NASA engineers have given NASA's Mars helicopter keeps exceeding expectations: Ingenuity completed its fourth flight on Friday, traveling farther over the Martian surface than on any of its previous journeys. NASA engineers were prepared for the 4-pound helicopter to crash, since they're pushing it to new limits with each flight. But in this case, the tiny rotorcraft soared above rocks, sand ripples, and small craters at record speed. NASA hasn't released details of the flight yet, but the plan called for Ingenuity to climb 16 feet in the air and reach a maximum speed of 3.5 meters per second - a feat NASA engineers weren't certain it could achieve.