Search found 31 matches

by member_29268
04 Feb 2016 05:02
Forum: Trash Can Archive
Topic: IAF Rafale News and Discussions - 26 May 2015
Replies: 3973
Views: 274065

Re: IAF Rafale News and Discussions - 26 May 2015

^^ USAF alone has ~80 fighter squadrons , combine that with marines and navy the total goes to 120..
by member_29268
26 Jan 2016 22:36
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 5219
Views: 1050668

Re: Kaveri & aero-engine discussion

NRao, seems there are lot of projects DRDO is pursuing with academia, couldn't find if those projects can be tracked though.
http://www.drdo.gov.in/drdo/boards/ardb ... ojects.htm
by member_29268
22 Jan 2016 13:24
Forum: Trash Can Archive
Topic: NAL Saras Project demise:Root Cause discussion.
Replies: 35
Views: 2317

Re: NAL Saras Project demise:Root Cause discussion.

They should have asked for funds to complete third plane. There are two sides of it: 1. Designer asked for funds and Remember Saras is a very old project (started in early 1990s) and no national pride was associated by GoI to it as is in the case of Kaveri, Tejas et al. In this context it is quiet ...
by member_29268
22 Jan 2016 00:53
Forum: Trash Can Archive
Topic: NAL Saras Project demise:Root Cause discussion.
Replies: 35
Views: 2317

Re: NAL Saras Project demise:Root Cause discussion.

Some more snaps.


Image

Image


This one is interesting..

Image
by member_29268
22 Jan 2016 00:47
Forum: Trash Can Archive
Topic: NAL Saras Project demise:Root Cause discussion.
Replies: 35
Views: 2317

Re: NAL Saras Project demise:Root Cause discussion.

Some important excerpts from the DGCA report. No Review for 26 test flights? http://i67.tinypic.com/2uyq83l.jpg Non-availability of effective and current SOPs http://i68.tinypic.com/69e3b5.png Non-Availability of monitoring records. http://i68.tinypic.com/ne8e2h.png Who is ADES?. It has no website a...
by member_29268
21 Jan 2016 16:11
Forum: Trash Can Archive
Topic: Indian Military Aviation - 21 Sept 2015
Replies: 4458
Views: 568740

Re: Indian Military Aviation - 21 Sept 2015

GunterH, 1. lets not mix Scientists and Engineers, both have quiet distinct roles and if you really want to see a Scientist/Engineer better visit an ISRO centre. Please have a look at the mandate of NAL's inception. http://nal.res.in/pages/mandate.htm The three mandates seem to be in chronological o...
by member_29268
21 Jan 2016 04:40
Forum: Mil-Tech Archive
Topic: MBT Arjun - News and Discussions
Replies: 1820
Views: 316288

Re: MBT Arjun - News and Discussions

I have known an ex-Army who has test driven the Arjun on multiple occasions (Vijayanta, 72 among others), and he was all praise for the handling (read steering, and bracking specifically) characteristics of Arjun as compared to the others. He went on to say that shifting gears is Makhan and very qui...
by member_29268
21 Jan 2016 04:30
Forum: Trash Can Archive
Topic: Indian Military Aviation - 21 Sept 2015
Replies: 4458
Views: 568740

Re: Indian Military Aviation - 21 Sept 2015

Exactly, why would anyone want to spoil one's career when projects are stopped/cancelled for no apparent reason.? Why would anyone from political establishment be interested in national dreams anyways? What do they know about what should be the pace of a civil aircraft program with 50 mil dollars? O...
by member_29268
20 Jan 2016 14:11
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 277270

Re: Indian Space Programme Discussion

PS 4 propellant loading for C31 is 2.5 t as compared to 1.6 t of C30.
Edit: Which would mean a longer burn duration of PS 4 stage and hence more dV imparted to satellite before separation.
by member_29268
18 Jan 2016 21:58
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 5219
Views: 1050668

Re: Kaveri & aero-engine discussion

NRao, Agree that accepting the failure to achieve what we wanted to is not wrong but it also is a very difficult thing to do. Morever my point is to power 20-30 planes with the K9 version so that lot of data can be generated today and not tomorrow (when K10 will come we don't know) in the real condi...
by member_29268
18 Jan 2016 19:52
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 5219
Views: 1050668

Re: Kaveri & aero-engine discussion

Well I agree that if something is designed it should meet the criteria/spec which is the sole purpose of any design. Now leaving that slightly behind, I believe that you would agree it is extremely important to generate data on your first design and make it pukka before moving to next phase.there ar...
by member_29268
18 Jan 2016 18:51
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 5219
Views: 1050668

Re: Kaveri & aero-engine discussion

Does it really matter that engine is over weight by 150-200 kgs .. or it is 10 % below the expected thrust levels?? I don't think so. It is kind of 1st design of this class of engine and it works. How can we expect it to be as designed. More important is? 1. Is the engine reliable? 2. Can we put it ...
by member_29268
18 Jan 2016 18:34
Forum: Trash Can Archive
Topic: Indian Military Aviation - 21 Sept 2015
Replies: 4458
Views: 568740

Re: Indian Military Aviation - 21 Sept 2015

Well we only had a few decades and our focus have been on lots of other areas as well. Even HAL would not have existed if not for the British/U.S./WW2 etc.. And most of the wind tunnels in the US are pre 1940s when aeronautical research was going at a great pace. Most of the airfoil data bases were ...
by member_29268
18 Jan 2016 02:38
Forum: Trash Can Archive
Topic: Indian Military Aviation - 21 Sept 2015
Replies: 4458
Views: 568740

Re: Indian Military Aviation - 21 Sept 2015

Since we are still on the wind tunnels, found an article by Jha on AMCA. http://m.ibnlive.com/blogs/india/saurav-jha/a-note-on-indias-advanced-medium-combat-aircraft-amca-project-10879-748657.html Relevant part: For one, India is woefully short of wind tunnel facilities at the moment. Internal ADA p...
by member_29268
16 Jan 2016 18:14
Forum: Trash Can Archive
Topic: Indian Military Aviation - 21 Sept 2015
Replies: 4458
Views: 568740

Re: Indian Military Aviation - 21 Sept 2015

^^ can't recall if ever heard about vertical wind tunnel in India. besides it needs to have some scientific application for our shodh establishments to erect one. Other than spin testing I can only think of skydiving practice as another potential application for such a tunnel (might be useful for ou...
by member_29268
15 Jan 2016 00:59
Forum: Trash Can Archive
Topic: Indian Military Aviation - 21 Sept 2015
Replies: 4458
Views: 568740

Re: Indian Military Aviation - 21 Sept 2015

@indranil, The new tail configuration might have to do with spin recovery. See this video at 2:30 https://www.youtube.com/watch?v=dCG5xdy4k10 . It seems that this particular configuration results only in steep spin and not the flat one. Also T tail has problems with early stall but has little to do ...
by member_29268
07 Jan 2016 19:57
Forum: Military Issues & History Forum
Topic: Kaveri & Aero-Engine: News & Discussion
Replies: 5219
Views: 1050668

Re: Kaveri & aero-engine discussion

Let's go on the streets in support of completing the kaveri development. We could ask kejriwal and hazare for their support,they will surely support in the name of swadeshi product. :-)
by member_29268
07 Jan 2016 05:23
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 4036
Views: 336841

Re: LCA Tejas: News and Discussions

Adding to Indranil's explanation.

http://www.linnsideout.se/downloads/transfer-2008-3.pdf

Pages 19-21.
by member_29268
06 Jan 2016 12:26
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 4036
Views: 336841

Re: LCA Tejas: News and Discussions

So, would it be correct to say that we have established it takes a team of less than or equal to 6 million to design a fighter aircraft. Great !! :)
by member_29268
06 Jan 2016 07:23
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 277270

Re: Indian Space Programme Discussion

vina, weakass-ness of engines (if you compare N2O4/UDMH vs LOX/RP-1 based engines) has nothing to with the propellant used. both of these propellant combination have very little different in specific impulse (316s for RD-253(Proton 1st stage) and 335 for SCE-200(ISRO's SC Engine)) to make any signif...
by member_29268
05 Jan 2016 17:03
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 4036
Views: 336841

Re: LCA Tejas: News and Discussions

Even though a platform has digital control system (which controls both the static and dynamics stability), the overall performance characteristics depends a lot on the plant (aircraft) dynamics as well. i.e. e.g. how does the aircraft behave (read handling characteristics) on a pitch control input a...
by member_29268
05 Jan 2016 09:33
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 277270

Re: Indian Space Programme Discussion

Somehow Angara seems to be the solution to ISRO's all needs. It is based on a 2 MN engine core stage. I am sure our launch vehicle design team must have looked at this option :) . https://en.wikipedia.org/wiki/Angara_(rocket_family) Replacing a solid stage with liquid stage of an existing vehicle ha...
by member_29268
05 Jan 2016 08:57
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 4036
Views: 336841

Re: LCA Tejas: News and Discussions

ELM-2052 is 80-180 kgs depending on antenna size against that of 2032 which is 72-100 kgs according to the IAI brochure. So it should be taking 1/3rd of the ballast weight.
by member_29268
04 Jan 2016 23:44
Forum: Trash Can Archive
Topic: LCA Tejas: News and Discussions
Replies: 4036
Views: 336841

Re: LCA Tejas: News and Discussions

Weight reduction with re-arrangement of some of the sub-systems (which is being planned) may result in insignificant change in CG at aircrafts dry weight (which will be lower finally). This might lead to removal of ballast as well (and hence 300 kg net gain :) ).
by member_29268
04 Jan 2016 23:26
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 277270

Re: Indian Space Programme Discussion

vina wrote: Quote: Currently the GSLV MK 3 uses the CE20 engine and once we put the semi cryogenic engine in such a combination, we will have a much bigger rating, which will have a payload capability of 10 ton Better still, get rid of those two huge low isp solid booster and cluster two of those 2...
by member_29268
04 Jan 2016 23:13
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 277270

Re: Indian Space Programme Discussion

Better still, get rid of those two huge low isp solid booster and cluster two of those 2MN Lox/hydrocarbon engines , together with the CE 20 stage will give a launcher with a performance equivalent or better than the Saturn V, and will be very efficient. Saturn V's 5 F-1 Engines produce >6MN each, ...
by member_29268
04 Jan 2016 22:55
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 277270

Re: Indian Space Programme Discussion

vina, ISRO might have been reading your posts. :) (If we go by the following wiki page)
https://en.wikipedia.org/wiki/Unified_Launch_Vehicle
by member_29268
15 Dec 2015 21:24
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 277270

Re: Indian Space Programme Discussion

Looking at the time gap between PS4 shut-off and re-start, which is ~46minutes (1/2 of the orbital period for the altitude at which satellites will be injected for this mission) and will bring the PS4 stage at diametrically opposite end (apogee /perigee) of the orbit. Looks as an orbit raising manoe...
by member_29268
15 Dec 2015 13:38
Forum: Trash Can Archive
Topic: Indian Military Aviation - 21 Sept 2015
Replies: 4458
Views: 568740

Re: Indian Military Aviation - 21 Sept 2015

LCA, LCA Mk1A, LCA Mk 2, AMCA, FGFA, AURA, ... Too many programs vs the same design team. I wonder if similar situation exists anywhere else...One designer focusing on too many developmental projects at the same time is bound to slow down the progress of all of them.
by member_29268
15 Dec 2015 12:43
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 277270

Re: Indian Space Programme Discussion

I think PS4 as a multi start engine can be used to inject future satellites (probably All-electric ones) to a different/higher orbit. Additional propellant loading with a multi start engine capability might give one more push to the satellite before separation. But the question is would we have the ...
by member_29268
30 Nov 2015 13:40
Forum: Trash Can Archive
Topic: Indian Space Programme Discussion
Replies: 3934
Views: 277270

Re: Indian Space Programme Discussion

I hope ISRO is providing the same level of attention to more powerful EPS devices as to GSLV Mk3. It will take a lot less in terms of financial and human resources for maturing EPS technology to produce all-EPS satellites than a whole launch vehicle.

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