Search found 926 matches

by Zynda
09 Feb 2018 21:58
Forum: Military Issues & History Forum
Topic: Pakistan Armed Forces: News & Discussion Thread
Replies: 400
Views: 100543

Re: Pakistan Armed Forces: News & Discussion Thread

T129 is like Su-30MKI. I believe some of the avionics are Turkish in origin even though the airframe, propulsion & stuff is from Italy. Also some of the armaments the T129 carries (or in future) are also Turkish. I think Turkey have (in-service or ongoing design) of an anti-tank missile suitable...
by Zynda
07 Feb 2018 17:56
Forum: Military Issues & History Forum
Topic: Transport Aircraft for IAF
Replies: 3631
Views: 264193

Re: Transport Aircraft for IAF

I would first start by asking Airbus to create a separate variant for India called C-295I. I am sure there will be many suggestions for product improvements, modifications after usage by Indian Armed Forces. The work required for these improvements, modifications has to be carried out in India...at ...
by Zynda
05 Feb 2018 21:29
Forum: Military Issues & History Forum
Topic: Indian Military Aviation - 21 Sept 2015
Replies: 4274
Views: 389752

Re: Indian Military Aviation - 21 Sept 2015

https://forums.bharat-rakshak.com/viewtopic.php?f=2&t=7365&p=2249404#p2249404 Totally OT...but posting here so that it can get a little bit more eyeballs. Hoping that Deejar saar with his practical experience could answer this or individuals like IR & JayS who have better aerodynamics kn...
by Zynda
05 Feb 2018 21:28
Forum: Technology & Economic Forum
Topic: Aerospace Engineering - Aerodynamics, Structures, Avionics, Flight Dynamics - Technical Discussions
Replies: 67
Views: 8708

Re: Aerospace Engineering - Aerodynamics, Structures, Avionics, Flight Dynamics - Technical Discussions

I have a question about practical interpretation of Angle of Attack (AoA) of an aircraft. If I refer to any aerodynamics book, AoA is defined as the angle between the chord line of the airfoil (Wing) section and the relative wind flow direction as shown below. http://code7700.com/images/airfoil_term...
by Zynda
04 Feb 2018 22:30
Forum: Military Issues & History Forum
Topic: Russian Weapons & Military Technology
Replies: 1483
Views: 194769

Re: Russian weapons and military technology

^^Beautiful bird...truly a reflection of its nickname "White Swan".
by Zynda
04 Feb 2018 18:46
Forum: Military Issues & History Forum
Topic: Transport Aircraft for IAF
Replies: 3631
Views: 264193

Re: Transport Aircraft for IAF

Chola saar...to late on the An-32. Saudis have already poured moolah in to that aircraft modernization and Antonov has come up with An-132D. Perhaps Saudis get a share of pie from export orders? https://upload.wikimedia.org/wikipedia/commons/2/21/Antonov_An-132D_roll_out.jpg https://upload.wikimedia...
by Zynda
04 Feb 2018 18:42
Forum: Military Issues & History Forum
Topic: International Military Discussion
Replies: 2908
Views: 292815

Re: International Military Discussion

A major milestone in the #CR929 program as manufacturing tests of full-scale 15 x 6 meter composite fuselage panels were successfully completed, with follow-up tests showing good results. These composite components will enable the CR929 to reduce weight and increase efficiency. https://pbs.twimg.co...
by Zynda
04 Feb 2018 18:11
Forum: Military Issues & History Forum
Topic: VayuSena Rafale: News and Discussions - 17 Oct 2016
Replies: 1581
Views: 227188

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

Found this document on Keypubs; An article about Rafale including current F3R & upcoming F4 standard. fox3_19.pdf Posting excerpts about F4... The Standard F4 will include a whole new generation of sensors and weapons helping boost the fighter’s already fearsome air-to-air and air-to-surface cap...
by Zynda
04 Feb 2018 01:01
Forum: Trash Can Archive
Topic: LCA: News & Discussions: 15 August 2017
Replies: 3500
Views: 512323

Re: LCA: News & Discussions: 15 August 2017

http://www.thehindu.com/news/national/article22645882.ece/alternates/FREE_660/USAF%20Chief01-1 Firstly, either ADA or MoD, why can't they make that scale model of Tejas, which is being handed over to US Air Force Chief, available to general public? I would pay decent money to own a scale model and ...
by Zynda
03 Feb 2018 20:33
Forum: Technology & Economic Forum
Topic: Aerospace Engineering - Aerodynamics, Structures, Avionics, Flight Dynamics - Technical Discussions
Replies: 67
Views: 8708

Re: Aerospace Engineering - Aerodynamics, Structures, Avionics, Flight Dynamics - Technical Discussions

For people interested in Pure Aerodynamics and connecting the mathematics of it to physical form, I guess this book would be helpful. Understanding Aerodynamics: Arguing from the Real Physics: Doug McLean Personally, I found this book a little heavy on Maths, which should be expected since Fluid flo...
by Zynda
31 Jan 2018 17:45
Forum: Military Issues & History Forum
Topic: Indian Missiles News & Discussions - May 2017
Replies: 5098
Views: 972329

Re: Indian Missiles News and Discussions - May 2017

Have to agree with Haridas on the wt. savings part. The realistic wt. savings from metallic to composite conversion is around 15-20% (at least in aerospace applications). For parts/structures which do not have details could see up to 35-40% of weight savings but most parts/structures IRL do have det...
by Zynda
31 Jan 2018 15:11
Forum: Military Issues & History Forum
Topic: Indian Military Aviation - 21 Sept 2015
Replies: 4274
Views: 389752

Re: Indian Military Aviation - 21 Sept 2015

GoI wants C295 to be part of MII. I think Tata was chosen to be the preferred partner for assembly but Airbus (& Tata) are insisting that 56 would be not economical...they want GoI to push up the orders to at least around 100 or so...I guess the deal is stuck in limbo.
by Zynda
29 Jan 2018 20:05
Forum: Technology & Economic Forum
Topic: Indian Railways Thread (Dec 2015)
Replies: 2921
Views: 357459

Re: Indian Railways Thread (Dec 2015)

Arshyam good points on OHE limitations and also thanks on that crucial point of twin WAP5 arrangement on Raj. Jay, I think ICF is modifying existing LHB coach design to adapt for EMU kind of arrangement & LHBs have 8 wheels per coach design. Hopefully ICF design capabilities have improved but I ...
by Zynda
29 Jan 2018 18:25
Forum: Technology & Economic Forum
Topic: Indian Railways Thread (Dec 2015)
Replies: 2921
Views: 357459

Re: Indian Railways Thread (Dec 2015)

UK has gone with the high-speed EMU/DMU solution on their rail network. I think only freight trains on UK rail have a dedicated loco. On mainland Europe, dedicated loco hauled passenger trains still seem to be plying. Could be a good idea to replace Shatabdi Express or day trains with such solutions...
by Zynda
26 Jan 2018 20:49
Forum: Trash Can Archive
Topic: Republic Day 2018
Replies: 36
Views: 5125

Re: Republic Day 2018

Folks any pictures of SPG personnel who are not in the vicinity of PM this year? We used to get pictures of them from recent Republic Parades like these:

Image

I searched but was not able to find pics from this year's parade.
by Zynda
25 Jan 2018 16:57
Forum: Military Issues & History Forum
Topic: India's R&D in Defence DRDO, PSUs and Private Sector
Replies: 3393
Views: 335991

Re: India's R&D in Defence DRDO, PSUs and Private Sector

^^Link still is pointing to a document in Hindi.
by Zynda
25 Jan 2018 16:55
Forum: Military Issues & History Forum
Topic: Army strikes terror camps in PoK
Replies: 2047
Views: 224927

Re: Army strikes terror camps in PoK

The documentary was nice but obviously a lot of details got left out. Anyways, got a few noob questions. I understand the scenes in documentary were dramatised and may not reflect actual practices but the Para Recon team when they were behind enemy lines, I saw them not using suppressors on their ri...
by Zynda
25 Jan 2018 13:23
Forum: Trash Can Archive
Topic: LCA: News & Discussions: 15 August 2017
Replies: 3500
Views: 512323

Re: LCA: News & Discussions: 15 August 2017

I would say that if anyone is looking to get introduced to aerodynamics without going through maths, "Flight without Formulae" by A.C Kermode is good too. In fact, one of my mentors always suggests to go through literature which does not have any maths initially & get a decent understa...
by Zynda
24 Jan 2018 22:20
Forum: Technology & Economic Forum
Topic: Civil Aviation Development & Discussion
Replies: 4735
Views: 352115

Re: Civil Aviation Development & Discussion

Thx Jay.

One more beautiful shot of the plane landing back from its sortie...courtesy of Tamrak007.

Image
by Zynda
24 Jan 2018 18:58
Forum: Trash Can Archive
Topic: LCA: News & Discussions: 15 August 2017
Replies: 3500
Views: 512323

Re: LCA: News & Discussions: 15 August 2017

Somebody here were inquiring or had posted recommendations (along with JayS) about Introduction of Flight by John Anderson Jr. Would like to say that book is very good and a delight to read. Basics are treated very well with good correlation to real physics. Liked the way he tends to explain...very ...
by Zynda
24 Jan 2018 18:49
Forum: Technology & Economic Forum
Topic: Civil Aviation Development & Discussion
Replies: 4735
Views: 352115

Re: Civil Aviation Development & Discussion

Also whats the V-shaped structures below the vertical tail? I don't think they are any sort of control surfaces...may be some kind of rear canard like thingy? Those were there on the original Saras as well...never noticed them till now!
by Zynda
24 Jan 2018 18:45
Forum: Technology & Economic Forum
Topic: Civil Aviation Development & Discussion
Replies: 4735
Views: 352115

Re: Civil Aviation Development & Discussion

More from Dr. Harsh Vardhan's twitter feed... I congratulate CSIR-National Aerospace Lab scientists on the maiden flight of 14 seater SARAS PT1N. Designed & developed by CSIR-NAL, it flew for about 30 minutes this morning at a maximum height of 8500 ft at a speed of 145 knots. All the system par...
by Zynda
24 Jan 2018 18:44
Forum: Technology & Economic Forum
Topic: Civil Aviation Development & Discussion
Replies: 4735
Views: 352115

Re: Civil Aviation Development & Discussion

Here is a pic of the same from Ananthakrishna's Twitter feed.

Image

Whats the grid of raised dots on the tail + rudder? Doesn't seem like strain gauges but it could be!
by Zynda
23 Jan 2018 14:57
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 3703
Views: 497634

Re: Indian Military Helicopters

[quote="Jayram"] Per my calculations, the beam was already oversized. Granted, I did a check just on the beam and joints and not the welds. Plus adding stuff to a rectangular beam would be easier from design & fabrication cost & effort. The only thing I would have done differently ...
by Zynda
21 Jan 2018 18:20
Forum: Trash Can Archive
Topic: Indian Navy News & Discussion - 15 Dec 2016
Replies: 4822
Views: 759349

Re: Indian Navy News & Discussion - 15 Dec 2016

I wouldn’t want another from the Vikrant class to be perfectly honest. Not unless we can get a western designer for the aviation complex to replace the Russian one. But in the end, the IN’s vision is for a 65-K ton CATOBAR carrier with Western carrier aircraft. It is hoping to take advantage of col...
by Zynda
20 Jan 2018 19:35
Forum: Strategic Issues & International Relations Forum
Topic: Out-of-India - From Theory to Truth: Part 2
Replies: 5064
Views: 317725

Re: Out-of-India - From Theory to Truth: Part 2

Shiv,
Any chance of uploading the videos from the recent Chennai Indology Summit? Rajiv Malhotra has uploaded a critique of Harvard Tamil chair which has excerpts.
by Zynda
18 Jan 2018 22:31
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 3703
Views: 497634

Re: Indian Military Helicopters

^^I meant weld line already provides one load path...why have another fastener load path. Hi Loks are used instead of rivets rather than bolts because hi loks are permanent fasteners. Usually hi-loks are for high strength applications and they provide better fatigue resistance than normal rivets. Al...
by Zynda
18 Jan 2018 22:14
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 3703
Views: 497634

Re: Indian Military Helicopters

Jay, I meant COTS extrusions...easily available in different standard sizes & shapes.
by Zynda
18 Jan 2018 20:47
Forum: Military Issues & History Forum
Topic: China Military Watch - Sept' 2016
Replies: 3246
Views: 531202

Re: China Military Watch - Sept' 2016

^^They could be Chinese origin naturalized engineers. I don't think American born Chinese origin folks would be too keen on working in China. It is almost next to impossible for a foreign national to get employed in the above orgs due to ITAR & TSC clearance requirements.
by Zynda
18 Jan 2018 20:24
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 3703
Views: 497634

Re: Indian Military Helicopters

^^Yes...current practice in commercial aerospace at least (largely same philosophy is followed in Mil Aviaton as well but USAF/USN follow a slow growth analysis approach which is not acceptable by FAR/EASA agencies) is to assume that a small crack exists right from time the component is installed on...
by Zynda
18 Jan 2018 20:10
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 3703
Views: 497634

Re: Indian Military Helicopters

^^ Thx Sir. What could be the realistic total weight carried by solider during operations? 100 Kg max? SF may be an exception as you say. But dropping in SF folks packing 35+ Kgs becomes the norm (total weight 70 + 35 = 105...keep 110 Kg) then IAF/IA personnels should provide that weight to HAL on f...
by Zynda
18 Jan 2018 19:44
Forum: Technology & Economic Forum
Topic: Indian Railways Thread (Dec 2015)
Replies: 2921
Views: 357459

Re: Indian Railways Thread (Dec 2015)

Recently Bombardier Transportation made a sales pitch to IR about its TRAXX 3 electric locomotives. Bombardier are offering up to 12875 HP passenger & freight locomotives to IR. Bombardier claims that a single TRAXX 3 pax loco can haul 24 LHB coaches at 200 Kph on a straight level track. Here is...
by Zynda
18 Jan 2018 19:37
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 3703
Views: 497634

Re: Indian Military Helicopters

JayS, I dunno how expensive a casting manf process would be...as Ramana pointed out, the inner surface is primed with chromate conversion coating to give a degree of protection from corrosion. Would be easy to apply on the inner wall surface of the tube if it was a separate component. I am sure it c...
by Zynda
18 Jan 2018 18:17
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 3703
Views: 497634

Re: Indian Military Helicopters

I made a small error with respect to joint margins. Had considered the wrong load and up on review, the margin now is at a revised figure of 42%. Anyways here is the picture with probable crack start locations. http://i1053.photobucket.com/albums/s480/usgesd90/DTPDfkTU0AEk4Qi.jpg%20large_zpswgotjq3n...
by Zynda
18 Jan 2018 13:15
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 3703
Views: 497634

Re: Indian Military Helicopters

I would want to point out that the following "analysis" is based on a lot of assumptions which will render it highly approximate. IMO, the boom is fabricated using Aluminum 2024-T3 Extrusion and not cast. 1. Cast material is usually more brittle in nature and is bad from a fatigue POV. Sin...
by Zynda
12 Jan 2018 14:32
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 3703
Views: 497634

Re: Indian Military Helicopters

The failure is quite probably fatigue induced. Marks are clear. I will try to post a pic highlighting striation marks along with locations where crack initiation happened when I get some time.
by Zynda
11 Jan 2018 22:37
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 3703
Views: 497634

Re: Indian Military Helicopters

I can't make out head or tail about the boom config from the above picture. Is there a picture of the intact boom showing its location on the helicopter? What does the boom carry or support? I have not looked at the video because I don't want to see the unfortunate incident. I found these two pictur...
by Zynda
11 Jan 2018 14:50
Forum: Military Issues & History Forum
Topic: Indian Military Helicopters
Replies: 3703
Views: 497634

Re: Indian Military Helicopters

Why don't you calculate it Chola sir? Assume a rectangular cross section of 10 in x 10 in. And a length of 36 inches. So the volume is 10 x 10 x 36 = 3600 in^3. Consider a hollow section of the above with wall thickness of 1 in. Area of the C/S = (10 x 10) - (8 x 8 ) = 100-64 = 36 sq. in. And the vo...
by Zynda
11 Jan 2018 00:53
Forum: Trash Can Archive
Topic: Indian Navy News & Discussion - 15 Dec 2016
Replies: 4822
Views: 759349

Re: Indian Navy News & Discussion - 15 Dec 2016

how many of our young naval architects from IIT kgp head for naval architecture and how many to the nearest IIM or US consulate ? :twisted: Naval architects probably have to jump to IT once they land in US and wait in GC line for ever :twisted: . I doubt jobs in Naval engineering would be easy to f...
by Zynda
11 Jan 2018 00:44
Forum: Military Issues & History Forum
Topic: International Aerospace Discussion - Jan 2018
Replies: 625
Views: 77196

Re: International Aerospace Discussion - Jan 2018

^^Holy moly. 7 aircraft per month. I am aware post-WW2, if any combat aircraft has been manufactured at that rate...simply amazing. Gotta hand it to US MIC. More comments about F-35... It is not just stealth that makes the F-35 great. It is the F-35's ability to ensure true connectivity within the b...

Go to advanced search