Comments by "红火树 RedFireTree" (@firetree2007) on "Viral: Chandrayaan-3 Recorded From Plane Window; Netizens Marvel At India's Milestone" video.

  1. Descent propulsion system for the USA Apollo, China's Changer and Chandrayaan 3, 1. USA Apollo, single engine, big, using helium gas as pressure source to push fuels and oxygen into engine to burn, by human control the throttle. 2. China, Changer, single engine, big, 1.5 -7.5 tons adjustable thrust for a 3.8 tons lander, use computer to control stepper motor to squeeze the fuel and oxygen into engine, the push can be continuous and stop and start multiple times, very accurate and with quick response time. 3. India Chandrayaan, using helium gas as pressure source to push fuels and oxygen into engine to burn, 4 small engines (800 kg thrust each) share common tank for fuel and oxygen, with step valves (20% each for Chandrayaan 2, and 10% each for Chandrayaan 3), no human control. with rough control and slow response. total weight of the lander about 2 tons. by comparing all 3 Descent propulsion systems, there is 80% chance that Chandrayaan 3 will be end like 2.
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  2. India ISRO is gambling with Chandrayaan 3, success or not is dependent on luck, not by science. it has not mastered the techs needed on accurate controlled soft landing.
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  3.  @culturalpope  By comparing the Descent propulsion system for the USA Apollo, China's Changer and Chandrayaan 3, the conclusion is that by 80%, it will end like 2.
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  4. By comparing the Descent propulsion system for the USA Apollo, China's Changer and Chandrayaan 3, the conclusion is that by 80%, it will end like 2.
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