3 ms·

>Umm, a little confused here, if the center of gravity shifted forward, why will the pitch up tendency increase? Because the center of thrust is also moved for

• gsnedders 8y ago
  It's also a vastly longer aircraft than originally designed: the -100/-200 are 29m/30.53m long. The MAX 8 is 39.47m long. (And the MAX 10 will be 43.8m.)
• teleclimber 8y ago
  The center of thrust moving forward would not have any effect on the pitching moment.
  • aphextron 8y ago
    >The center of thrust moving forward would not have any effect on the pitching moment. Sure it would. Here's a better explanation than I care to make: https://www.quora.com/Where-should-the-center-of-mass-lift-and-thrust-be-on-a-jet https://www.quora.com/Where-should-the-center-of-mass-lift-a... "If the Center of Thrust does not act through the Center of Gravity there will be a moment causing the aircraft to pitch, yaw or roll about the axes of the aircraft and the moment(s) must be counter balanced by design (including provision for trimming when the thrust is varied)." Boeing chose to counteract that newly induced pitch moment with software, so that they could sell the MAX 8 to airlines as not requiring any new training or type ratings. And now nearly 400 people are dead because of a marketing decision.
    • teleclimber 8y ago
      If you move an engine forwards (or backwards) you are moving it along its thrust vector. Therefore the moment resulting from the distance between the thrust vector and the center of mass is unchanged. Source: Physics 101
      • AnimalMuppet 8y ago
        Right, but if you increase the power, you increase the moment.