Check out the double-rotor helicopter that could be the US Army’s next Black Hawk
The Defiant X employs two coaxial rotors up top, with a propeller in the back...
The Defiant X employs two coaxial rotors up top, with a propeller in the back...
The LisHawk. (Enrico Ajanic, EPFL/)Drones are common enough that it’s easy to picture their basic...