [2] bengalo [3] in several European countries, is a type of pyrotechnic that produces a bright light or intense heat without an explosion. Flares are used for distress signaling, illumination, or defensive countermeasures in civilian and military applications. Flares may be ground ...
The very high reaction enthalpy, , upon combustion of magnesium with PTFE is based on the formation of magnesium fluoride, having a very high negative enthalpy of formation ( = −1124 kJ mol −1): 2 n Mg + (C 2 F 4 ) n → 2 n MgF 2 (s) + 2 n C, Δ R H {\displaystyle \Delta _{\mathrm {R} }H} = −1438 kJ mol −1 (1)
Strontium nitrate – most common oxidizer/colorant for red colors in flares, fires, and stars; strontium also serves as a stabilizer for the mixtures. [4] At lower temperatures (with organic fuels) produces strontium nitrite ash which can smother the flame; decomposes completely at higher temperatures (with magnesium).
During the America's Got Talent auditions Tuesday night, married couple Flora and Nico, also known as Duo Rings, performed a mesmerizing and alluring aerial act that had judges Heidi Klum, Sofia ...
A modern LUU-2B flare at 1,000 feet altitude illuminates the ground at 5 lux in a radius of 1500 feet. Burn time is 4–5 minutes. The flare is 36 inches long, 4.9 inches in diameter, and weighs about 30 pounds. A similar design called LUU-19B can provide covert illumination in the near-infrared (IR) spectrum with virtually no visual signature.
April 9, 2024 at 1:57 PM As skies darkened Monday over North America during a rare solar eclipse , many people noticed bright dots — flickering spots that were reddish, pink and orange in hue ...
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