Bharat Rakshak

disha

https://www.google.com/amp/s/www.scientificamerican.com/article/chandrayaan-3-makes-historic-touchdown-on-the-moon/%3famp=true Finally, on touchdown, sensors on the lander’s legs triggered the shutdown of its main engines. Chandrayaan-3 now stands tall on the moon . the above is from a scientific a...

disha

Ashokk wrote: ↑25 Aug 2023 13:57 Sushant Sareen gives it back to the UK

^Excellent response by Sushant Sareen. I am forwarding that clip to some of my ex-colleagues.

disha

Even though I can't understand half of Dishaji and AmberGs posts on math, space and medicine, I propose.... Can we just appoint AmberG as BRs Bill Nye, the Science Guy ( or should it be, gal?). AmberG, is BR's Scienceji. There. That's proper desi and even rhymes. Screw Bill Nye. Hey CainJi, thanks....

disha

Engines cutoff a meter of two above the surface seems excessive in my opinion especially if there is a possibility of a bounce( in low lunar gravity) with uneven time of touchdown (due to uneven weight distribution of the LM) of the each of the four legs. Thx for doing the calculations. The engines...

disha

Would we be able to repurpose the SHAPE instrument for analyzing any other planet if all of the habitable planet earth planned experiments are completed as someone else asked? In other words what advantages can be derived from the extended life of the PM? Also if you have both CH-2 and PM in large ...

disha

I've few questions popped in my mind after this landing. 1. With lunar gravity very low, returning to earth should consume much less thrust. What would be the ratio , is it 1:100? 2. Entering back to earth, how much thrust ratio needed compared to escaping the earth's gravity, my understanding is h...

disha

Great news and an amazing video! Love the pop-up the Astra does once is clears the aircraft While the 400 missile order is a good start, its nowhere near enough to confront 2 adversaries. Just for comparison, beggar Pakis have stockpiled 500 AIMs Hope the IAF is not waiting for Astra-Mk2. Need a ma...

disha

Roop wrote: ↑24 Aug 2023 06:09 Is that true, though? I thought the Americans had a Viking lander there. Maybe I'm mistaken. Amber / SSS, any comments?

Roop'ji, please do a simple google search.

disha

I hope India continues to build on this work, sending bigger and more robust landers to the lunar surface, transporting higher-mass payloads including bigger and more robust rovers, which can carry out more robust lunar surface exploration and discoveries. +72. The lander is going to return, right?...

disha

I thought Change e was a showcase of autonomous systems and communication relays. I really wonder about the algorithms and data fusion of Vikram to steer the craft so wonderfully. I wonder if it is world class. In which case one can anticipate demand for collaborations. Here are my notes on the Aut...

disha

Waiting for the video of the Rover, that is when I am going to lose it :) Why wait saar! Pragyaan is like a baby taking its first tentative steps. It will look only cute when it walks on the moon. The feeling of exhilaration on a tough mission accomplished successfully, yes 99.9% of the mission com...

disha

CNN (not IBN but the Amrikan wala channel) had this ex NASA astronaut and professor in their studios to talk about Indian moon landing and he was saying that no one attempted to land on the south pole so far because no body thought it was feasible . But in 2019 we almost did it and that should have...

disha

Cyrano wrote: ↑23 Aug 2023 23:17 Unfortunately our DD camera crew isn't deployed on the moon saar. Perhaps thats a good thing

They need to be deployed on the far side of the moon.

disha

Why the Rover roll out is so hush hush? At this point, Rover is bonus. Yes, it needs to race to the nearest crater and find ice and minerals and claim that crater for India and Humanity. But 99% of the complexity of the mission has been overcome. What rover will face will be engineering challenges.

disha

... BIggest thing they are probably looking at pictures in front of the lander Vikram and whether it has clear space to roll out a ramp so PRagyaan can come out smoothly. (My speculation: if this is not possible and there is boulder in front of Vikram, the 'hop' of the lander that people were specu...

disha

First image from Vikram of the Moon's surface following the landing: https://pbs.twimg.com/media/F4OUkKVa8AEtHsA?format=jpg&name=medium Beautiful. And thanks! ~8M live stream viewers for C3 landing :eek: and now the current viewership of C3 landing is ~40M. It will easily cross ~50M by end of t...

disha

Maybe they were hedging against a negative event and didn't want to do an ultra-zoom on what could have been a disaster. All in all, job well done. Brilliant people, lots of hard work. Hopefully, India will make this routine. Things can go wrong any time. In the rough breaking phase, fine breaking ...

disha

I for one am glad that it has happened now. My father, born in India under the rule of a foreign power wished to return there in his retirement. Sadly it was not to be. My mother was likewise determined to return but after father's death she came to the UK to be near her four sons. Next Tuesday is ...

disha

Last few seconds DD switched to some close up shot and we could not see real time Hv, Vv and Alt data. Hope DD does a better job when we see the next landings on Mars and Venus. The ISRO official youtube channel did similar - switched to PM Modi in the last 30 seconds or so of the landing. This is ...

disha

Congratulations India/ISRO -------------------------------------------------------------- I mentioned this few pages back: What we must not miss is that we are standing at an epochal movement. A major transition is happening right in front of our eyes. And a massive generational shift. We are witne...

disha

Disha What time is the landing in California time? Live telecast will begin at * US 4:50 AM PDT (California), 7:50 AM EDT (New York). * AUS 9:50 PM Sydney NSW * IST 5:20 PM (India) Link for live telecast below: https://www.isro.gov.in/LIVE_telecast_of_Soft_landing.html ETA for touchdown is ~ 5:34 A...

disha

sanman wrote: ↑23 Aug 2023 06:49 Useful description of the landing procedure:

Cannot believe a day will come when doorknob will be quoted in C3 (or a specific deep space mission) for value of the content of his show!

India has indeed crossed a rubicon! In a very very good way.

disha

chetak wrote: ↑14 Aug 2023 19:53 disha ji,

https://indianexpress.com/article/polit ... f-8892255/

Chetak'ji. Thx for the link. Above is a keeper.

disha

This case has more issues which are not clearly exposed. 1. CMRL was the company who was charged for violating tax norms. The Interim Board for Settlement under the Central Board of Taxes had found serious discrepancies in the financial statement of CMRL. So they had to give a statement explaining ...

disha

how are the modules uncoupled mechanically ? electro mechanical latches? explosive bolts ? ?? I think Ashok'ji or someone posted the information on how C3 separates. It is spring based, the lander is latched to the propulsion module and are cut using bolt cutters. I was wrong in my initial assessme...

disha

SSS and other gurus, i was looking at dry mass and wet mass of CY-3, looks like there might be fuel left in PM, how i wish ISRO surprises us with Vikram taking off mating with PM and coming back to earth and crash burning. Hope CY-4 is already being planned for to-fro trip Vikram cannot mate back w...

disha

First of all thanks Ashok'ji for the informative links that confirmed the separation of C3PM from Lander was enabled by a spring and a latch. Something like this bolt cutters https://psemc.com/products/pyrotechnic-bolt-rod-cutter/ Thanks everyone for posting photos from various sites like ISRO's X/T...

disha

Thanks Ashokk'ji for the link and more clear presentation recording. And yes, the slides are better now. Pulling this up in the top page shortly.

Link to this presentation on C3 by ISRO chairman

Ashokk wrote: ↑18 Aug 2023 23:27 https://www.facebook.com/DishaBharat/vi ... 3631401782

disha

... Just a quick question it would still have taken a significant effort to reorient the PM+LM right? Though the larger PM engines would be better placed to accomplish that? ... Najunamar'ji, all satellites are falling bodies and hence are weightless. It does not take much energy to re-orient the f...

disha

how are the two modules pushed apart ? springs? thrusters ? It need not be springs. I think it is a cold gas thrust from the propulsion module to the lander module. The way lander is staged on the propulsion module a strong puff of gas (generally liquid nitrogen as generator) to safely push the lan...

disha

For that there is a separate fixed frequency beacon used exclusively by satellite operator in conjunction with Ranging equipment using Tx/Rx for accurate measurements ) Also, laser-ranging through laser retro-reflectors affixed on spacecraft. Don't know if CY3 carries any. The laser-ranging through...

disha

chetak wrote: ↑13 Aug 2023 23:23 <news image indicating T- Veena of daughter of Kerala CM Pinarayi Vijayan got ~1.72 crore for services not provided>

Chetak' Saar, which services were requested and not provided?

disha

Given the proximity of the two sites, I hope this is not some Chinese-inspired plan to show up there first and somehow jam CY3 communications during the crucial landing phase. Not sure if it is feasible to even load any such equipment into a small lander/rover, but I can't help "thinking the u...

disha

... Location of Russian craft LUNA25 landing site ( Indicated as TEST_PLACE ) as on 21st August. It is in sunlight so craft can be set there ( although it is not necessary ... It has a nuclear powerpack so it can work for months without sunlight [ my guess] ) on 21st before CH3 scheduled for 23rd. ...

disha

quote="Prem Kumar" post_id=2597262 time=1691757340 user_id=15621] I was told that LOX+Kerosene semi-cryo is basically a WW2 concept, though a lot of tech-development has happened since then. I fully agree that at a much larger scale (100X that of Agnikul), there will be a host of other pro...

disha

^^^ ISRO's semi cryo is staged combustion cycle, which is far more difficult to master. Agnikul might be using gas generator I guess. Their chamber pressure is only 10 bar Arvinji, yes scale is different. As you correctly point out, agnikul is a baby engine. The chamber pressure of CE7.5 (GSLV Mk2 ...

disha

Disha: it beats me why ISRO is taking so much time to master semi-cryo. Agnikul (the space startup) is using semi-cryo engines for their 1st and 2nd stages. Agnikul is yet to launch, but their basic design and initial tests are done. If they can do it, why not ISRO? Its the scale. What Agnikul is d...

disha

Have we already seen this video? https://www.youtube.com/watch?v=gGv4qpSSl3w Yes. This is linked I believe in the second or third page. Following that there was some discussion on C2 failures and then the lecture at IISc which has very very good details. It will take time to unspool and discuss tho...

disha

^Sanman'ji, Well we will wish Ruskies the best. South pole is not going away and yes there are always bragging rights on who reached to moon first and who reached to south pole first, it all boils down to successful exploitation of Moon's resources for upliftment of Indians & humanity. There are...

disha

< GareebScientist vlog > Thanks Sanman'ji for the vlog from GareebScientist. Overall he does a good job, but he needs to start following BRF and can start taking more detailed and thorough analysis from BRF to improve is vlog. I remember his line of questioning to ISRO chairman last time during the...

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