The main rotor is a crucial component of a helicopter, responsible for generating lift and enabling flight. It consists of several long blades that rotate around a central hub. As the blades spin, they create a difference in air pressure above and below them, allowing the helicopter to rise, hover, or move in different directions. The design and size of the main rotor can vary depending on the type of helicopter. For instance, larger helicopters like the Sikorsky UH-60 Black Hawk have wider rotors to support heavier loads, while smaller models like the Robinson R22 feature shorter blades for agility and efficiency.