GuardianRED
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Like i Said Face valueNot sure if you had a chance to read the comments on the link I posted (where I conversed under the the name 'Scrutator'); but essentially he has claimed that no missile in the world has an external bottle of coolant cooling the missile's IR seeker (when it's still on launcher). Where in fact almost every prominent missile with IR seeker (Javelin, R-73, Sidewinder etc) does have external coolant injected into the missile to cool the seeker while it's still on the launcher. The question came up in the context of if Helina uses a cooled or uncooled seeker. I even posted the lecture video of the Helina's project director where he clearly states that the launcher provides cooling to the missile for 2 hours per sortie. However, he seems to argue that Helina uses uncooled seeker and further HE helped DRDO design the system with some heat insulation. To be honest I don't have any latest information on Helina's design (if it has changed recently) - but Helina was always designed with a cooled seeker. But his claim that external coolant to any missile's seeker violates laws of physics in pure baloney!!!
I agree with you that one has to consume information from a lot of sources, and then use one's own logic and commonsense to a make up ones mind.
I have seen several people write authoritatively on subjects with little knowledge. The Trishul guy is unique in a way that he does have access to some extraordinary information but also some complete BS (I guess that makes him like everyone else ).
The worst was when he kept denying for almost a year that there was something called Tejas Mk1A. Only because Ajai Shukla broke the news first (who he hates from the gut) and Trishul dude didn't know if the news was true or not. Subsequently, the defense minister, HAL chief etc kept talking about Mk1A, but this dude kept writing on his blog that Mk1A is a myth; that no more Tejas would be built with F404 engines; that Mk2 with F414 would be the only aircraft built after the initial order of 20/40. After nearly a year of loud denials, he silently switched to talking about Mk1A
On the link I posted earlier, you can see that he's blowing a lot of hot air; contradicting himself. And he posted and deleted my last post where I point out his contradictions.
Still, playing the other side of this debate
First , The Tejas MK1A
I have been following his blog for a very long time and also following the LCA program from when it started ( was in college when i saw the PV1 take off - good times).
Now , when what i understand - Prasun doesn't acknowledge any new system unless it officially has some documentation or institution backs it up. (and with good reason as we have the worst defence related journalist in the world with horrible reporting and rehashing same old stories for decades without provided any new info).
Taking the Case of the Tejas, all of us know that in 2010 there was flaws with the Mk1 and that it was underpowered etc etc etc ... It was at that same specs for Mk2 was developed this is backup by engineering drawings , models etc by ADA and HAL (official sources). It was ONLY last Year the that the talks abt the MK1A came about, (many of us was WTF?? .. what abt the Mk2). The sources was only a spokesman from HAL and news reports ... thats abt it!... Even now there is only a list of specs available, other than that no official drawings , models etc , no official confirmation that the NLCA will be the bases for the Mk1A . Only Confirmation we have is that the IAF has sanctioned 80+ frames ... thats it (only then Prasun acknowledge the existence of the Mk1A)
Coming to the Cooling system, sorry im not familiar with the system other than what i read.
From the blog comments
Scrutator : Most cooled IR seeker based missiles use some kind of external cooling.
Javelin missile launcher has a Dewar cooling flask on the launcher that cools the IR seeker inside the missile during the target acquisition phase. Once the missile is launched the external connection to the coolant is severed and an internal coolant bottle (much smaller one) is activated.
Prasun :The cooling flask you’re referring to is not meant to cool the Javelin missile’s seeker, but rather the target acquisition seeker on the re-usable manportable launcher itself, i.e. the same principle used by re-usable shoulder-launched MANPADS launchers. Once electrical power is supplied & the missile is activated, the internal cooler of the Javelin takes over under the lock-on-before-launch mode & it takes about 40 seconds to fully function. On AAMs the coolant is embedded inside the missile itself & no coolant pours in from any outside source. Once any cannister-encased missile like an ATGM leaves its tube, the flight-time is no more than 20 seconds—hardly any time therefore for the seeker to be degraded even at 55 degrees Celsius outside temperature
NOW from this site
http://www.inetres.com/gp/military/infantry/antiarmor/Javelin.html
I read the following:
M98A1 COMMAND LAUNCH UNIT (CLU)
- Daysight. The daysight works much like a telescope and consists of a lens, status indicators, and an eyepiece. The daysight:
- Provides the gunner a visible-light image with 4X magnification for target viewing and battlefield surveillance.
- Can be used with power off for surveillance only to save battery life.
- Is not affected by infrared clutter.
- Night Vision Sight. The NVS is the primary sight used by the gunner. The NVS is an imaging infrared (I²R) system, used during day or night. It allows the gunner to see during conditions of limited visibility including darkness, obscuration, smoke, fog, inclement weather, and IR clutter. The NVS operates by converting an infrared target image to a visible-light image for the gunner. The NVS consists of the NVS lens, detector Dewar cooler, CLU display and eyepiece provides the gunner with both a 4X (WFOV) and 9X (NFOV) magnification for scanning and target detection.
- Detector Dewar cooler (DDC) cools the NVS to the proper operating temperature and converts infrared energy to electrical signals. These signals are sent to the CLU display by way of the signal processor to provide the gunner a picture of the target area
and
The LTA serves as the launch platform and carrying container for the missile. It is a single-piece, composite graphite/epoxy design. The launch tube protects the missile from the environment before the missile is launched. All other LTA components mount externally on the tube. Once the missile is launched, the LTA is discarded.
The Battery Coolant Unit : BCU has the battery section and a compressed-gas coolant section. The battery section powers the missile electronics before missile launch. The coolant section cools the missile seeker to its operating temperature before missile launch. The BCU is a single-use unit with 4 minutes of operating time and is not rechargeable. Once the missile has been fired, the spent BCU is discarded with the LTA.
Soooo... from what i get from this ....IS... that the CLU has an internal cooling system Independent from the Launch Tube and the Launch Tube - have an external cooling systems and not internal on the missile/seeker (Here Prasun reply mostly refers to the CLU initially where its the BCU at the same time warms the missile - What he gets wrong is the just the terminologically and Its NOT INTERNAL)
on other MPATGMs.... whether they have internal cooling or not (ie to counter Prasun comments) Still researching , will get back on that
On the Helina
To this
As u can see , it was pretty much a open tube to now a sealed one
On the cooling system and seeker, just give me time, do some research and come back to you
Cheers
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