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by JayS
11 Jul 2013 11:23
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

HAL should be providing engines to mech depts of engineering colleges properly with instrumentation and SW toolkit for people to understand it better. even a modded PTAE-7 will get things moving. India is like ships in the night, a billion objects going their own random ways.... I second that. I wo...
by JayS
10 Jul 2013 16:54
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

You are coming close to my idea of old of turning a few hundred of our retd. aircraft into "kamaikaze"/UCAVs! if we want Kamikaze aircraft, instead of developing new FCS for old and retired aircraft, develop the Advanced Crew Escape and Rescue Capability (AERCAB) so pilots get to put the ...
by JayS
09 Jul 2013 16:26
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

Yes,even the new UCAV stealth designs show similarities to the manned flying wing bomber concepts,with the engine intakes replacing the cockpit hump .A UCAV version of the LCA could also be part of future development. It would be much easier to built an auto-pilot/remote-pilot for LCA now that the ...
by JayS
09 Jul 2013 12:41
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

My opinion: The small birdies are here to stay. They could be much more agile and stealthy just because they have small size and have less inertia. As technology progresses light fighters should be at more advantage than medium to heavy fighters. Big fighters will bleed too much energy even if they ...
by JayS
03 Jul 2013 09:07
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

As soon as LCA-Mark-2 rolls out we should start working on LCA Mark-3, which was rumored to be in works. Even if IAF won't need it, DRDO should go for LCA mk3 as a tech demonstrator for next gen technologies. It would be both safer and cheaper rather than making whole new AMCA TD straightaway and t...
by JayS
02 Jul 2013 16:29
Forum: Mil-Tech Archive
Topic: Indian Space Program Discussion
Replies: 3966
Views: 570936

Re: Indian Space Program Discussion

General question: In case of loss of attitude and imminent loss of control, why don't rocket designers think of saving the payload by ejecting just like a ejection seat? Is it because of weight penalty of installing the system? Surely, part of whole of the payload(s) can be salvaged and insurance c...
by JayS
01 Jul 2013 17:33
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

i think the levcon gets you higher aoa for the whole wing - but does it at lower drag since the flow remains attached Two things: 1. Can the wing reach required coeff. of Lift (Cl) at all without Levcon?? Whatever may be the drag..(L = Cl * 0.5 * rho * velocity^2. you fix max landing speed which wi...
by JayS
01 Jul 2013 16:16
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

Yes cranked arrow is definitely wrong. I typed it in a hurry. In the classical washout the AoA of the aerofoil decreases along the span. This allows the wing root to stall before the wing tip thus allowing some allowance before the whole wing stalls. This also lowers lift near the wingtips, and hen...
by JayS
30 Jun 2013 22:19
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

nileshjr, Can you point out a resource instead of giving your half gyan ? and if not here, where it had to be posted? Why is is irrelevant? You should be clear about it. Lord, we come before Thee now, At Thy feet we humbly bow; Lord, we know not how to go Till a blessing Thou bestow. Grant that all...
by JayS
30 Jun 2013 21:35
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

Just my thoughts as I am not sure of the nomenclature myself. There is a good chance that we both learn in the process. I think the cranked delta wing would be the right description of LCA. And here are my reasons. 1. The anhedral at the wingroot is not maintained along the chord. They wanted to ha...
by JayS
29 Jun 2013 23:40
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

Read Here http://www.pprune.org/archive/index.php/t-426301.html The stronger the wingtip vortices, the greater will be the increase in critical angle and the drag. Any factor that decreases wingtip vortex strength will decrease critical angle and drag. I wonder why you quote this here. Its totally ...
by JayS
29 Jun 2013 12:35
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

4. The limiting factor is the yaw control authority. The rudder gives good control authority till 24(22?) degrees. But it can be artificially stabilized till about 26 degrees (FOC objective). The rudder/tail being 'hidden' from airflow behind the plane at high AoA is why some fighters like F-18, F-...
by JayS
29 Jun 2013 12:02
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

Of course having LEVCON's on the AF version will lower the approach speed. But is it required? I don't think that the Levcons can obviate the drag chute (the levcons will lower the approach speed by about 5-15 knots). For reasons why ADA did not go for the levcons even on Mk2 is long. 1. Slower spe...
by JayS
28 Jun 2013 19:27
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

Could you please explain what exactly you mean by visibility and how "Slower speeds and better control" would aid visibility?? One thing is certain, drooping nose improves visibility in front while landing at high AoA. I am merely quoting ADA. The Nose droop dimension was added by the 're...
by JayS
28 Jun 2013 16:59
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

that really reflects badly on you ranji..Indranil has to be one of the most effective communicators on BRF. I don't believe you'll find anyone else on BRF agreeing with you. Must be. If I don't understand what he said, I don't understand. He is hypothesizing vs what ADA specifically said. Why Slowe...
by JayS
27 Jun 2013 19:21
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

Actually, downward deflections are +ve and upward positions are -ve. The upward deflection is for drag enhancement (You probably guessed it, but didn't believe it :-)) Also, your research in the working of the Levcon is going in the right direction. Please accept my compliments for doing your resea...
by JayS
27 Jun 2013 13:41
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

You are right on all accounts here, the purpose of levcons and their current settings. Also I agree that the Levcon can be used for better STR (if the need arises and the priorities allow time). They can be easily strapped on later. Indranil, could you please explain what is the use of LEVCON with ...
by JayS
27 Jun 2013 11:16
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

Thanks Nilesh, exactly I also thought that Levcons could be used as canards (ala PAK FA). The snippet you quoted hints that it might affect STR in positive way, but for that they had to do some tests. Now it could be time constraint too, because adding levcons and using them canards would have been...
by JayS
26 Jun 2013 19:15
Forum: Military Issues & History Forum
Topic: LCA News and Discussions
Replies: 4264
Views: 140655

Re: LCA News and Discussions

^^^ I am not an expert, but Will try and test my knowledge here. :) Levcon were introduced in NLCA for catering its low-speed-high-AoA STOBAR requirements. Levcon work similar to LERX (e.g. F-18). It produces a leading edge vortex over the wing at high AoA. Due to this a low-pressure zone is created...
by JayS
19 Jun 2013 17:10
Forum: Military Issues & History Forum
Topic: Newbie Corner & Military Miscellaneous
Replies: 4126
Views: 463027

Re: Newbie Corner & Military Miscellaneous

One more nube question, this time regarding the Brahmos Missile. Why is Brahmos always refered to as "World's only supersonic cruise missile"?? For ex in following news (i know its TOILET paper but still :) ) http://www.bharat-rakshak.com/NEWS/newsrf.php?newsid=20220 Surely its not the onl...
by JayS
18 Jun 2013 13:29
Forum: Military Issues & History Forum
Topic: Newbie Corner & Military Miscellaneous
Replies: 4126
Views: 463027

Re: Newbie Corner & Military Miscellaneous

LCA uses a cranked delta wing. You can read the narration for cranked wings for space shuttle http://www.century-of-flight.net/Aviation%20history/evolution%20of%20technology/Delta%20Wings.htm Hi, Thanks for the link. There is difference between "Cranked Delta Wing" and "Cranked Wing&...
by JayS
03 Jun 2013 23:33
Forum: Military Issues & History Forum
Topic: Newbie Corner & Military Miscellaneous
Replies: 4126
Views: 463027

Re: Newbie Corner & Military Miscellaneous

Hi guys, I am a newbie to BRF. I recently started following BRF in order to gain some practical knowlwdge in the field of Aviation/Aerospace and general millitary tech. I have been reading the LCA threads for some time. There is tons of posts there, some of which are really informative and technical...

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