Downloaded from https://www.everyspec.com AMCP 706-210 # adaptable to the maximum extent possible to 1-5.1 IMPACT FUZES automated mas projection and inspection meth- ods. This is necessary in order to minimize These are fuzes ii which action is created human errors in manufacture and assembly, within the fuze by actual contact with a tar- and to minimize production costs. get; the action includes such phenomena as im- pact, crush, tilt, electrical contact, etc. Among 1-5 CATEGORIES the fuzes operating by impact action (alterna- tively referred to as contact fuzes) are: (a) point.
Fuzes may be identified by their end item, detonating (PD) fuzei located in the nose of the such as bomb or mortar projectile; by the pur- projectile, which furction upon impact with the pose of the ammunition, such as armor-piercing target or following impact by a timed delay, and or training; by their tactical application, such as (b) base-detonating (BD) fues located in the air-to-air; or by the functioning action of the base of the projectile, which function with short fuse, such as point-detonating or mechanical delay after initial contact. The delay depends on time.
Fuzes may also be grouped as to location, the design and may include a delay element such as nose or base; as to functioning type specifically delaying the functioning fot as much such as mechanical or electrical; or as to caliber, as (typically) 0.25 sec. The base location is as- Table 1-1 lists common fuze categories. How- lected to protect the fuze during perforation of ever, subtitles within groups are not mutually the target in the case of armor-piercing projec- exclusive, tiles. In shaped charge projectiles the fuze is Typical nomenclature would be Fuze, Bomb point-initiating, base-detonating (PIBD) where Nose, M904E1.
Whereas identifying features, the target sensing element is in the nose of the such vs MT (mechanical time) or HEAT (high projectile and the main part of the fuze is in the exploave antitank), were formerly added to base. This base position is required in order that fuze nomenclature, the current trend is to the explosive wave will move over the shaped minimize such descriptive terms. A more de- charge cone in the proper direction. tailed description of common classifications Contact fuzes are conveniently divided ac- follows, cording to response into superquick, nondelay, and delay. A superquick fuze is a nose fuze in TABLE 1-1.
FUZE CATEGORIES which the sensing element causes immediate ini- tiation of the bursting charge (typically less ly End It. By Fund iong A.ti,,n than 100 microseconds). To attain this, the sens- Somb ling element is located in the extreme nose end of Genade Point-Ntonatng (PD) the fuze. A nondelay fuze is one in which there GualedMisie DuDetonating (BD) is no intentionally designed delay, but where mine Pointvinitltng,Bae Mirtar Detonating (PIaD) there is some inherent delay because of inertial Proetue Dely (*tort or long) comy 'nents in the fuze which initiate the explo- Tocetm sive train. Nondelay elements may be incorpor. Time By Purpose Pyrotechnic Time (Pr) ated in either PD or BD fuzes.
The inertial device ~ (UU)Mechanica Time (MTj is used when a small degree of target penetra- lectrical Time (ET) Armor-Pie ing (AP) Self-Detruction (SD) tion is acceptable or desired, and for graze cmt(Hl) Pressut action. Delay fuzes contain deliberately built-in Chuemical Preaure Concrete-picng (Cp) Hydrootatic delay elements which delay initiation of the Ho Explo - ve Auitan (HAT) armet main charge, after target impact. The elements lumition my h ,,,,.. of the fuze which bring about the delayed action signal Target Practic am are in effect "time fuze" elements (see below).
Training Internal Delay elements may be incorporated in either Bly Tactial ApUp'ation PD or BD fuzes; however for very hard targets, ,to-Air armor-piercing projectiles, which always have Ar. .tomUnd BD fuzes, are called for. Emplaced In certain fuzes, such as bomb fuzes, longer Caound.WO-Ai delays are frequently used. For example long 1-5