The monstrous new turbofan engine has countless new features ... GE9X's total weight lighter than the GE90. The gargantuan engine nacelle of the GE9X is 184 inches (4,700 mm) wide.

JetZero had previously said the demonstrator would be powered by twin PW2043 engines, having dropped an earlier plan to use P&W’s geared turbofan ... design and build nacelle structures ...