Comments by "红火树 RedFireTree" (@firetree2007) on "India aims for the moon again: ISRO says Chandrayaan 3 good to go | India News | WION" video.
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1. India likes to boast its mars probe, what they do not know is all the navigation and instructions was from NASA not by ISRO.
2. China has done many times walk on the moon, and even at the back of the moon, recently NASA asked China's permission to use China satellite placed at the back space of the moon, China has agreed despite the US refuse to let China use International space station
3. for the reason why 2 is crashed is that all landing on the moon was done by the lander itself, no human control from the earth, so unlike mars probe (only 14.3 kg compare to China mars package with total 5000 kg) US cannot help
4. for the moon lander its needs all kinds of sensors to accurately measure the distance, and position, India with very little experience on that.
5. For China's moon lander, with 3.8 tons, China use a main engine that can be throttled from 1.5 to 7.5 Kilonewtons to conduct a single continuous landing burn, so basically, for 3.8 ton lander, the engine can provide 2 times of the power, 7.5 tons, India Lander Module (Vikram): 1752 kg including Rover (Pragyan) of 26 kg, with about 2 tons, with 4 800 kg power engine, about 1.5 times of the weight.
India cannot make changeable throttle engine, for Chandrayaan 2, it used 5 small engines, did not work, crashed, for Chandrayaan 3 it reduced one, so only 4 engines, but the principle does not change at all, so it has high possibility of crash again.
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