Search found 746 matches

by neerajb
26 May 2020 01:06
Forum: Technology & Economic Forum
Topic: Civil Aviation Development & Discussion
Replies: 5789
Views: 622971

Re: Civil Aviation Development & Discussion

https://youtu.be/bM9ZrliDkNA Looks like plane was high during approach and touched down 4500 feet down the runway instead of usual 1500. Whether landing gear malfunctioned or pilot forgot to deploy it is unclear. Multiple chimes heard during approach for first landing indicating some problem. After ...
by neerajb
23 Apr 2020 10:30
Forum: Military Issues & History Forum
Topic: Su-30MKI: News and Discussion - August 9, 2014
Replies: 3818
Views: 738823

Re: Su-30MKI: News and Discussion - August 9, 2014

Rakesh wrote:F-22 air intake. The fit and finish of the F-22 (and yes the picture below is likely a production version) is far ahead of the Su-57.


That apparent fit finish is a thick layer of makeup only. This is how a raptor looks like in squadron service.

https://youtu.be/8FQt0mR2ykQ

Cheers....
by neerajb
22 Apr 2020 13:40
Forum: Military Issues & History Forum
Topic: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019
Replies: 924
Views: 281047

Re: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019

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...
by neerajb
13 Apr 2020 22:03
Forum: Military Issues & History Forum
Topic: Newbie Corner & Military Miscellaneous - Aug 2016
Replies: 177
Views: 51325

Re: Newbie Corner & Military Miscellaneous - Aug 2016

Yes. I saw it in a bollywood song and was scratching my head for weeks. The hump, fuselage and wings were distinctly 747 but those podded twin engines didn't make any sense. Finally I searched for odd 747 variant and got the following.

https://en.m.wikipedia.org/wiki/Boeing_747_G-BDXJ
by neerajb
26 Mar 2020 18:06
Forum: Strategic Issues & International Relations Forum
Topic: Wuhan Coronavirus Resource Thread
Replies: 7683
Views: 830928

Re: Wuhan Coronavirus Resource Thread

Sirs, I have no data but there was a sudden death in our locality. All symptoms and past history medical/travel is suggestive of what was the reason. Local doctor and the one who declared the demise is saying the same thing. Government contacted, not a word on it and certainly the number didn't bump...
by neerajb
26 Mar 2020 17:07
Forum: Strategic Issues & International Relations Forum
Topic: Wuhan Coronavirus Resource Thread
Replies: 7683
Views: 830928

Re: Wuhan Coronavirus Resource Thread

I am no expert but a recent event nearby makes me think that: 1. The numbers being reported do not reflect reality. Not fudging the numbers but general callousness of government apparatus towards public in general is causing the low confirmed numbers. 2. Few prospective cases are being tested likely...
by neerajb
24 Mar 2020 12:19
Forum: Military Issues & History Forum
Topic: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019
Replies: 924
Views: 281047

Re: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019

The traditional autoland in commercial airlines is ILS only and this capability is there since long, nothing new there. So I believe Dileep is referring to AI computer vision guiding the plane with ILS aiding it or the other way round. Again like a human pilot monitoring the ILS landing, ready to ta...
by neerajb
23 Mar 2020 16:11
Forum: Military Issues & History Forum
Topic: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019
Replies: 924
Views: 281047

Re: Tejas Mk2 Medium Weight Fighter: News & Discussion - 23 February 2019

Artificial intelligence is like trying to guess/predict vs exact measurement (with sensors and a program). Traditionally, humans code software for all possible scenarios that one could encounter for a specified task like, say, auto landing/takeoff which is complex, testing intensive and error prone....
by neerajb
11 Feb 2020 18:30
Forum: Strategic Issues & International Relations Forum
Topic: 2020 Strategic and Political Analysis-1
Replies: 8041
Views: 1067100

Re: 2020 Strategic and Political Analysis-1

IMHO delhites are better off financially than rest of India comparatively. I have seen many in my circle appreciative of freebies even when they dont need it. Many are crorepati types. Greed and selfishness has no ends it seems.
by neerajb
11 Feb 2020 00:40
Forum: Technology & Economic Forum
Topic: Civil Aviation Development & Discussion
Replies: 5789
Views: 622971

Re: Civil Aviation Development & Discussion

Just guessing here. Maybe the pilots are using higher flex temp than needed or using TOGA during hot and high to have more buffer and this is what the report is alluding to. But in any case, it should not lead to failures if they are observing the operational limits.
by neerajb
01 Feb 2020 09:44
Forum: Technology & Economic Forum
Topic: Civil Aviation Development & Discussion
Replies: 5789
Views: 622971

Re: Civil Aviation Development & Discussion

What amazes me is why MCAS was designed to operate out of one aoa sensor. Max already has two sensors, all they needed was to use data from both. Secondly mcas had no min max values for stab movement. That is another blunder. Every time it triggered, it used aoa value to calculate stab movement irre...
by neerajb
31 Jan 2020 22:10
Forum: Technology & Economic Forum
Topic: Civil Aviation Development & Discussion
Replies: 5789
Views: 622971

Re: Civil Aviation Development & Discussion

IMO MCAS is all about money and not safely or stall avoidance. Mcas doesn't work with flaps extended so any use cases involving landing and takeoff are ruled out. Mcas was created to allow max to grandfather the certification from 737 NG. Boeing told regulators that max is an iteration over the earl...
by neerajb
30 Jan 2020 10:22
Forum: Technology & Economic Forum
Topic: Civil Aviation Development & Discussion
Replies: 5789
Views: 622971

Re: Civil Aviation Development & Discussion

IMO, the huge engines were moved forward and upward to accommodate them under wing. MLG was also modified to increase ground clearance without impacting the wheel well size. This caused a pitchup tendency during high AOA and thrust situations ONLY due to engine nacelle generating extra lift which wa...
by neerajb
23 Dec 2019 14:09
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

the Tigor EV comes with a piddly 40hp engine and costs 12 odd lakh rupees. The torque curve of electric motors is pretty flat and quite independent of RPM unlike an ICE. EV's drivability is super smooth and almost linear unlike an ICE and is great in an urban environment. The 100 bhp ICE would be g...
by neerajb
23 Dec 2019 13:47
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

With 300+ range it should be ok for commuting to work and local usage. Any idea as to price? That's what Tata claims. It has 30.2 KWHr battery. In actual conditions of a full load of 4-5 passengers, cargo , and with AC on, range will be reduced by half. Some 17 lakhs is quite expensive. Not exactly...
by neerajb
08 Oct 2019 23:08
Forum: Military Issues & History Forum
Topic: VayuSena Rafale: News and Discussions - 17 Oct 2016
Replies: 3672
Views: 689563

Re: VayuSena Rafale: News and Discussions - 17 Oct 2016

neerajb...i am arguing that AWACS and even 1950's radars can place self a/c withing visual range of enemy a/c. the imaginary box u mention is much bigger than visual ranges. seems Meteors and amraams D have this datalinking capability. i need to meet Hansel v soon !!! I saw a documentary on Su-15 F...
by neerajb
08 Oct 2019 20:46
Forum: Military Issues & History Forum
Topic: VayuSena Rafale: News and Discussions - 17 Oct 2016
Replies: 3672
Views: 689563

Re: VayuSena Rafale: News and Discussions - 17 Oct 2016

An imaginary box can be calculated around the target based on range and angular resolution of Phalcon at the max desired/practical range of BVR engagement. If the missile has the capability to fly that far, receive updates via data link at that distance and then resolve the error in position using o...
by neerajb
20 Sep 2019 09:43
Forum: Military Issues & History Forum
Topic: HTT-40 Basic Trainer Aircraft: News & Discussions - 08 September 2019
Replies: 259
Views: 54418

Re: HTT-40 Basic Trainer Aircraft: News & Discussions - 08 September 2019

A few days ago, the aircraft successfully completed the six-turn spin (towards the right), recovering from an uncontrolled flight using conventional methods. “The next stage of trials will be critical as it involves testing the HTT-40’s spin behavior in the left direction, which is far more complic...
by neerajb
16 Sep 2019 23:47
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2274
Views: 335519

Re: Chandrayan-2 Mission

Too much importance being given to Python which I believe is just another programming language and a relatively lousy one. All the ML/DL that it is being credited with is actually the handiwork of frameworks like Tensorflow which happens to have a C++ core and expose the Python APIs so that not so t...
by neerajb
16 Sep 2019 09:59
Forum: Military Issues & History Forum
Topic: Chandrayan-2 Mission
Replies: 2274
Views: 335519

Re: Chandrayan-2 Mission

twitter Is that Github link pointing to snippets of source code of software that runs/controls CY2? It was coded in Python? Wow, just wow! :eek: It is simply reading data from some raw files and generating the plots. Python is being used here for visualization and not to control CY2. If you are loo...
by neerajb
17 Apr 2019 16:50
Forum: Technology & Economic Forum
Topic: Civil Aviation Development & Discussion
Replies: 5789
Views: 622971

Re: Civil Aviation Development & Discussion

It is my understanding that they are statically stable. There is no need or benefit to go otherwise. Remember that stabilizing under software control is energy inefficient. The constantly moving control surfaces cause extra drag etc. Even the MAX should be stable normally, but go tits up and stall ...
by neerajb
06 Oct 2018 12:53
Forum: Technology & Economic Forum
Topic: Indian investments thread
Replies: 432
Views: 37219

Re: Indian investments thread

Guru log, what's your take on Tata motors for long term i.e. 5-10 years horizon? It has hit 52 week low twice and DVR is trading at 120 levels now. With their current/upcoming product lineup, I don't see any hindrance in Tata motors gaining the top spot.
by neerajb
15 Feb 2018 10:18
Forum: Military Issues & History Forum
Topic: China Military Watch - Sept' 2016
Replies: 4511
Views: 1030800

Re: China Military Watch - Sept' 2016

Singhaji, high bypass turbofans efficiency stems from the way they generate thrust and their operating envelope. In commercial high bypass engines, 80% of thrust is generated by fan. They have more stages in LP turbines than military leaky turbojets (which nowdays have single stage for both LP and H...
by neerajb
03 Nov 2017 10:03
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

Nexon SUV & Tiago hatchback help Tata Motors beat Honda in India Tata Motors has beaten Honda yet again. Tata sold 16,475 cars in October 2017 while Honda could sell only 14,234 cars in the same period. The Nexon compact SUV and the Tiago hatchback are propelling Tata ahead. This is the second ...
by neerajb
27 Oct 2017 07:12
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

I agree. Recently went with a friend for test driving Baleno and Tigor. While holding the hood and doors, He remarked that they are much flimsier in Baleno and felt heavy in Tigor. But honestly if the chassis is strong, thin panels (to save weight) should not be a problem. Even the newer nexon is ba...
by neerajb
26 Oct 2017 23:30
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

If you ask me, the recurring issue with TATA is weight. There cars are heavy as compared to competition. For example Zest is 1135 Kgs, Dzire weighs 895 Kgs, Amaze 940 Kgs. This weight means low fuel economy though not by much. Zest Vs Dzire fuel economy differs by 1/2 Kmpl in city. But this weight a...
by neerajb
23 Oct 2017 12:22
Forum: Trash Can Archive
Topic: LCA: News & Discussions: 15 August 2017
Replies: 3500
Views: 675908

Re: LCA: News & Discussions: 15 August 2017

They are not modifying the airframe in any way. It has been frozen for Mk1. They are only clearing test points. One of the test points relate to a feature which was seen on early wind tunnel models but not in real flight testing. This led to somebody proposing that the said feature was never implem...
by neerajb
09 Oct 2017 09:38
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

Neither EV nor ICE are meant for water fording. Regarding normal mansoon operations, we have erikshas merrily operating 24X7/365 days without any problems. Also ICE vehicles fording capability is overrated (not talking about SUVs but normal city cars). Air intake is at grill level, 2-3 feet above gr...
by neerajb
06 Oct 2017 10:00
Forum: Military Issues & History Forum
Topic: Su-30MKI: News and Discussion - August 9, 2014
Replies: 3818
Views: 738823

Re: Su-30: News and Discussion - August 9, 2014

As pointed out by JayS, afterburner does not put that much stress on engine as the core combustion does on combustor, diffuser/turbine nozzle/stator and turbines. Temperatures in both core and AB are high but pressure is relatively lower in AB and all fuel added goes towards increasing the exit velo...
by neerajb
18 Sep 2017 13:22
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

Currently the only electric cars available in India are Mahindra e2o plus and Mahindra E Verito. Both have claimed ranges of more than 100 KM per charge. e2o comes in two versions with 110 and 140 Km per charge range. Tata is launching electric versions of Tiago and Nano, both with around 100 Km ran...
by neerajb
16 Sep 2017 11:35
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

Even many small cars have auto engine off and restart for tradfic stops these days like nissan micra A good plan needs to be in place how to prevent ppl from just throwing ev batts into the nearest garbage dump knowing our law abiding junta esp bus and taxi drivers. Make it 1:1 mustto hand in old p...
by neerajb
13 Sep 2017 09:05
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

I don't know how many amps does a typical indian house is wired for though. This would depend on the electric panel and connection to power company. In Delhi, BSES sanctioned load for domestic consumption starts from 1.3 KW and goes all the way till 10KW. They increase the sanctioned load (and secu...
by neerajb
12 Sep 2017 22:25
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

https://www.team-bhp.com/news/scoop-tat ... coimbatore

Scoop! Tata Nano electric spotted testing in Coimbatore
by neerajb
11 Sep 2017 09:52
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

http://www.financialexpress.com/auto/ca ... on/849093/

Tata Tiago EV: Tata’s first electric car with 100 km range showcased, to launch in India soon
by neerajb
04 Aug 2017 12:36
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

Tata needs a hit badly...Tiago/Tigor generated a lot of hype during launch but did not strike well with consumers. Mainly, the reason was underpowered engines and subpar cabin refinements. Apparently, both of these have addressed in the Nexon... Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun 2016 ...
by neerajb
19 Jun 2016 20:52
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

Saar I am not saying Tata is king of the hill. My only contention is credit should be given where it is due. Tata is responsible for the poor brand image no two ways about it but it has improved by leaps and bounds in terms of quality of products. In fact their cars are as contemporary as others and...
by neerajb
19 Jun 2016 19:46
Forum: Technology & Economic Forum
Topic: Indian Autos Thread -2
Replies: 594
Views: 109077

Re: Indian Autos Thread -2

By generalization I was referring to "cheap plastics" comment. I don't see it in my car + other tata cars that I see, so definitely a generalization for me. Yes if you are referring to Indiacas of yore than you are right. Again you are wrong when you say Tata banks on feature less cheap ca...

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