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Old 15th Nov 2018, 19:39
  #1284 (permalink)  
Join Date: Mar 2010
Location: L.A.
Age: 53
Posts: 576
Originally Posted by sAx_R54 View Post
Have been wondering what effect larger engine nacelles might have on MAC and/or CoG, when moved further forward on the airframe.....!
Another problem with these larger engines, is that they are more powerful, and I presume their center of thrust is lower on the airframe (because of the larger N1 fan diameter). Both of which result in a greater nose up moment when at full power, and therefore a greater risk of overpowering the elevator and leading to an uncontrolled pitch up. And therefore requiring a MCAS system to prevent this. Which was not fully thought through, and led to unforseen secondary failure modes.

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