From Aviation Week, volume 60 (1954) [combined snippets: Here are some examples from a Google Books search. One onomatopoeic word for the sound of whirling helicopter rotors is "chuf" or "chuff" (often repeated in sets of two or three syllables). Many times, blade slap noise has been mistaken for machine gun fireįinally, one can find many other onomatopoeic sounds here, for instance: This can be defined as the loud, sharp increase in rotor noise, at theīlade passing frequency, that is so characteristic of particular model Helicopters during some régimes of flight. of Sound and Vibration, 1966 (a more accurate technical term proposed by Yargs) which says that:īlade slap is the sharp increase in helicopter rotor noise, at theīlade passing frequency, that is characteristic of certain model Indeed, the "Helicopter sound is rather complex", as mentioned in Frequency Analysis of Helicopter Sound in the AS332 Super Puma, or in Helicopter blade slap, J. A more technical SE discussion at The sound of rotating helicopter blades. More technical terms exist for their different noises, depending on the of enngine, the manoeuvre, the number of blades, the flight "mode". While the "chop" root is loose, I like its similarity with the cut ("to chop"), and " chop chop", rooted in Cantonese, adopted by English seamen meaning "hurry, hurry". in Why do helicopters make the pulsing noise when they fly?.
they make the loud chopping noise that's so familiar (in This Is a Picture of the Sound a Helicopter Makes),.Why do helicopter blades make the choppy sound they do when they are spinning around at a constant speed?.It is sometimes called with the broad and somewhat loose terms "chop chop", choppy or chopping sound, see for instance: It appears that the different noises produced by helicopers can be pretty complex, and I could not foresee the OP would raise my interest on this topic.
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