We will spend this article on the 777X engines, the GE9X from GE Aviation. Surprisingly, these are less powerful than the GE90 engines on the Boeing 777-300ER, the aircraft the 777X is derived from, despite the 777-9 being larger and heavier than the -300ER. This is with intent. The design of the 777X is to achieve more with less. We reveal how this is done below.
The Boeing 777-9 is larger and heavier than the 777 variant it replaces, the Boeing 777-300ER.
Despite this, the GE9X engines on the 777-9 are specified with 10,00lbf lower maximum thrust than the GE90-115 on the 777-300ER.