Bharat Rakshak

Indranil

I have a word document to an article that a US pilot who flew against the MiG-29 of the Bulgarian AF wrote. MiG-29 fans will love that article, and what it does make clear is that with new generation avionics, radar, weapons and more internal fuel, a MiG-29 UPG (like that of the IAF) and the MiG-35...

Indranil

Self deleted: Purpose served!

Indranil

very true often decisions claimed to be based upon rationalism turns out to be the myth of rationality where stereotyping does play a significant role. interestingly the point of argument in the f22 flying on a single wing case in my opinion would be weather it would be combat worthy on one wing. i...

Indranil

In latest Mock up it seems that HAL is sticking with Conventional Tail rotor instead of shrouded tail rotor which was first displayed in Aero India 2009 model. Aero India model of LUH had shrouded tail rotor which is also known as Fenestron or Fantail in aviation circle. Our Defence expert Rajesh S...

Indranil

yes, the aircraft will have its longitudinal axis stay horizontal (or whatever angle decided), but wouldn't the plane loose altitude unless the axis is an angle to the ground where the thrust's vertical component balances the weight of the craft (which has already been discussed by Shiv)?! Actually...

Indranil

This is how a downsized Dhruv should look like: http://www.haf.gr/media/BK117_ps.jpg http://www.flugzeuginfo.net/acimages/bk117b2_kp.jpg AHA ... Back to the BK-177! Don't know, my friend, don't know .. Am a little worried about the single engined-high altitude LUH. Considering that the intended ran...

Indranil

Those tentacles need not be vile! Weed out the tentacles according to our need. That should be the smartest way, isn't it? Unfortunately, we will continue to depend on imports for some time to come. Earlier we had one gate, now we seem to have 4 (counting Israel and EU). That in my opinion gives you...

Indranil

Rahulda, extremely valid point that the C-17s may be overpriced! But the C-17s are not being sold to us at 580million. Actually the break up puts the planes at around 250 million or so. Its the after sales service which is so expensive. Somehow, from personal experience they make a huge deal out of ...

Indranil

I guess there was a lot of discussion about the S duct thing, and the compressor blades may or may not be visible. At 2.23 in this video clearly shows the compressor blades: http://www.youtube.com/watch?v=Mgb6NyxU3mI&feature=related Please go back some pages and read ... this has been extensive...

Indranil

kuldipchager wrote:Saab with one engine/LCA with two engines.

do you mean a 2 engined LCA!

Indranil

^^^ AGreed. I have often fought for the same ideals. Many people of my generation have told me that their parents didn't know whats best for them and I go ... hmmmm As far as I am with you on this, I believe that we shouldn't just shun and rubbish US things because they are from US. Likewise we shou...

Indranil

Plus, once a tank is loaded and chained down in an aircraft, it does not move, not even by a 10th of a mm. Really?!!!! Not even in an air pocket, not while landing?!! As far as I know when a truck goes over a bridge it flexes. You are saying the plane's hull won't?! Viv S gave an example when the i...

Indranil

Now I assume that you did not know about the F15 having flown on one wing. If you really did not know about the F 15 incident, may I ask what made you choose the F-22 as an example to quote? Except that I knew about it. In fact I had watched the whole episode when it came on TV! If you read some of...

Indranil

This message self destructed

Indranil

I already mentioned how the C-5A Galaxy was structurally modified internally into the C-5C to carry NASA rockets, rockets that could not fit in regular C-5s. It did not require a new fuselage. Or a new wing. Was the internal diameter increased at the wing joins? In the late-1980s, NASA had two C-5A...

Indranil

self deteted

Indranil

I have a few clarifications to make and a few questions to ask. Clarifications 1. What I wanted to say is that pilot input and control response is instantaneous. This is desired 2. Rajeev, I never meant to say that my friends words have more weight than yours. I work in high performance computing. S...

Indranil

yes, the aircraft will have its longitudinal axis stay horizontal (or whatever angle decided), but wouldn't the plane loose altitude unless the axis is an angle to the ground where the thrust's vertical component balances the weight of the craft (which has already been discussed by Shiv)?!

Indranil

Shiv, I think you have put a statement of mine from the PAK-FA discussion board here without the whole context. The point being discussed there was very very different. We were discussing the wake of the wing (for some other discussion), which is defined by it's shape and the amount of lift it requi...

Indranil

The question is whether a blended wing body design with short canted tailfins reduce body+tailfin lift in a 90 degree roll. Boss imho a considerably high TWR and the fact that those tailfins are completely movable (unlike the smaller rudder on conventional designs) should address the issue. I think...

Indranil

By the way, here is the reply from one of my friends, whom I inquired from. I don't know whether I should divulge his identity, but you can take it form me that he is a knowledgeable guy. In all real-life control systems (that includes FCS, formula one cars, spacecraft, rover landers etc) measuremen...

Indranil

^^^ I read the paper that you pointed out. I also read a few more papers cited in that paper. Alas, there seems to be no mention of the rates that we are speaking of. Does any body here know anybody from CLAW?!!! Rajeev, you yourself being from the control fields might know sombody :wink: Also, this...

Indranil

But wouldn't the development/experience/upgrade of cheetal's come in handy for the LOH! Actually when I read of a possible re-tender, my first reaction was the same as prateek's -> "HAL seize the opportunity". A heartfelt wish for HAL shot straight through my mind, "HAL, just convince...

Indranil

Rajeev, I understand what you are saying. I believe what you are saying will work, at least in theory. Your model is simple, find the instantaneous deviation, find the instantaneous correction. There is no reason why it shouldn't work as the deviation in control surfaces that would be required at 1/...

Indranil

Say the computer calculates the elevator deflection at t=0 seconds based on the sensor readings at t=0, but since the actuator moves only twice per second this does not get transferred to the elevator, now since the control law runs at 80Hz the value of the elevator deflection keeps getting updated...

Indranil

Hey Shiv I do not want to anger anybody. I have had issues when using FBW with control surface at updation rates below 20Hz on a general aviation aircraft. Maybe ACMR means that the bandwidth on the elevator actuator is 2Hz and not that the surfaces move twice every second. On the power requirement...

Indranil

I was going through the LCA thread and I saw Kartik's post regarding Diverterless Supersonic Intake (DSI). However, the question that comes to mind is what advantage does DSI provide over intake splitter plate and how? Does it increase simplicity by reducing the no of moving parts required in the i...

Indranil

I have a question: Since Kaveri engine is giving dry thurst of 52kn and dogfights are happening only on subsonic speed then why is there need to go for 95 kn AB engine? What are the uses of Afternburner other than: 1. Reaching the troubled spot to intercept on supersonic speed. 2. Running away from...

Indranil

But even then the edge separation would set off earlier, isn't it ? No it is not. One can read about the F-16 XL project which had a cranked arrow design. Though that wing had three steps, it wing join is very similar to the LCA. Pic: http://attach.high-g.net/attachments/f16xl_112.jpg Similar to th...

Indranil

indranilroy wrote: I think it is a turbulator!

I was right. Harry had written here http://forum.keypublishing.com/archive/ ... 16857.html

... wing area is measured only upto the intakes below the turbulator(crank) point so ...

Indranil

But even then the edge separation would set off earlier, isn't it? Is it a compromise made for the above advantages as enough AoA can be achieved otherwise? Or is there something else ? Remember the discussion few days back about a crack in the LCA wing!!! can see it here http://www.bharat-rakshak....

Indranil

Lovely, illuminating discussion! Reading this, I was wondering why the LCA didn't have canards, if they're so useful. I found this: The unique cranked-delta design, and the overall aircraft structure with significant wing-fuselage blending, etc. allows for incredible manoverability without the need...

Indranil

A new video with PAK FA was published in Internet I am so much not used to seeing movable LERXs :). They are awesome! I am like a little boy here, singing is is a LERX, is it a canard :P. Oh and by the way, I forgot to post about the elevators and wings being inline. I have to say that it is hearsa...

Indranil

Isnt this being set up or proposed by the MOD and GOI.Therefore why the indecent haste in the C-17 order.The reason is that Gates has given the thumbs down to Boeing on future orders and they have to dump the production line unless new orders are placed hence the IAFs buy! With the revelations that...

Indranil

Vina and Kartik thanks a lot for the clarifications. Indeed, what was I thinking!! Shiv thanks a lot for the article! To show myself down more let me add one more observation, the air brakes are almost above the elevons! so the moment arm length will be the same. So which designer in his right mind ...

Indranil

Saaar I was under the impression that the thundaaar-Bandaar was a more conservative airframe without relaxed static stability(or at least less unstable than the tejas). The compound delta on the tejas would certainly help with reducing drag and maintaining energy. The cleaner airframe would also he...

Indranil

Can someone give me an honest answer to this perplexing Q.The US denies us open collaboration on the naval LCA ,forcing us to go to the Europeans,but still preaches to us that the F-18SH is what we should buy for the MMRCA contest.How on earth can we trust it and shouldnt the MOD AKA openly tell of...

Indranil

So many who couldn't see a use for a 65 T payload, suddenly see the 150 T fitting in perfectly well. Speaking about being unbiased ....

AN-124 is no doubt a wonderful plane!

Indranil

Anujan wrote:AoA is not limited by the ability of an aircraft to pitch its nose upward. Above the critical angle of attack, an aircraft will stall, go into a flat spin and drop like a stone out of the sky.

I am aware of that! I am just speaking of getting a bigger moment to get to the required the desired AoA

Indranil

Given the position of the airbrakes near the tail, can we use them in semi deployed state in a pitching role, almost like a elevator to increase AoA! Does anybody know of such usage, or can somebody disprove such usage (may be from the drag point of view)? May be this is not at all required as the p...

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