The traditional Drones with propellers are harmful as they can cause cuts to humans and birds. Also, if the drones accidentally hit an obstacle, the delicate propellers can easily get damaged.
This Propellerless Drone concept gets rid of such risks and uses the #Dyson Bladeless Fan technology to not only become harmless but also sustainable, as it needs 40% less energy, could be up to 15 times more powerful and uses sustainable materials for several parts of the body.

A few links to related videos
#BladelessFan working    • Sir James Dyson explains his bladeles...  
Why Bladeless Fans are a Lie    • Why Bladeless Fans Are a Lie  
Latest #DroneTechnology    • Video  
Athletic Power of #Quadcopters    • The astounding athletic power of quad...  
Jetoptera's Bladeless Propulsion System    • Jetoptera's Bladeless Propulsion System