Pyrotechnics whistle noise

Pyrotechnic compositions which are capable of producing a whistling noise are very sensitive and hazardous to handle. 

Two basic audible effects are produced by explosive and pyrotechnic devices a loud explosive noise (called a "report" or "salute" in the fireworks industry) and a whistling sound. 

Pyrotechnic compositions can produce two types of noise a loud explosive bang or a whistle. The explosive bang is achieved by placing a... 

With the possible exception of delay fuses, any pyrotechnic mixture represents a hazard worthy of report. Although the cause of frequent accidents reviewed in [2], compositions intended to explode or deflagrate are generally outside the field of this work and few are listed. Numerous reviews and specialist texts exist and hundreds of patents appear yearly. The account [1] of the theory and practice of pyrotechnics contains much useful information on the performance and potential hazards of a great variety of oxidant—fuel combinations which bum very rapidly or explosively. Safety measures are found in [2]. Other reviews written from a functional viewpoint are found in [3] and [4]. Some hazardously incompatible pyrotechnic mixes are reported [5]. Detonability of pyrotechnic compositions has been studied. Whistles and chlorate or perchlorate aluminium containing noise compositions often show detonability. Most others do not [6]. 

Two basic audible effects are produced by pyrotechnic devices a loud explosive noise and a whistling sound. In the terminology for noise effects, the sound effect itself is a report. The device that prodnces a report in the fireworks industry is a salute, and in the military it is a simulator. The typical composition used to produce a report, whether in civilian or military applications, is an oxidizer-metal mixture that is termed a flash powder. 

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