Bharat Rakshak

JayS

It's not hope but a need. Soon quite a few of even SU 30MKIs will reach 30 years. So replacing them will be expensive to spend on light fighters. So buying more Tejas will conserve funds for more expensive planes. The Su30MKI do not need any replacement anytime soon. All they need is a good upgrade...

JayS

I'll just leave this here for reference https://twitter.com/realkaypius/status/1267139866900393984 For the Nth time, auto blade folding was NEVER incl, either in 1985 ALH specs or the latest NUH NSQRs. Of all heptrs Indian Navy ever held, only Seaking variants have auto blade folding. Kamovs & A...

JayS

HAL OFFERS NEW SOLUTION FOR NAVAL ALH BLADE FOLDING.

https://kaypius.com/2020/05/28/hal-offe ... e-folding/

JayS

Is there any video of the event where the CDS said this..???

JayS

Well the formation of Sq 45 with 2 jets was also a less than ideal situation. IIRC even then the plan was to raise the Sq with 4 jets. Though since Sq 45 is already there to handhold the new Sq a bit initially, current situation is not all that dire. Plus they will be colocated with the Sq 45.

JayS

Kartik, what we see in papers is just a tip of the iceberg. Smallest changes may need a lot of flight testing efforts still. I am sure the PM team of LCA would have 100s of items on the To Do list. I think the priority is to get the FOC version sorted completely, backport key changes to IOC like BVR...

JayS

Plan was to form the Sq with 4 jets. 2 is too few I think. But may be Sq 45 could loan a couple of theirs if things need to be expedited. IAF will decide on this one I suppose.

Yesterday, 14th May, was 77th Birthday of Dr Kota Harinarayana, the Father of LCA. FYI.

JayS

Kartik there is a paper published on Typhoon's AAMK - https://arc.aiaa.org/doi/abs/10.2514/1.C034473 It has roll issue at high AoA predominantly. The wings stall at lower AoA. The LERX helps stabilize the LE vortices at high AoA and side slip. LCA does not have problem with wing AoA, it goes on till...

JayS

Please move the engine related discussion to Kaveri/Engines thread.

JayS

Difficult to say how much without specific configuration. For fighter it may and for civilian jets i may not. Also depends on Tail vs canard vs tailless config. But in general for fighters, FBW allows you to have relaxed static stability which allows you to trim, for same condition, at lower AoA an...

JayS

To the best of my knowledge there will be no significant increase in the dry thrust of the EPE which itself is not funded right now. We had some discussion on this some time back. I remember to have seen one data point on EPE that GE managed to increase the TET with advancement in the cooling tech ...

JayS

India pays R&D for many OEMs, except Indian.

JayS

What do you define as "herd immunity"? My understanding is that it is defined as a large enough pool of infected but recovered people, that the disease finds it difficult to find uninfected people to spread to. So if they are highly underestimating infection, that would be a good thing? T...

JayS

Indian kits approved by ICMR. https://i.imgur.com/eLrTZFa.png You missed a few there. No 6 & 9. Also SD Bio had two kits in CDSCO list. Not sure if the Indian subsidiary created a kit in Desh independent of the parent entity or it was just a copy of the same kit submitted under slightly differe...

JayS

Sweden on a sort of plateau with it's unorthodox response to Covid19 with no lockdown .... herd immunity hypothesis certainly holds good for the Swedes! https://www.straitstimes.com/world/europe/sweden-says-its-controversial-coronavirus-strategy-proving-effective How does Sweden's case implies herd...

JayS

We ended up with a 4 vs 24 situation Designing for 4 vs 24 is impractical IMO. LCA is a light fighter after all. We have other fighters too which can take much larger load out and longer CAP missions. We cannot rely only on CAP for stopping a large scale attack, we need to utilize ORP as well as th...

JayS

Harsh Vardhan Thakur @hvtiaf 1. Hawk's skin is paper-thin to keep weight low. Highly optimised for training role. Can't take gun fire, ricochet, shrapnel etc. 2. #Tejas is a flying tank. Totally different league. 3. Instantaneous & Sustained Turn Rates are not influenced by Max structural-G lim...

JayS

Free advice - don't get lost in the external looks of an Aircraft, if you are trying to understand how its designed. Shape comes later. First come Parameters like TWR and Wing loading. There are multiple ways of achieving same TWR and W/S combo (arrived at based on all SQR), and there is no one true...

JayS

I think the low wing-loading for LCA is result of two factors - high ITR and good hot and high performance specified. For the small size, there are little options left other than delta wing to achieve the required W/S.

JayS

Will FBW reduce drag on conventional swept wing planes? If yes, how much - marginally or substantially? Difficult to say how much without specific configuration. For fighter it may and for civilian jets i may not. Also depends on Tail vs canard vs tailless config. But in general for fighters, FBW a...

JayS

Thank Gyan for the very informative post! I have a little doubt. The advantage of FBW based longer range for the delta-winged LCA is true. However, as a design choice was it a factor? The design decision was made in early 90s (1990-91) whereas the study of F-16XL, if I am not wrong, was published i...

JayS

The lack of deliveries for AntiBody kits is worrisome. We are wasting precious lock-down time. The delivery for the 0.5M test kits (presumably import order) is taking forever. The request for quotation went on 23rd March or so IIRC. Earlier ICMR said, they should come by Wednesday, 8 April. Today, I...

JayS

https://twitter.com/ANI/status/1248563860358873090 ANI @ANI Yesterday, we conducted 16002 tests. Only 0.2% cases tested positive . On the basis of the samples collected, the infection rate is not high; Rapid diagnostics kits have also been sanctioned: Lav Agrawal, Jt Secy Ministry of Health When on...

JayS

After a long time ICMR has published tested individuals number.

JayS

ICMR has published paper on its SARI patients' survelliance testing program.

Summary in the image and link to paper here - https://t.co/VAHO1nulse?amp=1

JayS

https://www.mohfw.gov.in/pdf/3ContainmentPlanforLargeOutbreaksofCOVID19Final.pdf The govts very detailed containment plan. This is the one coupta was talking about. It seems our administration is also rising to the challenge. Rahul M, some of these documents are being released post facto i.e. the p...

JayS

So basically, a max of 4 BVRAAMs and 2 CCMs with 1 centerline drop tank is the most optimum air to air configuration for the Tejas as per most of you folks. Agreed, when you don't want to stay on station for too long, since the IAF has a major tanker shortage and air refueling will be a luxury. Rep...

JayS

One data point from today's presser is - No Anti-Body tests till now. The kits are expected to be received soon and tests to start with these kits by coming Wednesday. Saar, after 15th March we tested about 54000 samples. Current known number for TJ cluster is 22000 in contract tracing. So we have t...

JayS

Jyoti CNC from GJ created a ventilator in only 10 days, costs 1L only. They have tested it now. The company is donating 1000 ventilators to GJ Govt. I cannot find how good this Ventilator is compared to others, or details of the design - whether its present design which they simplified and localised...

JayS

I think, in addition to above protocol we need a Random sampling based surveillance test compelling on asymptomatic people, at least in the containment zones which are marked correctly, to gauge the presence of any Asymptomatic patients and the spread of the disease. It sure looks like some of the a...

JayS

shaun wrote:Testing net being expended

https://icmr.nic.in/sites/default/files ... O_Labs.pdf

JayS

We have ramped up testing from 1000 to 10,000 /day in just 2 weeks. Private sector test kits are starting to make a big difference in the test numbers. I'm not too concerned with the increased number of positive cases (it was 2.5% before testing of the TJ crowd). The tests in the last 2 days were l...

JayS

Kanika Kapoor tests negative at last. She was first reported positive for the virus on march 20 and she had symptoms for 4 days before that. It took at least 18 days for the virus to clear her system. If we add the incubation period, its probably more like 23 to 25 days. she still should be quarant...

JayS

Can't the local companies ask/apply for a travel pass and "drive" themselves to Pune for submission of the kits? Well it's NDTV so no idea if that's true. If it is, they should simply ask AI or IAF to fly them to Pune. ICMR made special arrangements from early on with a bunch of couriers ...

JayS

Carrying fuel inside the wings and fuselage is the best way to carry fuel without incurring a significant drag penalty. I don't see why one would not want to maximize that potential as far as possible. Think of it this way, if your wings are carrying more fuel inside them, you may be able to keep a...

JayS

Some exchange with HVT saar reveals that IOC jets will soon have full FOC level BVR capability back ported. That means Sq 45 can go to front line in some time with full BVR capability, giving it all required basic min capability needed for full flegded Air Defense missions. Astra is being integrated...

JayS

I feel designing CFT for a clean sheet design is akin to designing a 3-wheeler with and additional wheel when what you really wanted was a 4-wheeler always.

JayS

Indranil, I am just trying to understand the logic behind LCA design and why is it being carried over into MK2. Evidently same wing design even though considered for MCA in 1990s is not being carried over into AMCA. While China has used Canard Delta for its Stealth fighter. F-16XL was supposed to h...

JayS

First Article will always have teething problems. Thats why it doesn't make sense to constantly keep changing specs with small orders. Generically true...but how is it relevant to issues coming up for S erial P roduction ??? Was the SP lot for Mk1s a "small order" ? Your LSPs etc. are all...

JayS

Prasad wrote:Is there nobody higher up to talk to about such problems?

Things will get done when everyone's ass is on fire. until then its just - isi topi uske sar....

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