Featured Image: [In The] the early 1480s, . . . Leonardo da Vinci created a design for a machine that could be described as an “aerial screw”, that any recorded advancement was made towards vertical flight. His notes suggested that he built small flying models, but there were no indications for any provision to stop the rotor from making the craft rotate.[14
Source: Wikipedia Commons (Public Domain).
From IEEE Spectrum By Lyle Chamberlain & Sebastian Scherer
We’re standing on the edge of the hot Arizona tarmac, radio in hand, holding our breath as the helicopter passes 50 meters overhead. We watch as the precious sensor on its blunt nose scans every detail of the area, the test pilot and engineer looking down with coolly professional curiosity as they wait for the helicopter to decide where to land. They’re just onboard observers. The helicopter itself is in charge here.
Traveling at 40 knots, it banks to the right. We smile: The aircraft has made its decision, probably setting up to do a U-turn and land on a nearby clear area. Suddenly, the pilot’s voice crackles over the radio: “I have it!” That means he’s pushing the button that disables the automatic controls, switching back to manual flight. Our smiles fade. “The aircraft turned right,” the pilot explains, “but the test card said it would turn left.” . . . Read Complete Report