2 weeks back a prototype of Nasa’s 10 electric engine UAV Greased Lightning GL-10 made a successful test flight.
It is an unmanned hybrid-electric aircraft that can swivel its wings and engines — into the vertical position for vertical takeoff and landing (VTOL), and then horizontal for conventional flight.

A tethered test from last August

The fairly recent advent of electric propulsion — thanks in large to the growing power and energy density of batteries — allows for some very efficient hybrid-electric aircraft designs that could finally replace the current (massively inefficient) king of VTOL: the helicopter.

Here’s a video of the preparation and flight: