Airbus created a remote-controlled aircraft with flapping wingtips to see how much it could increase efficiency

Airbus' AlbatrossONE.
Airbus
Airbus created the AlbatrossONE, a small-scale remote-controlled aircraft with wingtips that can flap like a bird during turbulence to better handle the strong gusts of winds.
These hinged, flapping wingtips help reduce drag, therefore saving fuel and consequently decreasing carbon dioxide emissions.
Airbus has completed two flight tests of the AlbatrossONE, and the most recent test in July used wingtips that were 75% longer than the ones used during the initial tes