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HE-FRAG WARHEADS

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Warheads are classified as either 2.75 inch or 5.0 inch warheads. They may be further classified as high explosive,  flechette,  smoke,  flare,  or  practice. Warheads for 2.75-inch rockets are normally received with the fuzes installed. There   are   many   different   warheads,   fuzes,   and motor combinations available. Therefore, the following discussion is general. For specific component information,   you   should   refer   to   Aircraft Rocket Systems 2.75-inch and 5.0-inch NAVAIR 11-75A-92. High-explosive  warheads  contain  high-explosive material  (generally  comp-B)  surrounded  by  a  metal case.  An  internally  threaded  nose  fuze  cavity  permits the  installation  of  a  nose  fuze  or  an  inert  nose  plug, depending   on   tactical   requirements.   Some   warhead configurations require the use of a base fuze. Base fuzes are   installed   at   the   factory   and   should   never   be removed.  High-explosive  warheads  are  painted  olive drab  and  may  have  a  narrow  yellow  band  around  the nose. There are several types of high-explosive warheads,  and  each  is  designed  for  a  specific  type  of target. HE-FRAG WARHEADS.—High-explosive frag- mentation  (HE-FRAG)  warheads  (fig.  2-6)  are  used against  personnel  and  light  material  targets,  such  as trucks  and  parked  aircraft.  Upon  detonation,  a  large quantity   of   metal   fragments   accelerates   to   a   high velocity. This action damages the target. The types of HE-FRAG warheads currently in use are listed in table 2-1. REVIEW NUMBER 1 ANSWERS A1. The  two  rockets  currently  used  by  the  Navy are   the   2.75-inch   Mighty   Mouse   and   the 5.0-inch Zuni. A2. If a rocket does not fire when the firing circuit is energized, it is known as a misfire. A3. Thrust   is   the   force   exerted   by   the   gases produced by the burning of the rocket motor propellant. A4. In   rocket   propulsion,   the   Venturi   nozzle decreases  turbulence  of  escaping  gases  and increases   thrust.   Gas   pressure   inside   the container  provides  about  70%  of  the  force, and the escaping gases provide about 30% of the force to move the container forward. A5. The  three  components  of  a  rocket  are  the motor, warhead, and fuze. A6. The components of rocket motors include the motor tube, propellant, inhibitors, stabilizing rod, igniter, and nozzle and fin assembly. A7. The inhibitor restricts or controls burning on the propellant. 2-6 Figure 2-6.—High-explosive fragmentation (HE-FRAG) warheads.



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