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ballistic knife
A ballistic knife is a knife with a detachable blade that can be ejected to a distance of several meters by pressing a trigger or operating a lever or switch on the handle.〔Brown, Carl, ''The Law and Martial Arts'', Burbank, CA: Ohara Publications, ISBN 0-89750-134-9 (1998), p. 127〕〔Crawford, Steve, ''Deadly fighting skills of the world'', New York: Thomas Dunne Books, St. Martin's Press, ISBN 0-312-20262-8 (1999), pp. 45-46: The minimum standard demanded of ''Spetsnaz'' recruits when throwing a knife from six feet is three consecutive hits on target; five hits is considered excellent.〕 Spring-powered ballistic knives briefly gained notoriety in the United States in the mid-1980s after commercial examples were marketed and sold in the United States and other Western countries. Since then, the marketing and sale of ballistic knives to civilians has been restricted or prohibited by law in several countries.
==History and usage==
In its spring-propelled form, the blade of a ballistic knife is theoretically capable of being fired to an effective range of around 5 meters (about 16 feet) at a speed of 63 km/h (39 mph).〔 Ballistic knives using compressed air or gas propulsion to fire the blade can be made somewhat more powerful, and do not suffer from spring fatigue over time.
In addition to spring, air, or gas propulsion, the blade of a ballistic knife may also be propelled by an explosive charge, such as a blank pistol cartridge.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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