Small drone without exposed rotor blades suited for use in tight, hazardous spaces By Jim Magill Looking like a micro-sized version of the Death Star, the Dronut X1, which Boston-based start-up Cleo Robotics released for commercial use earlier this month, is the first professional-grade bi-rotor ducted-fan drone - a drone without exposed rotor blades - built to conduct … [Read more...] about Drone Without Exposed Rotor Blades: the Dronut is Perfect for Small, Hazardous Spaces