Everyone and their mother had been posting all these firework pics and vids, well, I just felt randy for knowledge, and maybe some of you will find this post to your liking... :) Happy Birthday USA! [BRIEF SCIENCE of PYROTECHNICS] Typical pyrotechnic formulations consist either of flammable materials such as nitrocellulose and/or black powder or a mixture of a fuel and oxidizer blended in situ. A plug placed at one end of the container with a small orifice, called a choke, constricts the expulsion of the ignited pyrotechnic compound, increasing the size and aggressiveness of the jet. Various ingredients may be added to pyrotechnic devices to provide colour, smoke, noise or sparks. Special additives and construction methods are used to modify the character of the effect produced, either to enhance or subdue the effect; for example, sandwiching layers of pyrotechnic compounds containing potassium perchlorate, sodium salicylate or sodium benzoate with layers that do not creates a fountain of sparks with an undulating whistle. Modern pyrotechnics are, in general, divided into categories based upon the type of effect produced or manufacturing method. The most common categories are: Airburst - Hanging charges designed to burst into spheres of sparks. Binary powders - Kits divided into separate oxidizer and fuel, intended to be mixed on site. Comet (meteor) - Brightly colored burning pellets resembling shooting stars. Mine - Tubes containing a lift charge intended to project stars, sparks, confetti or streamers. Preloaded Smoke Pot - Cartridges designed to release a mushroom cloud of smoke. Concussion (cannon simulator,concussion tube) - Device designed to create a loud report. Falls - Propellant with titanium burning in an open ended tube creating a falling spark effect. Fireballs / Mortar Hits - Short barreled device projecting smoky rolling ball of flame. Flame Projector - Tube containing nitrocellulose granules that burn in pillars of colored flame. Flare (Torch) - Short, high intensity flames or various colours. Flash Cotton (Sparkle String) - Nitrated cotton string(nitrocellulose). Flashpaper - Sheets of nitrated paper (nitrocellulose) resembling tissue paper. Flash Pot - Short metal pot used with binary powders creating flash, smoke or sparks. Flash Tray (split mine) - A long tube slit down one side to project a sheet of flash. Gerb (including fountain, whistle, and waterfall) - A fountain of sparks. Lance - Small colored flare tube used in making points of light lancework or pictures in fire. Line Rockets - Whistling or colored rocket devices that travel along guide cables. Multi-Tube Article (multi-shot plate, multiple shot repeater boards and bombardo boards; designed to function in sequence) - Multiple effects chained together. Pre-Mixed Powder - Powders intended to create various effects. (Concussions, flashes, etc.) Squib - A small electrically initiated device replicating bullet hits. Strobe - A brightly colored magnesium fueled flare blinking with repetitive flashes. Wheel (Saxon) - Tubes that create a spinning wheel of sparks.
Posted on: Sat, 05 Jul 2014 12:03:47 +0000
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