Sorry for the Layman Question , Is there any cost involved to maintain these Missiles ? did our Fighters always fly locked and loaded with BVR's ? or they been mounted in war times or some serious situations ?
Hi,
Great question:---
Yes there is a cost involved in maintenance---that is why you would hardly ever see a Paf aircraft flying one with a real one---.
There is one part described below and there is another part---you pull the missile out of the air conditioned storage facility---nice tcool temperature---you mount it on the aircraft---outside temp is around 90* F---aircraft flies to 30000 ft where the temp is aroun -40*---such a massive variation in temp---the seal get hard---air stressess---air craft come down---a rapid increase in temp---condensation form moisture---moisture inside creates other problems---over time the case may have minute fractures---.
So---yes---there is a cost involved.
https://www.quora.com/Do-all-IR-guided-missiles-need-to-be-cryogenically-cooled.
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3 Answers
Desiree Arceneaux, works at The Royal Manticoran Navy: The Official Honor Harrington Fan Association
Answered Nov 30, 2015
There
used to be uncooled ones; the very earliest versions of the Sidewinder (AIM-9A and AIM-9B) and Falcon (GAR-2 and GAR-2A) missiles used uncooled IR seekers, but all later IR-guided missiles have used cooled seekers. This is because an IR seeker is inherently blind to anything that isn't significantly hotter than the seeker itself; a cooled seeker is
much more sensitive and capable than an uncooled sensor.
The IR-guided members of the Falcon series missiles gained a cooled seeker in the GAR-4A (later renamed AIM-4G) "Super Falcon" and GAR-2B (later renamed AIM-4D) Falcon; the GAR-2B was basically the Super Falcon's improved seeker backfitted onto the smaller, older GAR-2 body. The AIM-4G / AIM-4D seeker used nitrogen cooling from a bottle mounted in the missile rail, which provided about two minutes of seeker cooling time once activated.
The first Sidewinders with a cooled head were Germany's AIM-9B-FGW Mod.2, the U.S. Navy's AIM-9D, and the U.S. Air Force's AIM-9E. The AIM-9D used liquid nitrogen cooling like the Falcon had, but with a much larger six-liter bottle providing 2.5 hours of seeker cooling time*. The AIM-9E used thermoelectric cooling for
unlimited seeker cooling time as long as the missile had power. The later unified joint models of the AIM-9 series which are shared by the Navy and Air Force (AIM-9L and onwards) use argon gas cooling, except for the very latest AIM-9X which uses a Stirling cycle cooler.
*this massive increase in cooling time was introduced because of experience in Vietnam. The Air Force preferred Falcons over Sidewinders because it was an Air Force project rather than a Navy project, so the Air Force version of the Navy-designed F-4 Phantom II fighter-bomber was modified to carry Falcons. But unlike the F-106 Delta Dart interceptor with its highly sophisticated Hughes MA-1 fire control system, the F-4 could not automatically spin up the missile cooling during the lock-on sequence. Instead, the pilot had to manually activate the cooling and often did so much too early, causing the missile to run out of coolant before it could reach the target. "
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Rohit Bugalia, studied at Kendriya Vidyalaya No.2, Colaba
Answered Nov 29, 2015
IR guided missiles ,which uses the
infrared (IR) light emission from a target to track and follow it.
These missiles use
infrared seekers to track a target . The three main materials used in the infrared sensor are lead(II) sulfide (PbS), indium antimonide (InSb) and mercury cadmium telluride(HgCdTe).
Major point of IR guided missile is the
ability to discriminate between different heat sources and their respective backgrounds which depends on the seeker head's own temperature. Therefore, the seeker head of an active missile is cooled up to minus 160 degrees Celsius in order to establish optimal sensitivity.
Earlier missiles used 6 litre nitrogen bottles in the missile laucher , providing for 2.5 hours of seeker cool down. Some missiles use
peltier thermoelectric cooler ,allowing unlimited cooling time while the missile is on the launch rail .
Modern all-aspect missiles like the AIM 9M Sidewinder and Stinger
use compressed gas like argon to cool their sensors in order to lock onto the target at longer ranges and all aspects.
IR GUIDED MISSILE ( TIP OF THE MISSILE IS HEAT SEEKER) ".