Aerodynamic Wing Tip Gives More Lift Without Lengthening Wing
The 767-400ER features highly back-swept (raked) wing-tip extensions that increase the 767's 156-foot wingspan to 170 feet, 4 inches (51.9 m) designed to increase the aerodynamic efficiency of the wing.
Another advantage of the raked wing-tip design is its simplicity. It is lightweight and bolts into place, with no additional design changes needed to the tip or leading edges of the 767-300 wing.
This efficiency of design and economy of structure affords the 767-400ER more gate and taxiway flexibility. It can use the same gates as the DC-10-30, MD-11 and L-1011, unlike the A330-200, which must use gates sized by the industry for large airplanes such as the 747 and 777.
The raked wing tip balances cruise efficiency and airplane weight to achieve improved range.