From Law Enforcement Technologies
(
www.lawenforcetech.com)
Article can be found at:
http://www.lawenforcetech.com/Suppor...rt%20Nov03.pdf
The following excerpt from
Less-than-lethal "Flashbang" Diversinnary Device explains the flashbang mechanism. For diagrams, photos, and the rest of the report, click the link above.
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The prototype was designed with the features necessary to disperse and ignite the aluminum powder fuel. These features include the threads necessary for fitting the hand grenade time fuse assembly, and a chamber under the grenade fuze to hold the black powder propellant, shown in red (Figure 2). The propellant chamber is sealed with aluminum foil tape, to exclude ambient moisture during storage and handling. The dark grey cap assembly with black powder and time fuse is in turn threaded into the body, depicted in light grey. The main body holds the aluminum powder fuel charge, shown in green. The ports, through which the aluminum is dispersed into the surrounding air, are sealed with Kapton tape, to prevent the fuel charge from leaking out. To initiate the device, the grenade pin is pulled, and the spoon released, which fires a percussion primer, in turn igniting a delay column. The delay column then ignites the output charge of the fuze, which fires into the black powder propellant chamber, igniting the 3.0-gram charge of 4Fg black powder propellant. The grenade fuze output and black powder propellant combustion together, rupture the foil tape seal and apply pressure to the Eckart 5413H aluminum powder fuel charge. The tape sealing the vent ports ruptures, and the aluminum powder is dispersed out of the case, along with the high temperature propellant combustion products. The aluminum powder ignites in the presence of the hot combustion products and ambient air. The burning fuel-air cloud forms the desired luminous output from both the burning aluminum and high temperature aluminum oxide products. The acoustic output is due to the pressurized dispersal event and to some extent is sustained by burning aluminum.
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