Nothing to add except the wing itself. The 777-X has better lift than any other existing Aircraft...
Interesting comment. What evidence makes you say that?
I'd sort of hope that the 575 tonne A380 has better lift …..
The 73 meters / 238 ft 10 in wingspan
and the behavior of the aircraft is sufficient evidence...
And that the engines have a 115,000lbs thrust like the 777-300ER is another evidence while the aircraft is 3 meters longer for the Triple-7-9
Plane Wing_aspect_ratio Wing_loading (kg/m^2)
777x 9.96 680
A380 7.53 680 kg/m^2
A35K 9.03 680
A359 9.49 633
787-9/10 9.59 673
77W 9.04 795
A330NEO 8.8 540
A333 10.06 698
As increased aspect ratio allows better underside laminar flow as well as the calculated efficiency from wingtip vortices.
The A330NEO extended wing is an interesting compromise. Heavy, but good numbers, except the great aspect ratio of the A333 was intentionally thrown away for wing area. A mid-length mission compromise.
The A359 has low wing loading and good aspect ratio, but not as good as 787 or 777x.
The 787 is extreamely competitive, but the A359 is slightly better at the extreames of payload/range.
The 777x has great aspect ratio. It should be a little more efficient. But wing loading is only in family with modern Aircraft.
The A380 has a stubby wing. For prior generation Aircraft, great wing loading, but efficiency reduced due to the stubby wing and lack of modern wingtip treatement.
So between advancement of underside laminar flow and improved aspect ratio, the 777x should have better L/D.
What will matter is the GE9x. The engine is a full generation ahead of TrentXWB: (data from Wikipedia):
1. CMC inlet vanes (fixed) to high turbine
2. Variable turnine cooling (developed for LEAP)
3. More turbine clearance control circuits (more efficient turbines). Tightest control loops for thermal control I've yet seen.
4. Pressure ratio 60:1 vs. Txwb"s 50:1
5. Slightly improved bypass ratio: 10:1 vs. Tcwb's 9.6:1.
Put into perspective, the vaunted GE-90-115 has a pressure ratio of 42:1 and bypass ratio of 9:1. The A380 Trents pressure ratio 39:1, bypass ratio 8.7. The high internal friction of 4 engines vs. 2 engines rears its ugly head.
So the wing is a little better than the A350 or 787, far better than the A380. It will be engines and subsystems that determine the most competitive designs and the 777x is a nice technological leap forward over the 777-300ER. We all know how the A380 vs. 77W competition went.
In reality, the 779 is very dependent upon the engines. I believe they will deliver. The wing improvement was the minimum to motivate GE to develop this engine. As the larger the engine, the better the ratio of flow area to surface area (less friction losses per unit of thrust).
I believe the 779 and, in the future a 777F, will do very well. Congrats on 1st flight.
Winter is coming.