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PostPosted: 20 Jan 2011 14:15 
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Arya Sumantra wrote:
It is better to leave it to mission planner or local command to assess situation and risk and accordingly load rather than putting a restrictive upper limit


agreed. That may mean less than 6 missiles. Have you managed to find out how many missiles per sortie were carried on average for NATO/US CAP? That should shut me up good and proper if you can quote from somewhere.

Quote:
World over the AFs must be stupid then to sport medium and heavy fighters with more pylons then ! They should all have only light fighters ! :roll:

Your words not mine. If you can quote the number on average carried by F-14s, F-15s, F-16s and F/A 18s on CAP that would give us both a better idea of what is actually being done by people whose planes can carry at least 6 missiles.

Quote:
Either you accept that one can kill many and thus reason out not to join numbers game OR as you said single pilot gets single kills and match upto their numbers with your own massive numbers. Take your pick.

Reasoning is no substitute for the hard reality that history forces down one's throat. It is mostly one kill per mission. At the most 2. Even with fighters with the capacity to carry 6 or more missiles. No sidestepping reality.


Quote:
As I said before, 10 or 12 aams/plane are just extreme examples being talked to make an idea appear easily unacceptable. For the sake of discussion here can we stick to 6 aams ?

If we are going to stick to 6 AAM - what aircraft are you talking about. MiG 21? Tejas? Su-30? JF-17? J-10? F-16? Mirage 2000? F/A 18? There is no escape from power and weight restrictions.


Quote:
But your point is simply not to build the ability to carry 6 and have NO provisions for emergency ! This is unreasonable.

Bogey. No point wasting time on things I have not said. :P


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PostPosted: 20 Jan 2011 15:45 
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Here are photographs relevant to the question of missiles carried on a CAP sortie.

http://www.f-16.net/gallery_item26833.html

http://www.defense.gov/photos/newsphoto ... otoid=2097

http://www.177fw.ang.af.mil/shared/medi ... 0F-039.JPG
Image caption
Quote:
A US Air Force (USAF) F-16C Fighting Falcon aircraft, 177th Fighter Wing (FW), Atlantic City International Airport, New Jersey (NJ), drops away above the USA from a USAF KC-135R Stratotanker, 157th Air Refueling Wing (ARW), Pease Air National Guard Base (ANGB), New Hampshire (NH) after being refueled. This is a Combat Air Patrol (CAP) tanker mission in support of Operation NOBLE EAGLE. The F-16 is armed with AIM-120A Advanced Medium Range Air-to-Air Missiles (AMRAAM) on the wingtips and AIM-9 Sidewinder Missiles on the outboard pylons. In addition, it has two 370-gallon External Fuel Tanks for long loitering flight time. (U.S. Air Force photo/Staff Sgt. Dawn Finniss)


F-15s on CAP on this page
http://sharpshooter-maj.com/html/port02.htm

F-14 on CAP
http://farm4.static.flickr.com/3252/296 ... 49de_b.jpg
caption:
Quote:
underside view of a Fighter Squadron 41 (VF-41) F-14A Tomcat aircraft on a Combat Air Patrol (CAP) during Operation Desert Storm gulf war. The aircraft is carrying four AIM-7 Sparrow missiles under its fuselage and two AIM-9 Sidewinder missiles on each wing pylon.


After much searching I found only a few images of aircraft on pure CAP sortie - mostly with 4 or 6 missiles - all in aircraft capable of carrying more even without multiple missile launcher pylons. I wonder why. Are the world's air forces stupid? Not really. It makes sense to carry more fuel in drop tanks and drop them for combat, keeping your plane light and agile rather than hyper arming them with AAM like what is done for propaganda photos.

Lots of photos of aircraft on strike missions carrying self defence AAMs.


Last edited by shiv on 20 Jan 2011 18:15, edited 1 time in total.

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PostPosted: 20 Jan 2011 17:17 
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Location: Ya kundendu tushar haar dhavala ..
I think for a buyer's(until now) Air Force like ours the size of the inventory might be a factor as well i.e. number of missiles of a particular type, it's shelf life and the life on a pylon might govern the loadout of an AC during peacetime (anyways afaik most of the times they use training rounds).


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PostPosted: 20 Jan 2011 19:13 
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Okay.....my replies might be naive but I would really appreciate if seniors reply to it....how else am I supposed to learn???? :| :|


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PostPosted: 20 Jan 2011 23:48 
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Shiv Sir,
This article echoes your sentiment to some extent. It was published in the vayu some time back.
Preparing For Armageddon


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PostPosted: 21 Jan 2011 12:54 
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shiv wrote:
Have you managed to find out how many missiles per sortie were carried on average for NATO/US CAP?

What for? Let’s see the hole in the history you are deriving parallels from. Uncle and nato braced themselves for numbers game in standoff against russkie and (now)dragon fighters. BUT they end up fighting against tiny nobodies(in airpower at least) like Iraq and yugoslavia fielding even russkie fighters in small numbers and not even flying them. How many fighters did Iraq fly against khan? And faced with such diminished threat when they fly with lower aam payload for better agility in offensive role, you bring their images of usual payload and post them as history that will repeat itself on sub-continent in completely different situation !!!

Uncle prepared for but NEVER fought (russkies and dragon) playing numbers game. So all your posted images of their usual payload are inapplicable to local scenario. And, are you unable to see the asymmetry both in numbers and technology in the history you cite and our situation on 2 fronts? Does such asymmetry exist here?

History teaches us lessons PROVIDED the conditions are SAME.

As I said before, nearly one in few sorties will be action packed. You would either knock out enemy or get knocked down.

shiv wrote:
If we are going to stick to 6 AAM - what aircraft are you talking about. MiG 21? Tejas? Su-30? JF-17? J-10? F-16? Mirage 2000? F/A 18? There is no escape from power and weight restrictions.

Tejas. Take a look at max aam capability of gripen, eff-solah, Mirage 2000- similar single enginned fighters with similar restrictions in Wikipedia. For jf17 and j10 the numbers are not listed. Gripen: 6× Rb.74 (AIM-9) or Rb 98 (IRIS-T), eff-solah: 2× AIM-7 Sparrow or 6× AIM-9 Sidewinder or 6× IRIS-T or 6× AIM-120 AMRAAM or 6× Python-4, Mirage 2000: 6× MBDA MICA IR/RF, 2× Matra R550 Magic-II and 2× Matra Super 530D

Of course I would love to see far more numbers of Tejas each fielding fewer than max for better agility but I am aware that such numbers will not be allowed by vested folks to be in place in times it is needed the most due to interplay of order size and production rate.

shiv wrote:
It makes sense to carry more fuel in drop tanks and drop them for combat, keeping your plane light and agile rather than hyper arming them with AAM like what is done for propaganda photos.

Ofcourse, but that is possible when you have more numbers of fighters each of which could carry fewer aams on and keep them agile. but once all your available fighters are busy and mission rate is max, what is the next step?
Secondly agility is not a constant but after firing bvraams your fighters become nimble once again. For defense this works fine as there are no enemy SAMs in your territory to worry about.

shiv wrote:
Arya Sumantra wrote:
Either you accept that one can kill many and thus reason out not to join numbers game OR as you said single pilot gets single kills and match upto their numbers with your own massive numbers. Take your pick.

Reasoning is no substitute for the hard reality that history forces down one's throat. It is mostly one kill per mission. At the most 2. Even with fighters with the capacity to carry 6 or more missiles. No sidestepping reality.

Since you believe it is one kill per mission, are you able to execute mission rates several multiples of that of rivals in the same time frame to knock out superior numbers ? And they are going to wait and come in appropriate batch sizes and suitable arrival rate to give you time to fly down and replenish another 2 aams for next sortie !!

Numbers game you start railing out against
then
Missiles per plane we know your stand
then
Mission rates or sortie rate possible- I am assuming equal or ours may be marginally better not much. Availability should depend on maintenance, spares inventory, condition etc.

So unless you believe our sortie rates can be multiples of that of our rivals, what madarsa balance are you using ? to counterbalance the force projected on us.

shiv wrote:
Lots of photos of aircraft on strike missions carrying self defence AAMs.

Tejas is “multi-role” and will do everything that a similar config Gripen or eff-solah(if bought) as an mrca is expected to do. Don’t understand your obsession with CAP simply because it will replace Mig21s(relic from era of role specific fighters)

negi wrote:
I think for a buyer's(until now) Air Force like ours the size of the inventory might be a factor as well i.e. number of missiles of a particular type, it's shelf life and the life on a pylon might govern the loadout of an AC during peacetime (anyways afaik most of the times they use training rounds).

Negiji, conflicts are expensive. You have to spend more on either the fighters or on aams or both. Enemy is not knocked out by simply taking to air in a plane you think superior(one on one). That’s why astra is so important and for numbers Tejas so that whatever we spend goes into our economy, creates our expertise and above all saves forex in wartime exchange rates which will be unfavourable to us. But extortionists will see to it that they deprive us of affordable homegrown options by playing the order size-production rate game.


Last edited by Arya Sumantra on 21 Jan 2011 13:44, edited 1 time in total.

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PostPosted: 21 Jan 2011 13:26 
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HI I AM ABHISHEK .I joined BR today


Last edited by Jagan on 21 Jan 2011 22:03, edited 1 time in total.
Removed Personal infomation - Not required to be disclosed


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PostPosted: 21 Jan 2011 13:52 
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Arya Sumantra wrote:
Since you believe it is one kill per mission, are you able to execute mission rates several multiples of that of rivals in the same time frame to knock out superior numbers ? And they are going to wait and come in appropriate batch sizes and suitable arrival rate to give you time to fly down and replenish another 2 aams for next sortie !!

Numbers game you start railing out against
then
Missiles per plane we know your stand
then
Mission rates or sortie rate possible- I am assuming equal or ours may be marginally better not much. Availability should depend on maintenance, spares inventory, condition etc.

So unless you believe our sortie rates can be multiples of that of our rivals, what madarsa balance are you using ? to counterbalance the force projected on us.


:D We are not going to agree. I have already stated my skepticism about your "load every aircraft with as many missiles as possible and to hell with range and agility" concept.

Since the only new information you are able to bring on board is a query about my alma mater which you believe is a madarsa, the weight and validity of your argument has not changed but its direction has veered off topic. I will stop here unless you can think of something more credible that what you have heroically managed to muster so far. Sorry sir. Feeble, but not unexpected.


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PostPosted: 21 Jan 2011 14:13 
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Just a thought...

"Victory will smile upon those who anticipate changes in the character of war, not upon those who wait to adapt themselves after changes occur."

---General Giulio Douhet
The Command of the Air’, 1921


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PostPosted: 21 Jan 2011 14:28 
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^^ have read that somewhere but not sure where...


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PostPosted: 21 Jan 2011 15:19 
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Cross posting from Indian Navy thread

Singha wrote:
the shallow green waters of andaman sea and south china sea are not really suitable for larger SSNs.
This stirs up a stupid sounding query in my mind. Say its war time, and China sends a large SSN in our waters and gets grounded in those shallow Andaman waters and our P8s detect it and ask them to surrender. If the *deleted* refuse, is it wise to bomb the SSN out considering they're in our waters and it would be detrimental to our environment and populace if anything happens to the reactor inside the SSN?

I'd have a similar query about a nuclear bomber like B1 lancer flying over our territory? Would it be wise to shoot it down?


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PostPosted: 21 Jan 2011 21:39 
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shiv wrote:
Since the only new information you are able to bring on board is a query about my alma mater which you believe is a madarsa, the weight and validity of your argument has not changed but its direction has veered off topic.

Nope, not referring to your alma mater, rather a balance operating on madarsa logic.
But anyways agree to disagree.


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PostPosted: 22 Jan 2011 10:40 
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A very touching video on tarmak. Great work by AVM Lamba(who is 75) and AK
http://tarmak007.blogspot.com/2011/01/blogging-for-cause-tarmak007-teams-up.html


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PostPosted: 22 Jan 2011 11:37 
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Dmurphy I think the navies do map the sea bed (something which submarines and other oceanographic vessels do during peacetime), also when we say not suitable for SSN I am not clear as to what it implies , for instance average depth of Bay of Bengal is over 2600 meters(wiki) which is about 5 times the depth a SSN can dive upto. Having said that yes operation in littoral waters comes with a risk of higher chances of being detected as against operating in midst of Indian ocean.


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PostPosted: 22 Jan 2011 16:24 
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Dmurphy wrote:
Cross posting from Indian Navy thread

Singha wrote:
the shallow green waters of andaman sea and south china sea are not really suitable for larger SSNs.
This stirs up a stupid sounding query in my mind. Say its war time, and China sends a large SSN in our waters and gets grounded in those shallow Andaman waters and our P8s detect it and ask them to surrender. If the *deleted* refuse, is it wise to bomb the SSN out considering they're in our waters and it would be detrimental to our environment and populace if anything happens to the reactor inside the SSN?

I'd have a similar query about a nuclear bomber like B1 lancer flying over our territory? Would it be wise to shoot it down?


I would not be worried about a nuclear payload carrying bomber being shot because frankly the nuclear weapons are probably the best armored item in the bomber and more than the bomber itself since the warhead casing has to contain the fission reaction long enough for the internal temperature to reach 100 million centigrade for fusion to occur. So a drop from a few thousand feet will only dent it.

For the stranded enemy sub unwilling to surrender and the headache of green peace launching a second or third front, we can do the following. Lay a mine field around the sub and let the crew succumb to their watery graves.


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PostPosted: 22 Jan 2011 22:13 
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For Wickberg and other friends of India:
The information might not be accurate since it is not based on official gazettes. It is best to obtain more information from official Govt. of India notifications if you wish to use this information for official purposes.
----------------------------------------------------------------------------------------
Official languages of India are Hindi and English (per the Constitution).

There are 24 other languages that are also recognized as the official languages. These are spoken in the respective states (some states also share multiple common languages).

The total number of languages (other than dialects) is over 2000. Almost 60% of Indians comprehend and speak Hindi and English. Nearly 80% of Indians are estimated to be trilingual. That might be underestimated though.


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PostPosted: 23 Jan 2011 08:25 
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Got this by email which I thought should be shared:
Quote:
1/2 boy 1/2 man


The average age of the army man is 19 years.
He is a short haired, tight-muscled kid who, under normal circumstances is considered by society as half man, half boy. Not yet dry behind the ears, not old enough to buy a beer, but old enough to die for his country. He never really cared much for work and he would rather wax his own car than wash his father's, but he has never collected unemployment dole either.

He's a recent college graduate; he was probably an average student from one of the Kendriya Vidyalayas, pursued some form of sport activities, drives a ten year old jalopy, and has a steady girlfriend that either broke up with him when he left, or swears to be waiting when he returns from half a world away. He listens to rock and roll or hip -hop or country or gazals or swing and a 155mm howitzer.


He is 5 or 7 kilos lighter now than when he was at home because he is working or fighting the insurgents or standing gaurd on the icy Himalayas from before dawn to well after dusk or he is at Mumbai engaging the terrorists. He has trouble spelling, thus letter writing is a pain for him, but he can field strip a rifle in 30 seconds and reassemble it in less time in the dark. He can recite to you the nomenclature of a machine gun orgrenade launcher and use either one effectively if he must.


He digs foxholes and latrines and can apply first aid like a professional.
He can march until he is told to stop, or stop until he is told to march.
He obeys orders instantly and without hesitation, but he is not without spirit or individual dignity. His pride and self-respect, he does not lack.

He is self-sufficient.
He has two sets of combat dress: he washes one and wears the other.
He keeps his water bottle full and his feet dry.
He sometimes forgets to brush his teeth, but never to clean his rifle. He can cook his own meals, mend his own clothes, and fix his own hurts.

If you're thirsty, he'll share his water with you; if you are hungry, his food. He'll even split his ammunition with you in the midst of battle when you run low.


He has learned to use his hands like weapons and weapons like they were his hands.
He can save your life - or take it, because that is his job.
He will often do twice the work of a civilian, draw half the pay, and still find ironic humor in it all.
He has seen more suffering and death than he should have in his short lifetime.

He has wept in public and in private, for friends who have fallen in combat and is unashamed.


He feels every note of theJana Gana Mana vibrate through his body while at rigid attention, while tempering the burning desire to 'square-away' those around him who haven't bothered to stand, remove their hands from their pockets, or even stop talking.


In an odd twist, day in and day out, far from home, he defends their right to be disrespectful.
Just as did his Father, Grandfather, and Great-grandfather, he is paying the price for our freedom.

Beardless or not, he is not a boy.
He is your nation's Fighting Man that has kept this country free and defended your right to Freedom. He has experienced deprivation and adversity, and has seen his buddies falling to bullets and maimed and blown.

But,


He has asked nothing in return, except our acknowledgement of his existence and understanding of his human needs.
Remember him, always, for he has earned our respect and admiration with his blood.
And now we even have women over there in danger, doing their part in this tradition of going to War when our nation calls us to do so.


As you go to bed tonight, remember this shot. . ..
A short lull, a little shade and a picture of loved ones in their helmets.

Prayer wheel for our military... please don't break it Please send this on after a short prayer.

Prayer Wheel


'Lord, hold our Indian Army in your loving hands.
Protect them as they protect us.
Bless them and their families for the selfless acts they perform
for us in our time of need.

Amen.'


When you receive this, please stop for a moment and say a prayer
for our soldier, sailors , and airmen , in all frontiers
There is nothing attached...
This can be very powerful...
Of all the gifts you could give a Soldier, Sailor, or Airman,
prayer is the very best one.


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PostPosted: 23 Jan 2011 23:58 
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^^^^marvelous


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PostPosted: 24 Jan 2011 02:32 
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I´m a "newbie" but still I have managed to anger a lot of people here and some of you might even heard of me (and rightfully hate me). My goal, or what I am trying to achieve, is not being hated or acting like some kind of renegade. I am what I am and who I am is the result of mine life, that being said it does not mean I can´t change myself and develop and learn more. Some people say "- You can´t teach old dogs new tricks." That is so wrong, every day we learn something new and develops, you can call it experience, I just call it living.

I thought I just post a short video showing my military service. This is from KA 5 Härnösand and the 6th Amphibious Battalion. I did my service along with these guys (they are anti-air platoon and I was in mortar platoon/coy) at the same time. You even see me in one of the photos (not telling you which). But we did the same basic training and shared the same shitty conditions. Brothers in arms...

(yeah, I know the music does´nt belong there. We are marines, not army.)

http://www.youtube.com/watch?v=pUau7IonCjw


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PostPosted: 24 Jan 2011 09:22 
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Gurus, Just like we have a litening pod, is it possible to have a radar pod for planes without radars such as trainers etc and sling them with a2g munitions and bvr aams ? The pod could also be slung onto aerostats(like the one drdo made recently) etc as a payload perhaps. Also it could be useful for fighters that have a good predominantly a2a radar but not good for a2g, the pod could become a secondary radar used for a2g while the primary radar in the nose used for a2a. It could either be pesa type or aesa(swash plate type).

Eventually an L-band pod could be developed as an optional carry on for 4th gen fighters.


Last edited by Arya Sumantra on 24 Jan 2011 11:51, edited 1 time in total.

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PostPosted: 24 Jan 2011 10:51 
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Quote:
Having said that yes operation in littoral waters comes with a risk of higher chances of being detected as against operating in midst of Indian ocean.


I am a little unsure about this sir.
I thought it is harder to detect a Sub in littoral waters as the clutter will be more then to detect one in deep waters.
Also, i believe it will be easief for MAD devices to detect a sub in deep waters then in shallow waters.


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PostPosted: 24 Jan 2011 11:58 
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i have a newbie doubt.... after NDA/IMA/OTA.. in what manner cadets are get commisioned to different regiments... is it kind of random or each regiment have any criteria...?


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PostPosted: 24 Jan 2011 12:23 
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jimmy_moh wrote:
i have a newbie doubt.... after NDA/IMA/OTA.. in what manner cadets are get commisioned to different regiments... is it kind of random or each regiment have any criteria...?

You can give your preference. The preference is given consideration but there is no guarantee that it will be accepted. Leave alone regiments, even the corps has no surety. So, in the end you can only hope that you get your desired regiment.

Of course, if you volunteer for Para. Then you get to wear that distinction during your passing out parade. Also, you have to fill another form relieving Army of any responsibility if anything unfortunate occurs during your training.


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PostPosted: 25 Jan 2011 06:50 
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Arya Sumantra wrote:
is it possible to have a radar pod for planes without radars such as trainers etc and sling them with a2g munitions and bvr aams ?


I am no radar guru but was trying to do a lot of radar related reading a few weeks ago and I recall a comment from Prodyut Das which was something like "Every inch added to radar diameter adds 1 mile (or 10 miles or something) to its range."

IOW the size of the radar antenna is crucial. In a pylon-slung pod - that diameter may not be big enough for BVR work. Just my guess.


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PostPosted: 25 Jan 2011 10:07 
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True Shivji but it is not an alternative location to those which already have a big one in the nose. It would be good to have one on radarless AJTs and IJTs with bvrs/wvrs slung on them to fall back on in desperate times atleast roles like defending rest of the country when all the main fighters are busy on northern and western frontiers. Also to add better ground capabilities to air defence Mig 21s and do on Mig21s what nose job on Mirage III cheetah did for south africa, as an example.
Image

Also during wartime there is no time to send fighters for upgrade overseas. This would be quickest way to improvise and add capability. A quote from wikipedia about Atlas Cheetah
Quote:
Though the Mirage F1s were the most modern of the fleet, having been delivered from 1977 onwards, they were the primary element of South Africa's air defence and strike fleet and to withdraw them for an upgrade would have left an unacceptable gap in its air defence and strike capability.


If looking up for a2a, it would have a "blind spot" in the area where it sees the part of host aircraft's fuselage, but atleast the rest is visible and for a2g that wouldn't be a limitation.

Also if you look at Gripen's nose it isn't really big but a bigger dia is accomodated by inclining it on a rotating swash plate. Also the eff solah's nose dia isn't impressively big either.
Image

A radar pod would be something intermediate between a litening pod dia and a drop tank dia.


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PostPosted: 25 Jan 2011 13:50 
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Arya Sumantra wrote:
A radar pod would be something intermediate between a litening pod dia and a drop tank dia.


I was doing a comparison of the base diameter of the nosecone of the Bundaar, J-10 ad Tejas and got a figure of something like 80-100 cm for all (can't recall the exact figure)

I am guessing that at least a 50 cm diameter would be achievable for something slung in a pod - maybe smaller for a trainer. I have no idea if anyone has attempted this.


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PostPosted: 25 Jan 2011 20:14 
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shiv wrote:
Arya Sumantra wrote:
A radar pod would be something intermediate between a litening pod dia and a drop tank dia.


I was doing a comparison of the base diameter of the nosecone of the Bundaar, J-10 ad Tejas and got a figure of something like 80-100 cm for all (can't recall the exact figure)

I am guessing that at least a 50 cm diameter would be achievable for something slung in a pod - maybe smaller for a trainer.

My estimate of SA’s Mirage III cheetah nose is 89 cm dia.

How about an improvised version of rear looking radar used in flanker tail sting for the pod in trainers ? It seems just a bit smaller than the right size, could be made bigger and or more power perhaps for better range.

Found this from an old article(2005) posted on a forum http://www.freefalcon.com/forum/showthr ... case-study

Quote:
Detection range, fighter-size target, tail-on 60 km


Quote:
The Su-35 has also a small radar installed inside the sting between the engines and looking aft. Such an idea has been developing in Russia since the mid-1980s: rear-looking radars were installed on several prototypes of the 'old' Su-27M/Su-35 (N012 radar designed by NIIR Rassvet), to the MiG 1.42 (Rassvet N015) and to the Su-27IB (V005 radar by Leninets). At the same time, tests were made of air-to-air missiles launched rearward. The interest in this concept declined and only came back in the early 2000s. The Tikhomirov NIIP institute suggests for this purpose its passive phased-array radar Osa and is expected to announce a new active phased-array radar of this class within the next few months.


shiv wrote:
I have no idea if anyone has attempted this.

There are always some firsts. New conflicts new precedents(Zoltan Dani). Whatever necessity demands.


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PostPosted: 26 Jan 2011 05:41 
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It occurs to me that many active radar guided missiles right from the 1950s have had their own seeker and compact seekers are available for police cars and small boats. Why not use a missile seeker as a radar?

The answer seems to be in the connection between radar detection range, beam width, frequency and antenna size. Lower frequencies are better for long range and require larger antennas. Shorter wavelengths (higher frequencies ) can do with smaller antenna sizes but are attenuated much more quickly and are useful for short ranges - sometimes as low as a few meters to a few km.
http://www.icxt.com/technology/infrared ... ral-bands/
Quote:
The selection of a radar's operating frequency is generally the result of a trade-off analysis that considers desired detection range, weather and clutter environment, available aperture size, properties of targets of interest and cost of RF components.

Radar performance must first be quantified on the basis of propagation efficiency in various media (air, foliage and ground) with respect to the required detection range. The general principle is that the lower the frequency, the more efficient the propagation of radio waves through the medium. In the presence of obscurants, propagation is most favorable when the RF wavelength is much larger than the particle size composing the propagation medium. This is why radars tend to have much better performance than optical systems through smoke, dust, fog and rain.

However, using a lower frequency dictates a larger antenna for a given angular resolution.


http://www.fas.org/man/dod-101/navy/doc ... darsys.htm
Quote:
the frequency of the radio carrier wave will also have some
affect on how the radar beam propagates. At the low frequency extremes, radar beams
will refract in the atmosphere and can be caught in "ducts" which result in long
ranges. At the high extreme, the radar beam will behave much like visible light and
travel in very straight lines. Very high frequency radar beams will suffer high
losses and are not suitable for long range systems.

The frequency will also affect the beam-width. For the same antenna size,
a low frequency radar will have a larger beam-width than a high frequency one.
In order to keep the beam-width constant, a low frequency radar will need a large
antenna.


And for stuff that goes above my head
http://www.radartutorial.eu/07.waves/wa04.en.html
Quote:
E/F-Band (S-Band Radar)

The atmospheric attenuation is higher than in D-Band. Radar sets need a considerably higher transmitting power than in lower frequency ranges to achieve a good maximum range. As example given the Medium Power Radar (MPR) with a pulse power of up to 20 MW. In this frequency range the influence of weather conditions is higher than in D-band. Therefore a couple of weather radars work in E/F-Band, but more in subtropic and tropic climatic conditions, because here the radar can see beyond a severe storm.

Special Airport Surveillance Radars (ASR) are used at airports to detect and display the position of aircraft in the terminal area with a medium range up to 50…60 NM (≈100 km). An ASR detects aircraft position and weather conditions in the vicinity of civilian and military airfields. The designator S-Band (contrary to L-Band) is good as mnemonic rhyme as smaller antenna or shorter range.
G- Band (C-Band Radar)

In G- Band there are many mobile military battlefield surveillance, missile-control and ground surveillance radar sets with short or medium range. The size of the antennas provides an excellent accuracy and resolution, but the relatively small-sized antennas don't bother a fast relocation. The influence of bad weather conditions is very high. Therefore air-surveillance radars use an antenna feed with circular polarization often. This frequency band is predetermined for most types of weather radar used to locate precipitation in temperate zone like Europe.
I/J- Band (X- and Ku- Band Radars)

In this frequency-band (8 to 12 GHz) the relationship between used wave length and size of the antenna is considerably better than in lower frequency-bands. The I/J- Band is a relatively popular radar band for military applications like airborne radars for performing the roles of interceptor, fighter, and attack of enemy fighters and of ground targets. A very small antenna size provides a good performance. Missile guidance systems at I/J- band are of a convenient size and are, therefore, of interest for applications where mobility and light weight are important and very long range is not a major requirement.

This frequency band is wide used for maritime civil and military navigation radars. Very small and cheap antennas with a high rotation speed are adequate for a fair maximum range and a good accuracy. Slotted waveguide and small patch antennas are used as radar antenna, under a protective radome mostly.

This frequency band is also popular for spaceborne or airborne imaging radars based on Synthetic Aperture Radar (SAR) both for military electronic intelligence and civil geographic mapping. A special Inverse Synthetic Aperture Radar (ISAR) is in use as a maritime airborne instrument of pollution control.
K- Band (K- and Ka- Band Radars)

The higher the frequency, the higher is the atmospheric absorption and attenuation of the waves. Otherwise the achievable accuracy and the range resolution rise too. Radar applications in this frequency band provide short range, very high resolution and high data renewing rate. In ATM these radar sets are called Surface Movement Radar (SMR) or (as p. o.) Airport Surface Detection Equipment (ASDE). Using of very short transmitting pulses of a few nanoseconds affords a range resolution, that outline of the aircraft can be seen on the radars display.


Last edited by shiv on 26 Jan 2011 07:52, edited 1 time in total.

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PostPosted: 26 Jan 2011 07:28 
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while you guys are on this topic, what are the issues with mounting the CABS AEW&C radar on the carrier based Mig-29k trainer version with some high speed data links to the carrier for additional operators?


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PostPosted: 26 Jan 2011 07:47 
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Chackojoseph's image of CABS AEW radar is linked below- and appears to be 8-9 meters long. That is half the length of a MiG 29 which does not appear to have the fuselage length to accommodate it above and the height below the belly to accommodate it below.
http://frontierindia.org/album/wp-conte ... _India.jpg


Last edited by shiv on 26 Jan 2011 07:53, edited 1 time in total.

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PostPosted: 26 Jan 2011 07:52 
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Shiv, the plan is to mount it on the spine of the Mig-29k, one mount point behind the pilot and the 2nd mount point somewhere close to the tail piece, not as a under slung pod

probably a single seater, the 8-9 metres is like the length of the brahmos which is shown to easily fit between the intake-engine longitudinal on the MKI, so above shouldn't be a problem


Last edited by vasu_ray on 26 Jan 2011 07:59, edited 1 time in total.

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PostPosted: 26 Jan 2011 07:55 
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vasu_ray wrote:
Shiv, the plan is to mount it on the spine of the Mig-29k, one mount point behind the 2nd pilot and the 2nd mount point somewhere close to the tail piece, not as a under slung pod


That is what I said. Please read my post again. I think it is too big. If you think it will work your expertise in the field may be better than mine - since mine is zero and I am merely stating my inexpert opinion. The tailfins will obstruct the "view" of the radar which defeats the purpose even if it were possible to mount it. And nothing is known in public about the weight.


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PostPosted: 26 Jan 2011 09:12 
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Brahmos required the MKI airframe be strengthened, so even the Mig-29k will have its weight limitations which can be worked on

the CABS radar is inclined vs the flight body and is mounted fairly high so the 2nd mount point can be designed to be folded while take-off and elevated above the tail height while in level/cruise flight

With the engines closely spaced relative the vehicle height, TVC might be helpful


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PostPosted: 26 Jan 2011 20:15 
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vasu_ray wrote:
Brahmos required the MKI airframe be strengthened, so even the Mig-29k will have its weight limitations which can be worked on

the CABS radar is inclined vs the flight body and is mounted fairly high so the 2nd mount point can be designed to be folded while take-off and elevated above the tail height while in level/cruise flight

With the engines closely spaced relative the vehicle height, TVC might be helpful


Ah! I see. A thrust vectoring MiG 29 with dorsally installed telescopic mounts to raise and lower the radar antenna holding the CABS radar to be used by the navy.

Nice. Very nice. Like transformers.


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PostPosted: 26 Jan 2011 23:26 
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Can WVRs be used to shoot down other missiles launched towards the aircraft? Almost a CIWS for the aircraft?


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PostPosted: 26 Jan 2011 23:29 
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Here are some Transformers:

[img]
http://en.wikipedia.org/wiki/File:Atlan ... rcraft.jpg
[/img]

From Wiki:

Flying with the additional drag and weight of the Orbiter imposes significant fuel and altitude penalties. The range is reduced to 1,000 nautical miles (1,850 km), compared to an unladen range of 5500 nautical miles (10,100 km),[3] requiring an SCA to stop several times to refuel on a transcontinental flight.

http://www.boeing.com/Features/2010/12/bds_phantom_ray_12_10_10.html

As with the 747, one can choose to find a nice fit between the above two extremes, given that the Mig-29k has a payload capability of 5.5 tons


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PostPosted: 27 Jan 2011 05:13 
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vasu_ray wrote:
Shiv, the plan is to mount it on the spine of the Mig-29k, one mount point behind the pilot and the 2nd mount point somewhere close to the tail piece, not as a under slung pod

probably a single seater, the 8-9 metres is like the length of the brahmos which is shown to easily fit between the intake-engine longitudinal on the MKI, so above shouldn't be a problem


The fighter has a RF transparent glass canopy through which all your radar emissions will come into the cockpit. As to how it will interfere with instruments, we don't know. They make you switch off even a small emitter cellphone on passenger flights whereas here you have a radar. And that too right behind pilot's head ! Although pilot would be wearing the conducting helmet but am not sure if it is grounded. Else sparks could appear between helmet and radar just like how they would if you left a metal spoon in a bowl in a microwave. Slinging underneath is better idea provided it is small enough. There was our first AEW radome mounted on a retired plane that crashed because the altered aerodynamics due to radome mounting were not taken into account.


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PostPosted: 27 Jan 2011 05:20 
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shiv wrote:
It occurs to me that many active radar guided missiles right from the 1950s have had their own seeker and compact seekers are available for police cars and small boats. Why not use a missile seeker as a radar?

Active homing aams have transceivers(transmitter-receivers) but afaik even these aams are command guided via datalink upto a certain distance by host fighter’s radar and only in its terminal phase or perhaps a little earlier is the aam guided by its own radar. So the range of aam’s radar is not as big as the range of the missile as it cannot guide it from the time it leaves the wing. The split guidance works fine given that nose of aam is so small for its radar. Also such emitters cannot track multiple targets I believe as they have only one victim to target.

Signal to Noise Ratio(SNR) varies as square of wavelength. If you reduce the wavelength to enable smaller aperture size the ratio will deteriorate as a square affecting the range.
-------------------------

There are 2 approaches that could be used inspite of a weak radar.

Approach 1: Assisted search
The analogy is searching in a huge dark conference hall illuminated only by a small ceiling bulb with a torch in hand. The faint illumination of ceiling bulb gives you a rough idea and which direction to go looking for and the torch in hand better illuminates the local area you are searching. The combination should work out better than scanning with a torch alone in a huge dark hall.
If a ground based mobile radar or airborne AEW guides in datalink with a trainer points out coordinates of threat to trainer and then switches off for safety, the trainer with its smaller radar can dash off towards coordinates and upon proximity it can use its own radar to narrow down threat precisely.

Approach 2: Shoot in the direction of emitter
This has been talked about on keypubs wherein the yanks say that when opponent in a dark room uses the torch you keep yours off and shoot in the direction of light. The trainer in this case with a weaker radar could still have a very sensitive receiver that would detect the emissions from enemy and upon not finding IFF signal could shoot in the direction of incoming radar waves.
One doubt I have however is that how would the trainer with its shorter range radar communicate its IFF to say a MKI returning home and avoid getting shot friendly?

Regardless of approaches used the datalink must be implemented on trainers as well.
-------------------------

If the dish is aesa type, you can accommodate a larger size elliptical dish in a smaller dia pod by inclining the dish by an angle (theta) equal to maximum beam steering angle possible by its modules.
Image

I still believe that if aesa type is not available, then flanker tail sting radar is right size though range needs to be worked upon. But for trainer’s pod we don’t need uber high specs, only need to reach target close to the specs of bandar’s radar(KLJ-7)
Look-up: >105 km (for RCS of 5 m2)
Look-down: >85 km (for RCS of 5 m2) (from wikipedia)

Su34 Fullback’s sting is the biggest among flankers- 70 cm in my estimate.
For the dimensions we are looking at, should inquire for specs of these 3 radars used in flanker stings/Light fighter nose - Pharaon, Rassvet No12, Tikhomirov OSA

Phazotron - Pharaon
http://www.janes.com/articles/Janes-Avi ... mpany.html
Quote:
Pharaon is a new multifunction X-band (NATO I-/J-band) airborne fighter radar, designed to offer comprehensive air-to-air and air-to-ground capabilities. Pharaon is a relatively lightweight radar marketed as a nose fire-control radar for light fighters, or as the tail cone radar for heavy fighter aircraft.


Phazotron/Rassvet N012
http://webcache.googleusercontent.com/s ... clnk&gl=sg
Quote:
N012 OKB: NIIR Rassvet Tail radar used on Su-35/37 operating at decimetric wavelengths which is installed in the long tail boom between the tail pipes. This radar forms part of the aircraft's defensive aids sub-systems suite (DASS) and warns the crew of approaching threats in the rear hemisphere as well as controlling active and passive jamming responses to such threats. Claimed to have a range of 50km for a 3 sq m RCS fighter, or 100km for a large aircraft. Scans 60° in azimuth and elevation.


http://webcache.googleusercontent.com/s ... clnk&gl=sg
Quote:
Last of all, the rear boom of the Su-35BM, mentioned above, will also house a radar, smaller in size and facing to the rear. For now, the choice remains open. It is known that Sukhoi has already tested the N012 rear-facing radar of NIIR Rassvet of Ryazan on its Su-27M's, a simple alert device functioning in decimeter waves. The same Rassvet has tested the N015 radar on the MiG 1-42, in centimeter waves and capable of designating targets with missiles that can be fired to the rear.

Tikhomirov is already offering its Osa electronic scanning rear face radar and is announcing an active-antenna version of it for the end of the year. In the same category, Phazotron has had the Pharaoh (or Kopyo-F) radar in its product range for several years, and last April in Moscow presented a Kopyo-DL active-antenna version in the decimeter band, the caliber of which adapts to the rear boom of the Su-35.


The drop tank dia of Hawk AJT in my estimates is 40 cm. A bit too small. Either a slightly bigger one could be developed or the current one be used for modification shown below. SH already does this for its IRST which is mounted on a drop tank. If the radar back end gets too heated the probe could either be rid off or better insulated and partition can be made wider to easily avoid fuel from reaching flash point. Standardize this drop tank for IJT Sitara as well.
Image

Auxiliary application: The flanker tail sting radar could also be used to convert Akash into an active homing sam from a command guided sam so that its guiding radar on ground can switch off after initial guidance and move to safety while the onboard radar takes over.

------------

shiv wrote:
And for stuff that goes above my head
http://www.radartutorial.eu/07.waves/wa04.en.html
Quote:
E/F-Band (S-Band Radar)
The atmospheric attenuation is higher than in D-Band.
…………………………………………
Radar applications in this frequency band provide short range, very high resolution and high data renewing rate. In ATM these radar sets are called Surface Movement Radar (SMR) or (as p. o.) Airport Surface Detection Equipment (ASDE). Using of very short transmitting pulses of a few nanoseconds affords a range resolution, that outline of the aircraft can be seen on the radars display.

Am not an Elec engg guy either. Describing “eccentricities” of different range of wavelengths(bands) and how they differ especially in terms of absorbance(range-limiting), scattering, detection equipment compactness(detection materials(bandgap) are wavelength specific) even though they all fall within RF. rest is beyond me too

JMT


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PostPosted: 27 Jan 2011 14:02 
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Mig 21 has a nose cone base of about 46 cm dia and russkies offer a Kopyo radar that can fire R77, good enough for trainer pod, although it is a pulse doppler type


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PostPosted: 28 Jan 2011 00:25 
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jamwal wrote:
Can someone please post the exact coordinates of places in PoK where Chinese construction is going on ?


Bump!


How many tank regiments can be possibly adjusted in a single base ? Not the whole Strike Corps kind, but on a smaller size.


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