Why 777X’s wing changes are key to new twinjet’s performance

[Ref Flight International Magazine 4-10 Feb 2020]

With all-new carbonfibre wing, incorporating folding wingtip, the Boeing 777X is slightly different from previous iterations of the twin jet.

The Boeing 777X remains full airport compatibility as the wingspan reduces to 64.8m when folded, but once it is extended, the span is increased by 7m (23ft) over the 777-300ER, to 71.8m.

Boeing describes the 777X wing as a “4th generation composite” design, incorporating an “advanced high-lift” ­system

Both generations have inboard double-slotted and outboard ­single-slotted flaps. But on the 777X the outboard section is made up of two sections, rather than one on the earlier generation. This means that the number of outboard actuator/canoe fairings has doubled from two to four (or two per flap section).

The inboard flaps on the 777X have greater span than the ­original version. As a result, the flaperon (installed between the ­inboard and outboard flaps) has moved further outboard into the more swept part of the wing ­trailing edge.

Leave a Reply

Your email address will not be published. Required fields are marked *