Downloaded from https://www.everyspec.com AMCP 706-210 ALUNUM WASHER FUZE BODY (PIBD) fuze, sensing occurs in the nose while detonation proceeds from the base of the missile. Third, electric lues proave the potential for accurate time control for time fuses and for f functioning delays, both of which have not yet been fully realized. Fourth, the use of electric power sources and electric initiation affords in- creased versatility and polsibly less complexity // + in achieving fuze safety. The first step in the initiation of electric fuzes is generally achieved mechanically.
It consists in connecting the power source (1) by using the I force of impact, (2) by electrical signals received from the target, or (3) by command to the elec- HH tric circuit. The second step consists of activating HIGH EXPLOSIV -- ' any timing circuits which lie between the power AIR CJUMNN DETONATOR CHARGE source and the first element of the explosive train. This action culminates in the initiation of the first element of the train at the desired time Figure 3-3. Initiation by Adiabatic Compression and place. More complex, then, than the initiation of explosive charge can be considered to be initiated mechanical fuzes, initiation of electric fues in.
by the temperature rise resulting from the rapid volves power sources, other electric components, compression of the air column upon target im- circuitry, and electrical initiation of the first ex- pact. It is also possible for fragments of the nose plosive element. Electric fuzes are either exter- of the fuze body to cause initiation. While this nally powered or self-powered, each arrangement fuze is easy to manufacture, it is neither as having certain advantages. See also Chapter 7 on sensitive nor as reliable at low velocities or for electric arming. Additional details on power thin targets as firing pin fuzes. sources are covered in other Handbooks' .!
3-4.2 EXTERNAL POWER SOURCES 3-3.5 INITIATION BY FRICTION The amount of electrical energy that can be The heat generated by friction is sufficiently supplied from an external source is large enough high to initiate an explosive reaction. Friction to ease the restrictions that must normally be can be generated in various ways, such as by placed on timing circuits and detonator sensi. rubbing two surfaces together. An example of tivity. For munitions launched from airplanes friction initiation is Firing Device, M2 (Fig. or fired from ships, external power is readily ob- 13-6), wherein a wire coated with a friction corn- tained.
When a fuze is used in the field, on the position is pulled through an ignition mix. Be- other hand, an external power supply may not cause the heating time cannot be closely con- be available. trolled, friction initiation is used only in firing devices, not in fuzes. 34.3 SELF-CONTAINED POWER SOURCES 34 ELECTRICAL FUZE INITIATION The minimum energy required of a self-con- tained power source is that needed to fire a 3-4.1 THE INITIATION MECHANISM detonator. In addition, it may be required to op- erate vacuum tubes or transistors. The source Why should the designer use an electric fuze? must also meet the necessary military require.
First, the electric fuze can operate within a few ments for temperature, ruggedness, and aging microseconds after target sensing. Second, the characteristics. The problems become difficult electric fuze can be initiated from remote places; because of the small amount of available space for example, in a point-initiating, base-detonating for a power source in a fuze. 3-5