UlanBatori wrote:Gee! The Thought Polis are out in force, time to exit to caves. Might as well tell us to shut brain off and use narrow-vision blinders. Back to watching Republic TV blabber, thanks very much. The Moon looks soooooo pretty, no?
No one has policed anything = just discuss this in another appropriate thread suddenly becomes thought police.
OK, sorry i left without any trouble, but now I do have to make a brief comment on this gratuitous pissiks-dhaga-type rudeness:
Ion engines / continuous thrusters are relevant to lunar missions because they are the smart way to get to the Moon and GEO for unmanned missions where there is no hurry. Some of the complex maneuvers that Haridasji cited, are because the burns are not really bursts at the perigee, but longer burns of an engine using smaller thrust. Extending this gives the continuous-thrust trajectories, and I gave the simple theoretical answer on how to calculate the mission parameters for continuous thrust.
Look at recent ESA missions to GEO for instance. The overall mass ratio of the mission can be improved, so larger and more useful payloads can be carried on smaller rockets. This is of interest to people who think ahead about what the Chandrayaan missions imply for the Indian Space program, not just parrot what is in some manual. It will become deeply interesting as China builds up a Moon base.
If you calculate the payload of Chandrayaan-2, it is almost exactly at the limit for what the GSLV-3 can carry. To carry larger loads, such as for a sample-return mission, should one wait for a much bigger rocket, or become smarter and use continuous-thrust trajectories? You cannot allow anyone a but of space to even mention such a speculation in the context of the present mission?
Just curious: Is the culture inside ISRO still really that bad? Many years ago I was told that no one in India had any interest in hydrogen propulsion, since ISRO was interested in saalid raackit onlee, so go away to some other "appropriate" country to learn about hydrogen. Looks like the same culture has persisted. Eventually the cryogenic engines appear to have been developed after trying very hard to shoot the nation in the musharraf with the Nambi Narayanan case, idiot politicians and polis etc.
If I want to go post chest-thumping about ion engines, I will do so, thank you very much: no need for bullies to push me there. I have not tried to derail any thread, or tried to bully anyone: I simply answered a question. Ordering me to go elsewhere to an "appropriate thread" because you are ignorant of the significance of many things outside of some memorized manuals, is completely uncalled-for. I know this is a sort-of tradition of the Military Forum where some appear to believe they are conquering herrows to give military orders. Sad.