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by PratikDas
25 Aug 2019 23:39
Forum: Military Issues & History Forum
Topic: Tejas Mk.1 & Mk.1A: News & Discussions: 23 February 2019
Replies: 1066
Views: 303245

Re: Tejas Mk.1 & Mk.1A: News & Discussions: 23 February 2019

Rs 250 crore - Rs 275 crore works out to what? USD $35 - $40 million per aircraft? Is my conversion match correct? So what changed that the price of each bird dropped by so drastically - Rs 175 Crores? Apparently HAL thought Price Gouging is not just done by the foreign suppliers, but it should too...
by PratikDas
18 Mar 2019 12:01
Forum: Trash Can Archive
Topic: Shri Manohar Parrikar condolence thread
Replies: 108
Views: 8182

Re: Shri Manohar Parrikar condolence thread

Manohar Parrikar and his wife Medha who succumbed to cancer in 2001 https://i.imgur.com/JTULXScl.jpg https://i.imgur.com/VBmOhyHl.png https://i.imgur.com/y26AkGTl.jpg https://i.imgur.com/9mf7Qi0l.jpg https://i.imgur.com/2Dw78kXl.jpg https://i.imgur.com/0lkPATkl.png https://i.imgur.com/VP6m42Vl.jpg h...
by PratikDas
05 Mar 2019 13:17
Forum: Military Issues & History Forum
Topic: Indian Nuclear Submarines -3
Replies: 1432
Views: 195371

Re: Indian Nuclear Submarines -3

hgupta wrote:Why are we paying $3 billion dollars for a ten year lease of a nuke sub? We should be buying it not leasing for that kind of money.

It's a nuclear sub and not for sale.
by PratikDas
17 Feb 2019 03:04
Forum: Military Issues Archive
Topic: Pulwama Attack
Replies: 2282
Views: 182654

Re: Pulwama Attack

Requesting *everyone* to #BoycottPakistaniGoods

Click for a hi-res, shareable version
Image
by PratikDas
08 Feb 2019 12:04
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3967
Views: 828444

Re: Indian Space Program: News & Discussion - Sept 2016

Singha wrote:^^ then how come Ariane5 uses LH2/LOX mix for all its engines? someone was saying thats the exilir of life and the most tfta combo of fuel.

It's pretty good :)

Image

Source:http://www.rocket-propulsion.info/resources/articles/LPRE.pdf
by PratikDas
08 Feb 2019 03:42
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3967
Views: 828444

Re: Indian Space Program: News & Discussion - Sept 2016

Prasanna ji, I found another paper on the metholox engine, same authors. It looks like that they are modifying the CUS engine. May be this is o shorten the time to get to a first prototype engine. But, I don't see why one would replace LH2+LOX with LCH4+LOX. Also, in my heart of hearts, I hope for ...
by PratikDas
04 Feb 2019 07:01
Forum: Strategic Issues & International Relations Forum
Topic: International Nuclear Watch & Discussion
Replies: 1346
Views: 98105

Re: International Nuclear Watch & Discussion

DOE Awards $111 Million to U.S. Vendors to Develop Accident Tolerant Nuclear Fuels January 31, 2019 WASHINGTON, D.C. – The U.S. Department of Energy’s (DOE) Office of Nuclear Energy (NE) has awarded $111.2 million to three industry partners to develop Accident Tolerant Fuels (ATF). General Electric...
by PratikDas
04 Feb 2019 06:17
Forum: Technology & Economic Forum
Topic: Indian IT Industry
Replies: 1089
Views: 142770

Re: Indian IT Industry

Posting on behalf of a friend who isn't on this forum but goes by the name synusthesia : 3SdSKZFoUa8 A Beautiful presentation of how C++ is being used on Mars Rover curiosity. A software engineer from JPL gave this presentation at a C++ conference. My Key takeways: ⋅ C++ was chosen because...
by PratikDas
29 Jan 2019 01:06
Forum: Military Issues & History Forum
Topic: International Aerospace Discussion - Jan 2018
Replies: 1158
Views: 196752

Re: International Aerospace Discussion - Jan 2018

Austin wrote:Very interesting video from ISS Live Feed

UFO or Hoax? WATCH Mysterious Space Objects Buzz Across ISS Live Stream

https://sputniknews.com/viral/201901281 ... -sighting/

Seems like tumbling payload fairings to me.
by PratikDas
28 Jan 2019 08:35
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3967
Views: 828444

Re: Indian Space Program: News & Discussion - Sept 2016

Singha wrote:Japan quickfire sslv called epsilon

https://youtu.be/xanBJkkBH-A

A more relevant launch this January was successful.

Fireworks start at 30 minutes.

by PratikDas
27 Jan 2019 06:04
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3967
Views: 828444

Re: Indian Space Program: News & Discussion - Sept 2016

I think C32 is just C25 but with more fuel. Not a new engine but a new stage with bigger tanks. Perhaps this is obvious to everyone.
by PratikDas
26 Jan 2019 00:03
Forum: Military Issues & History Forum
Topic: International Aerospace Discussion - Jan 2018
Replies: 1158
Views: 196752

Re: International Aerospace Discussion - Jan 2018

Elon Musk's pitch for stainless steel instead of composites: https://www.popularmechanics.com/space/rockets/a25953663/elon-musk-spacex-bfr-stainless-steel/ Ryan D’Agostino: You’ve been busy redesigning Starship. Elon Musk: Yes. The design of Starship and the Super Heavy rocket booster I changed to a...
by PratikDas
21 Jan 2019 15:18
Forum: Military Issues & History Forum
Topic: Indian Missiles News & Discussions - 17 Dec 2018
Replies: 1686
Views: 429525

Re: Indian Missiles News & Discussions - 17 Dec 2018

K-15 test


K-4 test


Quite obviously two very different missiles.
by PratikDas
21 Jan 2019 15:11
Forum: Strategic Issues & International Relations Forum
Topic: Understanding the US - Again
Replies: 3091
Views: 347536

Re: Understanding the US - Again

I'm not a US citizen but I feel qualified to opine thanks to my Bachelor Degree in Common Sense from the University of Being 40 Years Old that when it comes to a shutdown of the US government, the much revered US Constitution almost got it right but failed miserably - like a saddle point in math tha...
by PratikDas
20 Jan 2019 11:50
Forum: Mil-Tech Archive
Topic: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018
Replies: 3910
Views: 897562

Re: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018

Tejas - LCA's Post 14th series produced Tejas, LA - 5014 had her maiden flight yesterday. The 13th member will follow soon. The competition between the two assembly hangars is intensifying. Competition, in one sense, indicates better days are ahead. https://www.facebook.com/tejas.lca/posts/210476366...
by PratikDas
10 Jan 2019 05:08
Forum: Military Issues & History Forum
Topic: Indian Navy News & Discussion - 03 July 2018
Replies: 1950
Views: 428080

Re: Indian Navy News & Discussion - 03 July 2018

nachiket wrote:The new Mumbai-Ahmedabad HSR being built with Japanese help is going to be integrated with the 155mm Dhanush howitzer with two guns mounted on the first and last coaches for self defense against stone throwers and cattle and trucks wandering onto tracks.

:rotfl:
by PratikDas
07 Jan 2019 23:36
Forum: Military Issues & History Forum
Topic: International Military Discussion
Replies: 2966
Views: 355086

Re: International Military Discussion

Israeli F-15 lands safely after losing canopy at 30,000 feet JERUSALEM: The crew of an Israeli air force F-15 warplane fought freezing temperatures and buffeting winds to bring their aircraft down after its cockpit canopy flew off at 30,000 feet, the military said on Monday. In a dramatic cockpit v...
by PratikDas
07 Jan 2019 23:32
Forum: Mil-Tech Archive
Topic: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018
Replies: 3910
Views: 897562

Re: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018

There is no way that IAF/babus will pay more than 1.5x for MK1A than what they are paying for LCA MK1 FOC. This 400 crore per plane cannot be The flyaway cost. IAF/MOD created a committee to look into the price escalation by HAL for MK1A. Nothing has come out which suggest that the committee found ...
by PratikDas
07 Jan 2019 11:42
Forum: Mil-Tech Archive
Topic: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018
Replies: 3910
Views: 897562

Re: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018

Indranil wrote:Jaguar Ms have the 2032. Darin IIIs have the 2052s, IAF's first AESA in service.

Is there any good news on the performance of the 2052 on the DARIN III Jaguars? Is it like having cataracts removed?
by PratikDas
07 Jan 2019 07:16
Forum: Mil-Tech Archive
Topic: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018
Replies: 3910
Views: 897562

Re: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018

So after some internal research I got permission and had autonomy to go with addition of certain alloys that inhibited coarse grain formation to a large extent into these alloys. The result HAL acceptance rates went up and mgmt were happy to see the rejection rate come down. Mgmt was also happy sin...
by PratikDas
05 Jan 2019 07:25
Forum: Mil-Tech Archive
Topic: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018
Replies: 3910
Views: 897562

Re: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018

ArjunPandit wrote:Thanks for making up my day, should we send a 324 tshirt to the retd admiral?

:rotfl:
by PratikDas
30 Dec 2018 12:31
Forum: Military Issues & History Forum
Topic: Russian Weapons & Military Technology
Replies: 1644
Views: 263532

Re: Russian Weapons & Military Technology

Manish_P wrote:Public release cut-out of the Nuclear Powered Torpedo

Any translators here?


This is a start:
https://www.popularmechanics.com/military/weapons/a22537135/russias-nuclear-tsunami-apocalypse-torpedo-is-named-poseidon/

Image
by PratikDas
28 Dec 2018 00:58
Forum: Military Issues & History Forum
Topic: International Military Discussion
Replies: 2966
Views: 355086

Re: International Military Discussion

Mach 27 is 9.2 km/sec , To maintain those speed at 100-200 km altitude where HGV flies most of time and maintain maneuver in lateral and vertical movement for ICBM range as it flies needs a great capability in Hypersonic Aerodynamics and material/structural engineering because most RV would simply ...
by PratikDas
28 Dec 2018 00:06
Forum: Military Issues & History Forum
Topic: Indian Missiles News & Discussions - 17 Dec 2018
Replies: 1686
Views: 429525

Re: Indian Missiles News & Discussions - 17 Dec 2018

Regarding lofted trajectories and their technical purpose, as opposed to their operational purpose where one can use their imagination, this post from Haridas ji in the locked thread was short and sweet. ⋅  Lofted trajectory: Max Q pressure ⋅  Depressed trajectory: Max temperatur...
by PratikDas
27 Dec 2018 11:24
Forum: Military Issues & History Forum
Topic: US military, technology, arms, tactics
Replies: 1420
Views: 196749

Re: US military, technology, arms, tactics

It has some catching up to do given that its competitor has been flying for more than a year now and may upend its first flight by hitting its top cruise speed target of 280 knots around the same time. I’m not a pilot. Nevertheless, from an ease-of-use and operational-safety perspective I’d think t...
by PratikDas
27 Dec 2018 10:34
Forum: Military Issues & History Forum
Topic: US military, technology, arms, tactics
Replies: 1420
Views: 196749

Re: US military, technology, arms, tactics

https://www.armytimes.com/resizer/oAa35l5z0VxCd9MlM_PkhsmCcLA=/1200x0/filters:quality(100)/arc-anglerfish-arc2-prod-mco.s3.amazonaws.com/public/B66P23SDNVAN7F3O2UOOYOKBR4.jpg https://www.armytimes.com/resizer/g7-kzDLMZxY95xjoLVuQjoxxpng=/600x0/filters:quality(100)/arc-anglerfish-arc2-prod-mco.s3.am...
by PratikDas
25 Dec 2018 01:39
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3967
Views: 828444

Re: Indian Space Program: News & Discussion - Sept 2016

Thr video will be of least interest other than for PR. Its the telemetry data and voice transmission they will be worried about. Any higher speed video transmissions will be when they are ovuserhead. I watched Apollo and even for ISS video transmission is selective. IDSS is to reduce download to no...
by PratikDas
24 Dec 2018 00:44
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 4864
Views: 914797

Re: Kaveri & Aero-Engine: News & Discussion

dinesh_kimar wrote:We airily talk about matching Ariane using SB stages.

Just 4 years back, 1800 kg was unobtanium.

With Kaveri, it's the same condition, the physics and the engineering.

Once it's done with 81 KN and 1100 kg weight, we can scale up.


Excellent post, Dinesh ji!
by PratikDas
24 Dec 2018 00:30
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3967
Views: 828444

Re: Indian Space Program: News & Discussion - Sept 2016

https://acadpubl.eu/jsi/2018-118-16-17/articles/16/77.pdf Article on IDRSS satellite system that we are launching Thank you for sharing this informative paper. I don't understand why they're aiming so low at 400 kbps for Human Space Program (HSP) video. https://i.imgur.com/mB5kQS9m.png To put the 4...
by PratikDas
23 Dec 2018 13:56
Forum: Military Issues & History Forum
Topic: Indian Missiles News & Discussions - 17 Dec 2018
Replies: 1686
Views: 429525

Re: Indian Missiles News & Discussions - 17 Dec 2018

Why do I get the feeling that this flurry of tests is India demonstrating that our gun powder is dry?
by PratikDas
23 Dec 2018 13:38
Forum: Military Issues & History Forum
Topic: Indian Missiles News & Discussions - 17 Dec 2018
Replies: 1686
Views: 429525

Re: Indian Missiles News & Discussions - 17 Dec 2018

Agni-IV missile successfully tested India on Sunday successfully test-fired its nuclear-capable long-range ballistic missile Agni-IV, with a strike range of 4,000 km, as part of a user trial by the Army. Radars and electro-optical systems had been positioned along the coast of Odisha for tracking a...
by PratikDas
23 Dec 2018 11:23
Forum: Military Issues & History Forum
Topic: Bharat Ke Veer - GoI Website for Braveheart Martyrs
Replies: 24
Views: 14206

Re: Bharat Ke Veer - GoI Website for Braveheart Martyrs

Akshay Kumar, Rajnath Singh unveil official anthem of 'Bharat Ke Veer' - PTI As part of the "Bharat Ke Veer" initiative, which is a corpus fund to help the families of paramilitary troopers killed in the line of duty, an official anthem was launched here [New Delhi] today. The anthem, sun...
by PratikDas
22 Dec 2018 10:01
Forum: Mil-Tech Archive
Topic: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018
Replies: 3910
Views: 897562

Re: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018

I’m hoping it’s high-speed taxi trials with the Kaveri.

Image
by PratikDas
22 Dec 2018 04:19
Forum: Mil-Tech Archive
Topic: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018
Replies: 3910
Views: 897562

Re: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018

Karan M wrote:I am guessing either FOC or a proto flight with Uttam. FOC more likely as Dileep alluded to 2001 etc.

Why does Dileep ji not allude to things more explicitly? :cry:
by PratikDas
18 Dec 2018 05:27
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3967
Views: 828444

Re: Indian Space Program: News & Discussion - Sept 2016

Image
Click for hi-res

Phenomenal panoramic picture from preparations for GSLV-F11 launch
by PratikDas
28 Nov 2018 03:36
Forum: Mil-Tech Archive
Topic: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018
Replies: 3910
Views: 897562

Re: Tejas Mk.1 & Mk.1A News & Discussions: 09 February 2018

ramana wrote:Kartik, Whats significance of 100 knots? Isn't it too low a an airspeed?

Apologies in advance for speculating but I'd think a low 100 knot airpseed would allow:
  • greater stall avoidance when dogfighting
  • more time for air-to-ground targeting
by PratikDas
30 Sep 2018 11:31
Forum: Strategic Issues & International Relations Forum
Topic: Deterrence
Replies: 4717
Views: 354615

Re: Deterrence

Haridas wrote:Photochor: The Truth About Pakistan's Nuclear Program - YouTube

https://www.youtube.com/watch%3Fv%3Dwci ... bOPf4M3jyp

This is hilarious! Thanks :)
by PratikDas
22 Sep 2018 10:05
Forum: Military Issues & History Forum
Topic: VayuSena Rafale: News and Discussions - 17 Oct 2016
Replies: 2368
Views: 387557

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

After the Dassault statement, it is clear there is no belly to attack. Of course, politicians can keep concocting stories - that Indian MoD forced Dassault to say so, and Modi twisted MoD’s arm, and I twisted Modi’s arm, and my wife twisted my arm, and my toddler twisted hers. Nevertheless, after th...
by PratikDas
05 Sep 2018 10:44
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3967
Views: 828444

Re: Indian Space Program: News & Discussion - Sept 2016

If I understand correctly, the poles are where the multitude of satellites in polar orbit are most likely to collide despite systematic attempts to prevent collisions.
http://www.duncansteel.com/archives/1515

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