There's a been a lot of back and forth in recent years about the risk drones pose to airplanes and the type of damage they could possibly cause if an impact were to occur, but little true research has been done. This video follows a research team that used an air cannon to fire a drone at an airplane wing to study the damage that occurred.
Coming to you from Aviation International News, this interesting video shows a research project that aims to investigate the sort of damage that a drone might cause to an aircraft. Whereas a lot of the focus has been on a possible collision with a large jetliner, smaller general aviation aircraft aren't always anywhere near as rugged and could possibly be at substantial risk if they were to experience an impact with a drone. As the researchers mention, their solution is to build drones to break into fragments in such situations to reduce the impact damage. Of course, that likely wouldn't please drone owners would wouldn't want their expensive equipment shattering in other more routine impacts, but if it were to prevent a major accident, I would certainly be all for it.