Bharat Rakshak

Raman

What do you think of the slight angled setting (LE slightly up than TE at same lateral section) of the inboard section of the wing (the one with lower sweep angle)?? My guess is that the leading consideration for the geometry of the bottom surface of the wing at that location is regulation of obliq...

Raman

RE: using LCA for CAP vs strike and MiG-29K vs LCA, I thought I'd add my $0.02. Any mistakes in understanding are entirely mine. Carrier air wing sizing is a complicated problem. The primary determinant is the carrier doctrine (in context of the threats and capabilities of the possible foes): everyt...

Raman

Let's not lose sight of the fact that we are arguing here because ADA has just said LCA will need to drag its butt for another YEAR to get FOC. Why is anyone defending this rubbish? Or is it acceptable? Neither ADA/HAL nor IAF appears to have a clue on running a de novo fighter program. There is en...

Raman

AVM Matheswaran was simply stating that the consultants ADA hired had recommended the canard-delta layout early in the design stage because of the imposed size limitations but ADA/HAL ignored the advice. Configuration changes are not made on the basis of gut feeling - they require a large number of...

Raman

Not regularly keeping up and just saw your post - you did not complete your math which I did a while back. Here is my calc Assume 65K carrier requires 6 LM2500 engines (going by 4 for 40K IAC) Fuel consumption per hour in lb = 6 turbines * 0.354 SFC lb/shp-hr (from GE site) * 40,500 shp = 86K lb Fu...

Raman

Indranil, The syllabus is not online. So this is all speculation on your part and mine. This is not IAF, but unless you think the IAF's syllabus is drastically different than the US Navy: T-45 COMBINED MULTI-SERVICE PILOT TRAINING SYSTEM CNATRA INSTRUCTION 1542.167 CNATRAINST 1542.167 N715 18 Sep 1...

Raman

After Zarb-e-Azm, Gen Raheel Sharief proceeds to Washington D.C. for Zarb-e-Zeb.

Raman

I didn't see any red bags. Are you referring to the orange life preservers? Those are just flotation devices ...

Raman

No jiziya collector will issue receipt; if he does some greener jiziya collecter will come to collect jiziya from him or even bull-cattle him.

Raman

Courage is a cross-generational family value in land of the brave

Raman

Intakes are sized as per required mass flow - an larger intake that attempts to push more air into the engine than the engine's mass flow rating will only result in spillage drag.

Raman

It might even be a bit deeper than that. As I see it, there have been many reports of the Pak army/ISI wanting to "test" Modi shortly. Modi is setting up a "deja vu" situation with (a) BJP/NDA government, (b) Nawaz Sharif and (c) "meeting for peace onlee" - what happene...

Raman

I'd like to get the definitive range numbers - the advertised range (i.e., 300 kms) doesn't seem to square well with LCA's fuel fraction and engine SFC (which are comparable with Gripen).

Raman

With all the measurements, specifications and drawings, the Chinese can probably mass-manufacture and export Rustum to Pakistan before we IOC it ...

Raman

indranilroy, Velocity increases are usually performed at periapsis (perigee in our context) because a given quantity of fuel provides a given quantity of thrust, which increases the velocity by a fixed amount. However, kinetic energy goes up by the square of velocity, so you always get more "ba...

Raman

People greatly underestimate the effort involved in upsizing or downsizing an airplane or missile - you can't just divide all physical measurements by two and have a missile that weighs half as much and has half the range. It is quite like saying, a Maruti 800 is only a little over twice the weight ...

Raman

Raman sahab, Just checking with you. I completely agree with you on the washout. My description of the effect of reflex camber on induced drag is not wrong, is it? Surely you know that I don't deserve 'sahab'! :-) As for your explanation, honestly, I didn't quite follow your post. The reflex camber...

Raman

A Question to Gurus:- Does the wing twist on LCA adds to drag? As with all things aero, the answer is: it depends. :D (I assume you are talking about span-wise wing twist (either geometric or aerodynamic) and not the reflex camber of the wing, which is something else altogether.) The twist can pote...

Raman

The "ideal landing" engages the third wire (out of four).

Raman

Mushy is at step 11 of Mullah Enqyoob-ud-din's 12-step Pakistani Dictator Lifecycle(tm)

Raman

It is extremely difficult to visually determine if the airfoil is symmetric. There was an Aero India lecture in which the scientist mentioned that the wing does not generate lift, and is therefore not used to unload the rotor at speed. The "wings" are essentially only fairings to reduce dr...

Raman

I think they are moving from a detachable chute cover to one that is hinged to the airframe. People therefore won't have to search for it after the chute deploys and detaches, and therefore it doesn't have to be in highviz dayglo colors any more. Back to boring old Tipnis grey.

Raman

A question for those in the know of the LCH program - was the skid option ever evaluated? The Army & Airforce Dhruv use skids. 1. Skids typically weigh lighter than landing gear. I was given to understand LCH prototypes does require weight reduction. Dhruv dollies could be used for ground handl...

Raman

:D Eureka - I found it! Our controversial friend Prof Prodyut Das has a great article in Vayu, but more to the point here is his comment on the AMCA model at Aero India :rotfl: http://idrw.org/?p=18444 For the AMCA display model to have been built it must have gone up several layers of “top” manage...

Raman

As Mr Spock says, it doesn't compute ! The way to compare is for wings with same wing area ! Once you fix that, it is simplicity itself to see that , for a given wing area , a wing with a high span has higher A*s Pecked ratio than one with a lower one from basic geometry. No sir - you are mistaken....

Raman

Diamond shaped wings will increase the - As* Pecked ..oops Aspect Ratio , which in turn will increase aerodynamic efficiency by increasing Lift to Drag (lower induced drag than over a lower aspect wing), giving higher range ityadi. Ask Unkal Googal about Breguet Range Equation for example. Au contr...

Raman

atreya wrote:
rahuldevnath wrote:As we speak the D-Day pictures are arriving. Some nice shots from Kapil Sir!
Any more info about that 'Official Suckers' patch? What is that about? Didn't understand '1000T+ Offtake' either!

Sukhoi pilot who has accepted more than 1000 tonnes of fuel in aerial tanking

Raman

Does the IA getting organic air-power mean that it no longer needs the IAF for CAS, and that IAF can just concentrate on BAI? Similarly, my take on the Garuds is that the IAF is looking to its own for FAC and covert lasing/destruction of enemy air defence, rather than depend on army: their training ...

Raman

And seeing both the PAF and PLAAF likely to be equipped with this new type in another 10 years or so will give the IAF the necessary impetus and motivation to put all their backing into the AMCA project. That would be nice, but if Pakis get this airplane, the pessimist in me can see an upcoming FMS...

Raman

The audit accessed by CNN-IBN reveals that financial sanctions are being split so that they don't have to go to higher authorities. In other words, they were doing what ever they could to avoid getting stuck in stupid bureaucratic bullshit. I bet the "laid down procedures" require signatu...

Raman

It has nothing to do with political correctness or American security fora - it is a matter of basic human decency that you do not refer to a people in racial terms that they find extremely offensive, and digs into very deep scars in their history. I don't recommend that you refer to Arabs as sand-ni...

Raman

Tejas FOC slides to 2015

Raman

The aircraft are lashed fast to the deck with chains. You can see them in the above picture as well -- see the nose gear of 502 in the foreground.

Raman

Kartik, aerodynamically what is the diff between launching a BVR missile and that of a dumb-bomb/external store? I can understand the rail launch related aerodynamic launch-complexities of a WVR missile but what is it for a R-77/Derby/AMRAAM etc kind of BVR missiles. There are three ways of launchi...

Raman

Have these pics been posted? From Livefist

Last picture shows her operating "курить сигнал" datalink.

Raman

Dileep,

May I also suggest that you edit the top post and append your story parts to the same post? That way, the comments don't distract from the flow of the story when reading multiple parts together. Keep up the great work!

Raman

You want the IAF to build indigenous industry ....This is backwards logic, customer goes to producer saying this is what we need, that too when producer has zilch experience to back them. .... Should be the other way, producer goes to customer saying, "hey this is what we can do for you, and h...

Raman

Some issues that might arise - hydraulic + mechanical issues: there are many moving parts - gear/door operation with aerodynamic loads imposed on gear and doors - change in aerodynamics (and hence impact on flight control laws) especially during extension/retraction transitions - pilot workload: the...

Raman

IIRC, the Aero India 2011 model of Tejas Mk2 also showed it as a bump. Looks like this is a modification, not a temporary cover.

Raman

IIRC, even the Gnat used the MLG doors as airbrakes. I always thought it was a very clever idea and wonder why more aircraft don't use this technique - probably saves weight as well.

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