LVM3/GSLV Mark III News, Discussions, Updates and Reports

Vamsi

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It seems like there are similar looking thrusters on PSLV interspaced between full strapons called sitvc. I never really paid attention but looks like their purpose is attitude control mostly unless I am mistaken?

For PSLV they are both SITVC & Roll control, PSLV 4th stage engines are actually uprated version of these Roll Control Thrusters.
 

Vamsi

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Can't wrap my head around how that thing will turn at 19,000 rpm. Its a bloody amazing piece of tech when you think about it.
Yep, you know what, the reason why it's taking so long to realise this engine is because ISRO is literally reverse engineering the "know-why" of the engine.We only got the blue prints of the engines.We didn't bought any mathematical models, manufacturing methods, raw materials etc. ISRO literally reverse-engineered all of them.For eg, RD-810 uses RP-1, while SCE-200 uses ISROSCENE.It's not just the Indian version of RD-810, it's just not the copy paste version. It's an effort of Indigenous R&D. It's a derivative of RD-810. It is different from RD-810 in many ways. Only the drawings of the engine are Ukrainian, everything else is ours.
 
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Okabe Rintarou

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Yep, you know what, the reason why it's taking so long to realise this engine is because ISRO is literally reverse engineering the "know-why" of the engine.We only got the blue prints of the engines.We didn't bought any mathematical models, manufacturing methods, raw materials etc. ISRO literally reverse-engineered all of them.For eg, RD-810 uses RP-1, while SCE-200 uses ISROSCENE.It's not just the Indian version of RD-810, it's just not the copy paste version. It's an effort of Indigenous R&D. It's a derivative of RD-810. It is different from RD-810 in many ways. Only the drawings of the engine are Ukrainian, everything else is ours.
True. I think in reality even the RD-810 is till now just on the drawing board. I remember reading that its never actually been fabricated or flown. So SCE-200 is practically a new engine.
 

karn

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True. I think in reality even the RD-810 is till now just on the drawing board. I remember reading that its never actually been fabricated or flown. So SCE-200 is practically a new engine.
Fabricated but never flown .. Not sure if hot fired ever.
 

Indx TechStyle

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GSLV-Mk3 production must be increased to 6/yr from 2, Isro strengthening NavIC: Somanath
NEW DELHI: Close on the heels of its first commercial mission, Isro chairman S Somanath said India will need to increase the production capacity of of the GSLV-Mk3 or LVM3, and that the space agency is also working on strengthening NavIC, India's regional navigation satellite system.
"The Mk3 is our best commercial bet. But production capability constraints need to be addressed. We can build two GSLV-Mk3 rockets a year now. We need to increase this to at least six. We need more collaboration to do this," Somanath said at the inaugural of the India Space Congress 2022 here.
The three-day Congress that kicked off Wednesday, discussed a variety of issues related to the space sector.
Organised by SIA-India (Satcomm India Association) the event is supported by Isro, IN-SPACe, NSIL, DoT, MoD and the NITI Aayog apart from various domestic and international trade bodies.
Reiterating that the other new rocket from Isro— the small satellite launch vehicle (SSLV) —will be completely transferred to the industry for production, Somanath said, the industry will play a bigger role in rocketry in the future.
Isro, through Space PSU NewSpace India Limited (NSIL) has already given out the contract for manufacturing of five PSLVs to industry. The HAL-L&T consortium bagged this deal.
"...But we have a bigger goal of building a newer rocket. And to achieve this in a short span of time will only be possible with industry collaboration," Somanath said.
He added that the next generation launch vehicle (NGLV) will be “cost conscious, production friendly, which can be built in India and operated globally”. The NGLV will also proposed to be reusable.
Isro is in the process of defining the design of the NGLV, after which it would be taken to the industry for feedback.
"Even when it comes to satellites, we would like to see the industry build more of them. Isro is ready to become the anchor customer and use satellites built by such companies which will also help them in gaining trust from international customers," Somanath said.
Boosting NavIC
Isro, whose NavIC system is yet to penetrate the commercial market or find extensive deployment otherwise, is in the process of strengthening the programme with new generation satellites.
Elaborating on the sidelines of the event, he said: "Of the seven NavIC satellites, some have failed, we need to replace a few and work on this is happening. However, we've also realised that to make it more effective, we need to have satellites in the L1 band and in a different orbit. We'll also need to look at security of signals."
The present constellation of NavIC satellites operate in the L-5 and S bands and are placed on a geostationary orbit (GEO).
"...We'll need satellites in the L-1 band for the transition from a regional satellite to a global one. For the same reason we also need NavIC satellites in a MEO (medium Earth orbit), which will happen. We have five satellites under production," Somanath added.
 

Swesh

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The flight acceptance hot test of a CE-20 engine is successfully carried out for a duration of 25 s in the High Altitude Test facility of ISRO Propulsion Complex at Mahendragiri on October 28, 2022. This engine is earmarked for the LVM3-M3 mission identified for the launch of the next set of 36 numbers of OneWeb India-1 satellites.

The cryogenic upper stage of the LVM3 vehicle (C25 stage) is powered by a CE-20 engine working with the LOX-LH2 propellants combination. This engine develops a nominal thrust of 186.36 kN in vacuum.

The major objectives of the flight acceptance test were to confirm the integrity of the hardware, assessment of subsystems' performance and tune the engine for meeting the mission requirements parameters for engine tuning for flight operation. Analysis of test data confirmed the satisfactory performance of the engine systems. This engine will be assembled to the C25 flight stage being integrated for the LVM3 M3 vehicle.
 

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The flight acceptance hot test of a CE-20 engine is successfully carried out for a duration of 25 s in the High Altitude Test facility of ISRO Propulsion Complex at Mahendragiri on October 28, 2022. This engine is earmarked for the LVM3-M3 mission identified for the launch of the next set of 36 numbers of OneWeb India-1 satellites.

The cryogenic upper stage of the LVM3 vehicle (C25 stage) is powered by a CE-20 engine working with the LOX-LH2 propellants combination. This engine develops a nominal thrust of 186.36 kN in vacuum.

The major objectives of the flight acceptance test were to confirm the integrity of the hardware, assessment of subsystems' performance and tune the engine for meeting the mission requirements parameters for engine tuning for flight operation. Analysis of test data confirmed the satisfactory performance of the engine systems. This engine will be assembled to the C25 flight stage being integrated for the LVM3 M3 vehicle.
They have postponed Chandrayaan-3 in favour of OneWeb launch. Haven't they?
 

knathan

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Sir
My questions may be silly, but i want to know the results,
Anyone please explain
In LVM 3.
1.
replace L110 with L180 (just add. 70+ tonne fuel) (dont pull aerodynamics here, we can refine.)
2.
ignite L180 first, after reaching required thrust then ignite S200 (here we get a safe ignition of liquid engine otherwise we can abort the mission.)
3.
By this arrangements we may be have safe liftoff + high reliable vehicle + increased payload.
Thats all sir
Thanks in advance...
 

Vamsi

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Sir
My questions may be silly, but i want to know the results,
Anyone please explain
In LVM 3.
1.
replace L110 with L180 (just add. 70+ tonne fuel) (dont pull aerodynamics here, we can refine.)
2.
ignite L180 first, after reaching required thrust then ignite S200 (here we get a safe ignition of liquid engine otherwise we can abort the mission.)
3.
By this arrangements we may be have safe liftoff + high reliable vehicle + increased payload.
Thats all sir
Thanks in advance...
1. L180, you need 4 Vikas engines
2.Thrust to weight ratio will be less than 1, hence impossible
 

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