The first practical helicopter took off in 1939 in the United States, built by a Russian-born engineer named Igor Sikorsky. Earlier inventors had tried for centuries - even Leonardo da Vinci sketched a flying screw in the 1480s - but no one had solved the basic problem: when a rotor spins one way, the body of the machine wants to spin the other way.
Sikorsky’s design used a small tail rotor to counter that spin, and that layout is still the most common one today. The main rotor on top doesn’t just lift the helicopter. By tilting the angle of the blades slightly as they spin, the pilot can push the aircraft forward, backward, or sideways, or simply hold it perfectly still in the air.
Hovering is what makes helicopters truly special. They can land in tight clearings, on hospital roofs, on ship decks, or in mountain rescues where no airplane could go. The tip of a spinning rotor blade can move at close to the speed of sound, even when the helicopter itself isn’t moving at all.
