Sikorsky reported successful flight tests for its 115-pound, battery-powered twin prop-rotor unmanned aircraft.

Seen as showing promising potential in future Mars science work, the UAV can take off at any time, traverse obstacles, and ...

"In the air, it relies on a pair of contra-rotating coaxial rotors, controlled by a steering engine to adjust the forward direction, to control torque and force, ultimately achieving stable flight ...