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#240
by
antriksh
on 25 Sep, 2014 04:45
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This engine has to be taken through a series of ground test and then the cryogenic stage will be integrated to it and it will be tested on the ground. Once it qualifies, Isro will use it for the flight. By the time the cryogenic stage is ready for the flight we will also study from the experimental mission about the vehicle's configuration and aerodynamic behaviour, and if any marginal improvement is needed, we can will do that
GSLV Mark-III test flight before December[/url]
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#241
by
vineethgk
on 25 Sep, 2014 15:00
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With the two S-200 boosters firing, this could very well be the 'smokiest' launch yet for ISRO..
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#242
by
chota
on 26 Sep, 2014 02:35
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#243
by
antriksh
on 26 Sep, 2014 02:42
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With the two S-200 boosters firing, this could very well be the 'smokiest' launch yet for ISRO..
add to that vapor cloud due to S200 exhaust meeting water from acoustic suppression system.
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#244
by
vineethgk
on 26 Sep, 2014 04:17
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With the two S-200 boosters firing, this could very well be the 'smokiest' launch yet for ISRO..
add to that vapor cloud due to S200 exhaust meeting water from acoustic suppression system.
That would be a spectacle! Good to see the mission is on track to launch before the end of the year, if weather holds good. If it works out as planned, 2014 could very well become a historic year for ISRO - Indigenous cryo success, Mars mission and GSLV-III test flight. Radhakrishnan can retire as one big happy man, considering the challenges he faced at start..
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#245
by
sanman
on 27 Sep, 2014 22:13
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I wonder how much time and effort would be required to see possible further iterations like a Mark-IV (4 SRBs) or a Mark-V (6 SRBs)?
I realize that ISRO wants to move to development of the ULV family, but I was hoping that GSLV Mark-IV and Mark-V might be easy enough to upgrade to, so that their iterations might make an early appearance, even if only briefly.
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#246
by
antriksh
on 28 Sep, 2014 03:28
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I wonder how much time and effort would be required to see possible further iterations like a Mark-IV (4 SRBs) or a Mark-V (6 SRBs)?
I realize that ISRO wants to move to development of the ULV family, but I was hoping that GSLV Mark-IV and Mark-V might be easy enough to upgrade to, so that their iterations might make an early appearance, even if only briefly.
I think it wont be economical and so ISRO might not prefer using 4-6 SRBs. ISRO might use more SRBs only if there is an urgent requirement to launch > 5 ton payload. My understanding is that once semi-cryo stage (SC-160, ground lit) is ready, it will replace core of lvm3.
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#247
by
sanman
on 28 Sep, 2014 04:10
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I think it wont be economical and so ISRO might not prefer using 4-6 SRBs. ISRO might use more SRBs only if there is an urgent requirement to launch > 5 ton payload. My understanding is that once semi-cryo stage (SC-160, ground lit) is ready, it will replace core of lvm3.
SC160 will be some time coming. I personally believe that ISRO should have pursued development of semi-cryo propulsion ahead of cryogenic propulsion. This would have allowed Indian launch capabilities to progress beyond PSLV much faster, instead of treading water in the meantime. Oh well, 20-20 hindsight, I guess.
But so LMV3 with SC160 is then essentially ULV. What more does ULV need besides that, since C-25 will already be developed by then.
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#248
by
vineethgk
on 28 Sep, 2014 07:45
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I wonder how much time and effort would be required to see possible further iterations like a Mark-IV (4 SRBs) or a Mark-V (6 SRBs)?
I realize that ISRO wants to move to development of the ULV family, but I was hoping that GSLV Mark-IV and Mark-V might be easy enough to upgrade to, so that their iterations might make an early appearance, even if only briefly.
Correct me if I am wrong here, but I remember reading somewhere (maybe in NSF itself, not sure though) that adding two more SRBs to make MK-IV will only add another 500kg or so to the GTO payload capability. If that were so, it may not be worth the extra effort.
But so LMV3 with SC160 is then essentially ULV. What more does ULV need besides that, since C-25 will already be developed by then.
As per reports, ULV would have the SC-160 and C-25 as the 'core' and solid strapons of various sizes added to achieve a broad range of payload capabilities. antariksh had posted a concept image
in this forum It may not be the final plan, but the image implies reuse of solid stages of PSLV (S-12, S-139) and what seems to be a new intermediate S-60 strapon.
It makes me wonder though, if the intention of ULV is to replace PSLV/GSLV entirely, wouldn't it be worthwhile to standardize strapons to, maybe, two types (maybe an S-40 and S-139, just guessing) and have combinations of 2/4 to get the desired payload range? That might simplify logistics in the long term. Maybe I'm going a bit overboard here, and this needs to be discussed in the ULV thread.
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#249
by
baldusi
on 28 Sep, 2014 15:32
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This is not the thread but I have made exactly that suggestion on the ULV thread.
AIUI, the S200 are huge and adding more is not an easy step. I'm more interested in what human rating standards are they going to apply to the GSLV mkIII to carry the Indian Capsule. And how long will they use it once they transition to ULV. If it can have a heavy version, they might do away with solids.
In other words, will the GSLV mkIII be used only to certificate the Indian capsule or will it carry Indian crew?
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#250
by
vineethgk
on 28 Sep, 2014 17:21
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This is not the thread but I have made exactly that suggestion on the ULV thread.
AIUI, the S200 are huge and adding more is not an easy step. I'm more interested in what human rating standards are they going to apply to the GSLV mkIII to carry the Indian Capsule. And how long will they use it once they transition to ULV. If it can have a heavy version, they might do away with solids.
In other words, will the GSLV mkIII be used only to certificate the Indian capsule or will it carry Indian crew?
Yep... My bad. Should have referred to your comment here. Sorry.
If ULV variants replaces the current PSLV/GSLV-II/GSLV-III fleet, ISRO is gonna have to meet a large demand for the core stages and the boosters, and I reckon that is something which can be met only by a greater level of involvement by the private industry. Having less number of booster types could be a big advantage there. I envision a wonderland where these rocket stages are built by private consortiums and shipped to the launch center to be assembled and launched by ISRO. But thats another story..
As for your question, my guess is that it would depend on
when ISRO plans to have a manned mission. SCE-160 is going to take time to develop, so if ISRO plans to have manned launches by early 2020s it may have to man-rate GSLV-III.
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#251
by
antriksh
on 29 Sep, 2014 07:59
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This is not the thread but I have made exactly that suggestion on the ULV thread.
AIUI, the S200 are huge and adding more is not an easy step. I'm more interested in what human rating standards are they going to apply to the GSLV mkIII to carry the Indian Capsule. And how long will they use it once they transition to ULV. If it can have a heavy version, they might do away with solids.
In other words, will the GSLV mkIII be used only to certificate the Indian capsule or will it carry Indian crew?
from ISRO report :
For meeting the requirements of HSP, human rating of GSLV MK III or LVM3 will also be initiated in the 12th plan period. The work will involve the following:
1.Redesign of vehicle structures including propellant tanks and motor cases if necessary.
2. Re-qualification tests including stage functional tests of S200, L110 and C25.
3. Intelligent systems to monitor and identify the imminent failure of systems are to be developed.
4. Redundancy schemes in all the avionics, control systems, pyro systems and mechanisms are to be re-looked and re-qualified.
4. Additional facilities for structural test are to be developed for conducting these tests.
I think heavy version of ULV will depend mainly on the requirement to launch heavier payload. My guess, TSTO-RLV will be doing the heavy lifting of 10 ton to GTO. BTW, I would love to see a Manned version of TSTO-RLV with a Human spacecraft as second stage.
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#252
by
baldusi
on 29 Sep, 2014 14:53
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So, GSLV mk.III is nowhere human rated and doing that is left as an exercise for the next administration?
I believe that it might be easier to go to ULV directly. But that's just me. ISRO has shown a great capability for improving their vehicles at a fraction of Western costs.
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#253
by
antriksh
on 30 Sep, 2014 04:36
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So, GSLV mk.III is nowhere human rated and doing that is left as an exercise for the next administration?
I believe that it might be easier to go to ULV directly. But that's just me. ISRO has shown a great capability for improving their vehicles at a fraction of Western costs.
LVM3 development is not complete and will take 3 more years to start development flights. But man rating is concurrent and an ongoing program to be completed in the 12th 5 year plan by 2017. All the subsystems like s200, l100 etc will be manned rated during this period. There is no rush for human space flight.
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#254
by
baldusi
on 30 Sep, 2014 12:59
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So, GSLV mk.III is nowhere human rated and doing that is left as an exercise for the next administration?
I believe that it might be easier to go to ULV directly. But that's just me. ISRO has shown a great capability for improving their vehicles at a fraction of Western costs.
LVM3 development is not complete and will take 3 more years to start development flights. But man rating is concurrent and an ongoing program to be completed in the 12th 5 year plan by 2017. All the subsystems like s200, l100 etc will be manned rated during this period. There is no rush for human space flight.
Ok, I misunderstood, I thought that it was going to be initiated by 2017. If they are doing it concurrently, then its more logical. I still wonder about the standards. But I guess that this design will have a lot less failure modes than GSLV mk.I/II.
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#255
by
abhishek
on 01 Oct, 2014 19:24
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We hope to move the prototype to Sriharikota spaceport in ten days’ time,’’ GSLV Mk-III project director S Somnath said. An important component of ISRO’s Human Spaceflight Programme, such capsules, fitted aboard rockets, are intended to carry astronauts to orbit and return them safely to earth. Hindustan Aeronautics Ltd (HAL) was responsible for the basic structure of the dummy module, but VSSC has been handling all the critical aspects including integration, heat shields and control and guidance systems.
Crew Module Prototype to be Tested Aboard GSLV MK-III
http://www.newindianexpress.com/states/kerala/Crew-Module-Prototype-to-be-Tested-Aboard-GSLV-MK-III/2014/10/01/article2457591.ece
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#256
by
antriksh
on 02 Oct, 2014 15:12
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#257
by
cave_dweller
on 02 Oct, 2014 16:01
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India Poised To Expand Presence in Global Launch Market
one GSLV Mark 3 vehicle should be available per year for commercial sale starting in 2017. The vehicle is designed to launch telecommunications satellites weighing around 4,000 kilograms.
What is the reason for such a low volume?
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#258
by
Steven Pietrobon
on 03 Oct, 2014 05:44
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Perhaps their production line isn't capable of a higher rate.
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#259
by
vineethgk
on 03 Oct, 2014 06:04
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What is the reason for such a low volume?
My 2 cents..
The initial volume of commercial GSLV-III launches might be constrained due to:
a) Lower initial production capacityDuring the said period, ISRO would need to assemble stages for three launch vehicles (assuming GSLV-II isn't retired by then). Unless they expand the production capabilities and workforce (or transition PSLV to a private consortium), its going to be difficult for them to produce more rockets.
b) Availability of launch infrastructureWhen the second VAB becomes operational, ISRO might to be able to make 8-10 launches a year - a large number of them could be PSLV launches. Supporting more number of launches beyond that they may require the Third Launch Pad.
c) Larger domestic demand for satellite launchesDue to skyrocketing demands from the domestic media industry, ISRO currently faces a large shortfall of available transponders in its comsats, which they are currently trying to offset by leasing transponders from other sats. The demand for transponders are likely to accelerate further in the future and can be met only by launching more number of heavier GSATs by available GSLV-IIIs.
My hunch is that GSLV-III wouldn't be ready for commercial operations by 2017. The CE-20 needs to complete all its tests and then they would need to build and test the C-25 stage with it. They might start development flights during the said period and then make it available for commercial launches after 2-3 successful flights.
