The clattering chuff-chuff of heli-borne troops filled the air. If these tones do not decrease in amplitude with increase in frequency then the helicopter will make the banging sound which is often called blade slap.įrom Ivan Smith, Come Break a Spear (1980) : These low frequency discrete frequency components are heard as the chuff-chuff of the helicopter. It is noticed that there is a significant content of low frequency discrete frequency sound in the helicopter recording which is absent in the road traffic noise (Fig. The little " chuff-chuff" Fairey Ultra Light Helicopter, now in Royal Navy colours, was flown on and off its transporter truck while being driven along the runway to simulate a ship's platform.įrom The Aeronautical Journal, volume 78 (1974) : Since then the chuf-chuf-chuf of the rotary wing has become familiar in Korea, in air mail and express schedules, in utility uses such as power line inspection and mapping flights and in passenger operations as well.įrom Aircraft, volume 20, (1958) : Then, on May 6, 1941, Sikorsky took the VS-300 aloft and stayed airborne for one hour, 32 minutes and 30 seconds, a new world record.
Sikorsky, of course, is the recognized "father" of the helicopter industry in the United States - an industry that has grown from his original VS-300 (first flown in September, 1939) to a field of 17 manufacturers turning out everything from tiny single-place ships to giant tandem-rotor craft accommodating 40 troops. 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".
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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