Boeing 787 Dream liner has such flexible wings since they are made of carbon fiber material. That makes them stretchable more than any other plane’s wings. A high aspect ratio then magnifies this effect to make the wings appear curved. Since the wings dampens the load changes more effectively, what you feel in flight is reduced shaking. When the plane lands, the wings appear with a less tip clearance due to the fact that there is a reduction in the required in-built dihedral.
Impact on flight speed?
The impact that the curved wings have on performance of Boeing 787 Dream liner is negative, but not so pronounced. The wings provide some resistance to flight but the effect of this is at its weakest level.
For any given bending moment, the amount of bending recorded will be determined by three factors:
- The wing span which has to do with curvature of the wing
- Spar height such that the curvature growth is inversely proportional to the square of the spar height
- Spar material in which carbon material is usually elastic until rapture
At the end of the day, the important factor is how much material is there to carry the bending loads. In this case, the material’s yield stress is vital. If a material can tolerate more stress before becoming elastically deformed, less of it will be needed to cause a bending moment.