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Are helicopters rotor blades on the top called propellers?

The answer is: no

Helicopters have rotor blades on the top. They are not called propellers. Propellers are used to propel an aircraft through the air and are typically found on airplanes and boats. Helicopter rotor blades are used to generate lift and control the aircraft's movement. They are designed to rotate in a specific direction and at a specific speed to create lift.