Indian Space Program: News & Discussions

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Sathya said:
Over performance leads to gain or loss?
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Over-performance is usually a positive sign. Over-performance of one stage (in this case the C-25 stage) leaves the next stage with more energy (KE &/or altitude) to perform maneuvers. So, if the C-25 over-performs, each of the payload stage maneuvers would require less fuel. Thus, the payload can be maneuvered a greater number of times.

In this mission you are releasing 36 fairly large satellites one after the other. To avoid any collisions, you have to perform at least one precise maneuver before releasing a satellite. If your payload stage can perform more than 36 maneuvers, you have a greater margin of error. Thus, your chances of having a fully successful mission increase.
 
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From /isro at reddit.
 
Some onboard camera footage of the recent LVM3 M2 / OneWeb India-1 launch:

LVM3 M2 / OneWeb India-1 Mission

Some good quality launch/integration photos on the ISRO website: LVM3 M2 / OneWeb India-1 Gallery

Apparently, this is the reason why we had launched only 36 satellites:

https://twitter.com/x/status/1584861291860340736

Apparently OneWeb wanted to launch more satellites. The satellite dispenser design is OneWeb's responsibility, so not ISRO's problem.

Also, it seems ISRO has prioritized the 2nd OneWeb launch over the Chandrayaan-3 mission. The LMV-3 M3 mission was previously meant for the Chandrayaan-3 & the M4 mission would be for the next lot of 36 OneWeb satellites. Now it seems that has been reversed.

The CE-20 engine for the M3 mission recently went through an acceptance test:

CE20 Cryogenic Engine for the next mission of LVM 3 tested for acceptance
 
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Finally, a semi-cryogenic engine update; we are almost ready to declare success.
LINK - SC120 going to be validated soon

  1. Induction of the high propulsive SC120, along with increased propellant loading of the cryogenic upper stage (CUS) can enhance this to six tonnes (GTO) and 10 tonnes (LEO).
  2. semi-cryo stage that will replace the L110…
  3. Qualification tests are in progress. Stage and engine development phase is complete and the test stand is getting ready for carrying out tests carrying out tests. At present sub-system level tests are going on at testing facilities in Mahendragi and LPSC
  4. We are expecting qualification to be completed in a couple of months unless some anomalies are found which may call for repeated tests, which are not unusual during the evolution stage,
 
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Indx TechS said:
Structural changes were supposed to boost payload too. So excluding SC120 and including only C32 pegs payload at 4850 kg to GTO.
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The C32 was delivered by HAL a long time ago; I'm not sure if we have used it in the lunch vehicle or not. The main test is the SCE 200 engine; once we complete it, we will complete all stages of current-generation engine development. Next, we should work on clustering and autonomous landing; the Methalox engine can be developed in parallel; we have plenty of time.
 
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