Here are three playful ways to say it:
- The helicopter's big spinning blades are like a giant fan on top. They push air so the helicopter can lift off, stay still in the sky like a dragonfly, or fly any way it wants.
- Imagine the rotor is a magic umbrella that spins. It blows air down to make the helicopter float up, hover like a hummingbird, or move forwards, backwards, or sideways.
- The rotor is like a super-fast spinning top on the helicopter's roof. It helps the helicopter rise, hang in one spot like a busy bee, or zoom around in the air like a toy car.