Miami Jets 2020 Finale. [ RC Jets Turbine] Boeing 787 wings flex in flight, F-100 Sabre, Viper Jet

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The Miami Jets 2020 finale. The Boeing 787 model is so realistic that you can see the wings visibly flex in flight as it makes the turn. The wings of the Boeing 787 are so flexible because its carbon fiber material can be stretched more, and the high aspect ratio of 11 will magnify this effect. The full-scale B787 flex 14.16 feet above and 4.52 feet below the jig position.

The amount of bending for a given bending moment depends on three factors:
Wingspan: A given curvature of the wing due to bending at the wing root will cause a tip displacement which is proportional to the distance of that tip from the root.
Spar height: This curvature grows with the inverse of the square of the spar height. A lower relative thickness of the wing will produce more bending.
Spar material: The Young's modulus of the material describes how much it stretches for a given stress. More important, however, is the elastic elongation at yield stress. Carbon fiber has a higher Young's modulus than aluminum but is elastic until rupture, so it can be stretched more and produces more bending at yield stress.