Indian Space Program: News & Discussion

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Nikhil_Naya
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Re: Indian Space Program: News & Discussion

Post by Nikhil_Naya »

the PSLV has made it boring!!! - I mean, successful launch and not even a whimper on the social circuit! :). I think just for fun, they must launch one in the opposite direction...or like rolling start or something....Well done ISRO!
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Re: Indian Space Program: News & Discussion

Post by gakakkad »

one of the highlights of this launch was the Bellatrix hall effect ion thruster for positioning the satellite . Bellatrix is a desi startup with a young founder.. congratulations to them...
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Re: Indian Space Program: News & Discussion

Post by Vips »

Any update on the upcoming launches?
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Re: Indian Space Program: News & Discussion

Post by Varoon Shekhar »

gakakkad wrote:one of the highlights of this launch was the Bellatrix hall effect ion thruster for positioning the satellite . Bellatrix is a desi startup with a young founder.. congratulations to them...

Eagerly awaiting news of the success of this payload!
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Re: Indian Space Program: News & Discussion

Post by SSridhar »

Vips wrote:Any update on the upcoming launches?
Vips, Somnath said that in the next few months there will be three launches: GSLV, LVM-3 & PSLV
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Re: Indian Space Program: News & Discussion

Post by SSridhar »

Varoon Shekhar wrote:Eagerly awaiting news of the success of this payload!
Just to clarify, this is an experimental payload in the spent 4th stage that is also in orbit. This 4th stage is called PSLV Orbital Experimental Module or POEM and it carries 7 payloads for testing and validation. Another interesting thing is that the PS4 spent stage will also deploy a solar panel to power these experimental payloads.
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Re: Indian Space Program: News & Discussion

Post by SriKumar »

SSridhar wrote:
Varoon Shekhar wrote:Eagerly awaiting news of the success of this payload!
Just to clarify, this is an experimental payload in the spent 4th stage that is also in orbit. This 4th stage is called PSLV Orbital Experimental Module or POEM and it carries 7 payloads for testing and validation. Another interesting thing is that the PS4 spent stage will also deploy a solar panel to power these experimental payloads.
Nice. So the 4th stage is also, effectively a satellite. Max use of launch energy. Any word on what the other 6 payloads are? i guess this stage has attitude control (thrusters) to remain locked to sun position.
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Re: Indian Space Program: News & Discussion

Post by Ashokk »

Vips wrote:Any update on the upcoming launches?
1st inflight abort test for #Gaganyaan is now slated for June
Dr Somanath says the 1st inflight abort test for #Gaganyaan is now slated for June when the Crew Module will be launched to 12-14 km altitude where it'll demonstrate crew escape capability under Max-Q conditions.

+ 1st uncrewed orbital mission is now expected in Feb 2024. #ISRO
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Re: Indian Space Program: News & Discussion

Post by Varoon Shekhar »

SSridhar wrote:
Varoon Shekhar wrote:Eagerly awaiting news of the success of this payload!
Just to clarify, this is an experimental payload in the spent 4th stage that is also in orbit. This 4th stage is called PSLV Orbital Experimental Module or POEM and it carries 7 payloads for testing and validation. Another interesting thing is that the PS4 spent stage will also deploy a solar panel to power these experimental payloads.
I realise that. We should be hearing pretty soon, whether the Bellatrix propulsion experiment succeeded. :) For the PSLV C-53 last June, within a day or two came the news of the success of the component ( satellite deployer) of Dhruva, and Digantara's weather sensor. Dhruva and Digantara are two recent Indian space start-ups.
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Re: Indian Space Program: News & Discussion

Post by Atmavik »

A video abt the belatrix experiment

https://youtu.be/h2vEB5pHjzY
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Re: Indian Space Program: News & Discussion

Post by sanman »

Atmavik wrote:A video abt the belatrix experiment

https://youtu.be/h2vEB5pHjzY
I once talked to these guys, and the CEO is little more marketing oriented, while the CTO is more tech type handling the technology side. They're both young guys in their mid-twenties.
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Re: Indian Space Program: News & Discussion

Post by Vips »

SSridhar wrote:
Vips wrote:Any update on the upcoming launches?
Vips, Somnath said that in the next few months there will be three launches: GSLV, LVM-3 & PSLV
Thanks SSridharji.
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Re: Indian Space Program: News & Discussion

Post by Cyrano »

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Re: Indian Space Program: News & Discussion

Post by disha »

Jingoes here are not doing their job!

Here is the news that should warm up Jingoes:

https://www.myind.net/Home/viewArticle/ ... nic-engine

In nutshell, the shower head is working and has enough pressure. Now the thrust chamber has to be added for engine completion. Still a long way to go though.

Only reason I support semi-cryo is:

1. To replace the hypergolic L110 stage in Mk-III series.
2. Path to MethoLox engines.

India is also a leader in Solid rocket engines (the other being US/NASA and ESA). Solid rocket engines have distinct advantages. They are cheaper and provide significant thrust and hence as booster rockets. Of course, the next step for ISRO is to take something like CL-20 and use it for satellite launches.
Last edited by disha on 11 May 2023 23:43, edited 1 time in total.
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Re: Indian Space Program: News & Discussion

Post by Cyrano »

First of all I'd thank this naari ji for visiting the exhibition and making the video. But her commentary - dunno if I should laugh or cry :roll:

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Re: Indian Space Program: News & Discussion

Post by Ashokk »

Tests commenced on Semicryogenic engine at IPRC, Mahendragiri

May 10, 2023

Today, ISRO carried out the first integrated test on an intermediate configuration of the 2000kN Semicryogenic Engine at the newly commissioned Semicryogenic Integrated Engine & Stage Test facility at the ISRO Propulsion Complex(IPRC), Mahendragiri. The intermediate configuration, designated as Power Head Test Article (PHTA), comprises all the engine systems except the thrust chamber. The test is the first of a series of tests planned to validate the design of the propellant feed system, including the low-pressure and high-pressure turbo-pumps, the gas generator, and control components.

The Liquid Propulsion Systems Centre (LPSC) of ISRO has undertaken the design &development of a Semicryogenic engine with 2000 kN thrust with Indian industry participation, and will power the booster stages of future launch vehicles and works on Liquid Oxygen (LOX)-Kerosene propellant combination. The test on May 10, 2023, is a major milestone beforeintegrating the complete engine and its qualification. This test demonstrated the complex chill-down operations spanning about 15 hours duration that was conducted successfully, meeting all the required conditions for engine start.After the chill down of the LOX circuit, the feed circuit of kerosene was filled, and LOX was admitted into the gas generator by opening the injection valve. Successful performance of the test article helps derive the sequence of operations for further tests.

The newly established test facility at IPRC, Mahendragiri, with a state-of-art PLC-based control system and data acquisition system, is capable of testing semi-cryogenic engines up to 2600 kN thrust and will support the subsequent testing and qualification of the fully integrated Semicryogenic engine and stage.This test has demonstrated the successful performance of the test facility and power head test article in the first attempt itself.
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Re: Indian Space Program: News & Discussion

Post by Neela »

MTAR Technologies Annual Report FY23
https://www.youtube.com/live/EijD78us0ok?feature=share

Summary:
Aim is to fully develop & launch SSLV. 4 year development period .10 scientists from ISRO hired. Working with ISRO and collaborating with them. Lots of technologies involved. We are on track.
For MTAR it is a game changer

(back of envelope : $8000/kg x 500 = $4 million) per launch . I assume current numbers for $/kg)
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Re: Indian Space Program: News & Discussion

Post by Prem »

https://twitter.com/ISROSpaceflight/sta ... 92736?s=20
WE HAVE A LAUNCH DATE!
On 12th July 2023, a GSLV Mk-III rocket will lift off from the Sriharikota launching the Chandrayaan-3 spacecraft which will then attempt a soft touchdown near the Lunar South Pole on 23rd August!#ISRO
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Re: Indian Space Program: News & Discussion

Post by Varoon Shekhar »

First info and pics of GSLV Mk 2 and NVS-01 are up. Nice to know the satellite weighs in at 2232kg! I for one was concerned that the capacity of the GSLV Mk2 would be greatly underutilised with another 1425kg IRNSS satellite! :) First use of indigenous atomic clock.

https://www.isro.gov.in/GSLV_F12_Landingpage.html

https://www.isro.gov.in/GSLV_F12_NVS01_gallery.html


May 22, 2023
The launch of the GSLV-F12/NVS-01 mission is scheduled on Monday, May 29, 2023 at 10:42 hours IST from the second launch pad at SDSC-SHAR, Sriharikota. This Geosynchronous Satellite Launch Vehicle (GSLV) mission is designed to deploy the NVS-01 navigation satellite, weighing about 2232 kg, into a Geosynchronous Transfer Orbit. Subsequent orbit raising maneuvers will be used for taking the satellite to the intended orbit.

NVS-01 is the first of the second-generation satellites envisaged for the Navigation with Indian Constellation (NavIC) services. NVS series of satellites will
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Re: Indian Space Program: News & Discussion

Post by SSridhar »

GSLV-F12/NVS-01 Mission 29 May 2023 at 10:42 AM IST

Brochure
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Re: Indian Space Program: News & Discussion

Post by Varoon Shekhar »

^^^
A bit of trepidation for this launch/mission, sure I'm not the only one! ...more so than with the larger GSLV Mk 3. It's because of the history of the GSLV Mk2, 2 failures and one abort at the last minute. ISRO would have made the necessary adjustments, and the likelihood of success is high. Still...fingers crossed!
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Re: Indian Space Program: News & Discussion

Post by SSridhar »

Excellent launch. Copybook. CUSP performed as expected.

Quite a few new technologies incorporated both in the vehicle and in the payload.
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Re: Indian Space Program: News & Discussion

Post by Pratyush »

https://m.timesofindia.com/videos/news/ ... 585935.cms

May 29, 2023, 12.40 PM IST

It is now so routine, that members are not even talking the time of post congratulations to ISRO. :mrgreen:
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Re: Indian Space Program: News & Discussion

Post by rahulm »

4m fairing (up from 3.4m) means larger satellites can be launched.

Brochure

Space qualified desi rubidium clock
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Re: Indian Space Program: News & Discussion

Post by SSridhar »

rahulm wrote:4m fairing (up from 3.4m) means larger satellites can be launched.
Yes, true. There have been quite a few modifications to the CUS too after the FAC had made some recommendations, following F-10. The Range Director made it a point to frequently announce 'Cryo Stage Performance Normal' and every time he did this, there would be loud cheer from a section of young men & women within the Control Room, presumably engineers who worked on the modified CUS.

INS also has some updates, it seems.
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Re: Indian Space Program: News & Discussion

Post by SSridhar »

IAF Chief as well as Naval & Army officers attended the launch
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Re: Indian Space Program: News & Discussion

Post by SriKumar »

About 10 seconds gap between CUS ignition command issuance (at 399 s) and confirmation of ignition. They must have changed some process there. In the past, several CUS failures were at the point of ignition starting but not sustaining.
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Re: Indian Space Program: News & Discussion

Post by Vips »

ISRO looking at testing Gaganyaan crew module mission by July, says Chairman Somanath.

The Indian Space Research Organisation is gearing up for a host of activities at the spaceport here, including testing of the crew module in July for its ambitious Gaganyaan mission, Chairman S Somanath said here on May 29.

The Secretary of the Department of Space said the space agency was also working for the launch of the synthetic aperture radar mission in association with National Aeronautics Space Agency (NASA).

The NISAR (NASA-ISRO Synthetic Aperture Radar Mission) is a joint earth-observing mission between NASA and ISRO with the goal of making global measurements of the causes and consequences of land surface changes using advanced radar imaging.

Talking about future launches, Mr. Somanath said the next launch would be a climate and weather observation satellite called “INSAT-3Ds”, which would be launched using a GSLV rocket.

"The same rocket [GSLV] is bound to take the NISAR as well. In the coming months we are going to have launches of PSLVs as well as GSLV MkIII " he said.

"The SHAR [Satish Dhawan Space Centre, Sriharikota] will be abuzz with activities towards all of this.", he said.

Scientists are working on conducting various tests for the ambitious Gaganyaan mission and the agency is coordinating with the Navy and others in this connection, he said.

"We will be launching a test vehicle mission now. Target is to conduct it by July. The vehicle for conducting the test is already here in Satish Dhawan Space Centre here." he said.

This launch would demonstrate how the crew escapes in case of any accident during the Gaganyaan mission, he said.

"The vehicle will be taken to an altitude of 14 km and from there we would create a problem or try to destroy it and see how the crew module escapes. That we have to demonstrate. We are talking to various stakeholders like the Navy." he said.

This mission has to be repeated again and after that there would be an unmanned mission probably next year in which the whole crew module would be taken to orbit and return, he said.

On setting up a launch pad in Kulasekarapattinam in Tamil Nadu about 600 km from Chennai, he said ISRO was almost in the final stages of acquiring 2,000 acres of land. "We will be building a launch pad for a small launch vehicle in Kulasekarapattinam and possible rocket launches for private players in future. Land acquisition process is almost completed and some more land is yet to be acquired" he said.

Mr. Somanath said the space agency was under discussion about the launch of the next-generation launch vehicle (NGLV).

"Now is not the right time to discuss it. It is a rocket which we want to be a recoverable stage, and basically [we are] working on liquid and semi-cryogenic technology," he said.

"We would like to make it much heavier than the current launchers, and the cost can also be substantially lower. We are working on various architecture across centres and are talking with industries to take part along with us," he said.

To a query about the launch of a navigation satellite on-board a GSLV rocket on May 29, unlike a PSLV used for IRNSS-1 navigation satellite missions, he said navigation satellites are heavier and cannot be launched using a PSLV and they would be launched using GSLV rockets.

On whether the services enabled by the navigation satellite launched on May 29 would be available to civilian users, he said ISRO was not given the authorisation for L1 and S bands for civilian services (earlier).

"When the remaining satellites are launched [after Monday's mission], I am sure all of your mobile phones can be compatible [for usage of the satnav facility]", he said.

Following today's successful GSLV-F12 mission, ISRO has planned to launch more navigation satellites in the near future.
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Re: Indian Space Program: News & Discussion

Post by sanman »

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Re: Indian Space Program: News & Discussion

Post by sanman »

GSLV-F12, China's first civilian astronaut, China's manned lunar program

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Re: Indian Space Program: News & Discussion

Post by Amber G. »

^^^ Wrt to SRO launch of its advanced navigation satellite GSLV-F12 and NVS-01.. I think Rahulm and others may have mentioned it..

For the first time, an indigenously developed rubidium atomic clock has been used as the scientists earlier opted for imported ones

India is strengthening its navigation system.
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Re: Indian Space Program: News & Discussion

Post by Varoon Shekhar »

Amber G. wrote:^^^ Wrt to SRO launch of its advanced navigation satellite GSLV-F12 and NVS-01.. I think Rahulm and others may have mentioned it..

For the first time, an indigenously developed rubidium atomic clock has been used as the scientists earlier opted for imported ones

India is strengthening its navigation system.
Right, and they also mentioned something about magnetic levitating reaction wheels. Would those be indigenously developed? And how much of a breakthrough would they be?
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Re: Indian Space Program: News & Discussion

Post by SSridhar »

Varoon Shekhar wrote: Would those be indigenously developed? And how much of a breakthrough would they be?
Yes, they are indigenously developed by the ISU (Inertial Systems Unit) of ISRO. Magnetic levitation is magnetic bearing instead of roller or ball or fluid bearings in Reaction Wheels which control the attitude of the satellite. They are the next level in ensuring reliability and longer-life of the Reaction Wheels. This is a first for ISRO while others have used them for a few years now.
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Re: Indian Space Program: News & Discussion

Post by sanman »

Varoon Shekhar wrote: Right, and they also mentioned something about magnetic levitating reaction wheels. Would those be indigenously developed? And how much of a breakthrough would they be?
Reaction wheels have to keep spinning continually, so that means their bearings can wear out due to friction.
Maglev would mean frictionless magnetic bearings which don't wear out.

Reaction wheels are of course essential for spacecraft to maintain a desired orientation.
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Re: Indian Space Program: News & Discussion

Post by vrbarreto »

Past and future launches are available here:

https://www.youtube.com/@TheLaunchPad

The live chat is quite interesting, especially the racist and jealous rantings of those emanating from a past colonial oppressor, most are deleted, some remain.

Watched the launch yesterday live with the family. It was exciting. I would wish though that they would get some better cameras to cover the launches.
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Re: Indian Space Program: News & Discussion

Post by Amber G. »

Varoon Shekhar wrote:
Amber G. wrote:^^^ Wrt to SRO launch of its advanced navigation satellite GSLV-F12 and NVS-01.. I think Rahulm and others may have mentioned it..

For the first time, an indigenously developed rubidium atomic clock has been used as the scientists earlier opted for imported ones

India is strengthening its navigation system.
Right, and they also mentioned something about magnetic levitating reaction wheels. Would those be indigenously developed? And how much of a breakthrough would they be?
To add / summarize :

Magnetic levitating reaction wheels, also known as maglev reaction wheels, are a type of attitude control device used in spacecraft to control and maintain the orientation (or attitude) of the spacecraft. Traditional reaction wheels use mechanical bearings to spin a flywheel, which generates a torque to control the spacecraft's attitude. In contrast, maglev reaction wheels use magnetic levitation to suspend the flywheel, eliminating the need for mechanical bearings.

ISRO has been involved in the development and use of maglev reaction wheels for their spacecraft missions. They have implemented this technology in their satellites to improve their attitude control capabilities. Maglev reaction wheels offer several advantages over traditional reaction wheels, including reduced friction, increased lifespan, and improved reliability.

By utilizing magnetic levitation, these reaction wheels reduce the mechanical wear and tear associated with traditional bearings, which can lead to failures over time. This technology also offers higher precision in attitude control, allowing for more precise maneuvering and stabilization of the spacecraft.

From what I remember ( I have not checked the current specs) for ISRO, a typical maglev flywheel has about 10-20 faster spin (about 100,000+ RPM) then traditional flywheel generating better torque.

The use of maglev reaction wheels by ISRO is aimed at enhancing the performance and longevity of their satellites. These wheels contribute to improved stability and accuracy in maintaining the desired orientation of the spacecraft, enabling better imaging, communication, and other mission objectives.

While maglev reaction wheels offer several advantages, they can be sensitive to external magnetic fields, require precise control systems, and can be more complex and expensive to develop and maintain compared to traditional reaction wheels.

More than anything else, IMO, ISRO's use of maglev reaction wheels demonstrates their commitment and capability to advancing spacecraft technology and improving the performance of their missions.
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Re: Indian Space Program: News & Discussion

Post by Varoon Shekhar »

"To add / summarize :

Magnetic levitating reaction wheels, also known as maglev reaction wheels, are a type of attitude control device used in spacecraft to control and maintain the orientation (or attitude) of the spacecraft. Traditional reaction wheels use mechanical bearings to spin a flywheel, which generates a torque to control the spacecraft's attitude. In contrast, maglev reaction wheels use magnetic levitation to suspend the flywheel, eliminating the need for mechanical bearings.

ISRO has been involved in the development and use of maglev reaction wheels for their spacecraft missions. They have implemented this technology in their "

Thank you Amber! I hope in the days to come, there is additional information coming out, about what all was achieved in this recent mission. T.S Subramanian used to write excellent articles in "Frontline" magazine on ISRO launches. Let's see if he still does.
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Re: Indian Space Program: News & Discussion

Post by Amber G. »

SSridhar wrote:
Varoon Shekhar wrote: Would those be indigenously developed? And how much of a breakthrough would they be?
Yes, they are indigenously developed by the ISU (Inertial Systems Unit) of ISRO. Magnetic levitation is magnetic bearing instead of roller or ball or fluid bearings in Reaction Wheels which control the attitude of the satellite. They are the next level in ensuring reliability and longer-life of the Reaction Wheels. This is a first for ISRO while others have used them for a few years now.
Thanks. My knowledge of ISU/ISRO's development is not current and obviously ISRO has not publicly disclosed much specific details in the past .. but it is no surprise ..they have made significant strides with a strong focus on developing home-grown technologies in this and a few other technologies.

It fits well with the history of developing various critical components and subsystems in-house.. eg spacecraft propulsion systems, guidance systems, and onboard electronics to mention just a few. Would be interesting to learn more details from their official documents. Everybody knew for sure that ISRO has been seriously developing these types of reaction wheels / (and other inertial guidance system components)... Kudos to them.
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