Related Clues:

• Sound made by helicopter rotors
• Sound beginning when hummingbird is rapidly returning
• Dishwasher sound
• Electric fan sound
• Noise of rapid movement
• At the start West Ham is really revelling in noise made by fans?
• Blender blade's sound
• Helicopter rotor sound
• Noise woke husband in real rage initially
• Drone from a drone
• Sound of rapid vibration
• Sound at a drone race
• Sound of something going round
• Where in Lancashire fans make such a noise?
• The kind of sound made by a propeller or an insect’s wings