I was wondering if there was an optimal law for the thrust (magnitude and direction) during the lunar ascent. I have read many things about this topic in this forum but I still have some doubts. It should be a linear steering law, but what are the values ​​of the constants? What is the actual guidance law used in Apollo 11 for? There is no non-linear parameterization fot the thrust angle that also changes according to the direction of the velocity of LM?

  • $\begingroup$ NASA's technical archive: ntrs.nasa.gov $\endgroup$
    – Hobbes
    Commented Feb 14, 2019 at 15:57
  • $\begingroup$ It's basically a gravity turn after the initial climb to avoid terrain. I don't believe the ascent engine was throttleable. $\endgroup$
    – user20636
    Commented Feb 14, 2019 at 16:28
  • $\begingroup$ @JCRM Correct, the ascent engine didn't throttle. $\endgroup$ Commented Feb 14, 2019 at 17:12
  • $\begingroup$ Related: How does the Apollo LM ascent guidance program work? $\endgroup$ Commented Feb 14, 2019 at 17:13
  • $\begingroup$ Is it possible to talk directly with an user? In particular I would have some questions for @RussellBorogove because I just read his analysis of this problem. Thanks :) $\endgroup$ Commented Mar 3, 2019 at 17:17


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