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Page Title: Torpedoes
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a boxlike device containing eight cells, as shown in figure 20-9, each containing a missile. SUBROC The SUBROC, an antisubmarine  rocket  with a  nuclear  warhead,  is  launched  from  a  submarine torpedo    tube    by    conventional    methods.    After clearing the submarine, a rocket motor ignites and propels  the  weapon  upward  and  out  of  the  water. An   inertial   guidance   system   then   directs   the SUBROC  toward  its  target.  At  a  predetermined range,  the  motor  and  depth  bomb  separate,  the latter  continuing   toward   the   target   area.   Upon reentry  into the water,  the bomb sinks to a preset 15.106 Figure 20-9.—The ASROC cellular launcher. depth, where the warhead explodes. The  target  may be   a   surface   ship   as   well   as   a   submarine.   The SUBROC  system  can  fire  missiles  in  rapid  succes- sion, an important defense against enemy tactics. SUBROC systems are installed in the Permit, Sturgeon,    and    Los    Angeles    classes    of    attack submarines (SSNs). TORPEDOES A torpedo can be  launched  from  submarines, surface ships, or aircraft. The two primary torpedoes in the Navy inventory are the Mk 46 and the Mk 48. A new Mk 48 advanced capability  (ADCAP)  and  Mk 50 torpedo are being phased into the fleet. Mk 46 The  Mk  46  torpedo  is  a  lightweight  ASW torpedo designed to attack high-performance submarines.    The    Mk    46    torpedo    is    presently identified   as   the   NATO   standard   torpedo.   Since introduction of the Mk  46  in  1967,  navies  of  several other countries have acquired it. The Mk 46 torpedo is  designed  to  be  launched  from  surface  combatant torpedo   tubes,   ASROC   missiles,   and   fixed-   and rotary-wing aircraft. Mk 48 and Mk 48 Advanced Capability (ADCAP) The  Mk  48  torpedo  is  carried  by  all  Navy attack and ballistic missile submarines. The improved version—the  Mk  48  ADCAP—is  carried  by  the  SSN 688  and  SSN  637  classes  of  attack  submarines.  The Mk 48 ADCAP will also be used by the Seawolf-class attack  submarines  and  Ohio-class   ballistic   missile submarines. These torpedoes  enable  U.S.  submarines  to sink  hostile  surface  ships  or  submarines  in  the presence  or  absence  of  torpedo  countermeasures. The design of both of these weapons enables  them to   combat   fast,   deep-diving   nuclear   submarines and high-performance surface ships. Both torpedoes    can    operate    with    or    without    wire guidance  and  use  active  and/or  passive  homing. When    launched    they    execute    preprogrammed target-search,  acquisition,  and  attack  procedures. Both    will    conduct    multiple    reattacks    in    the unlikely event they miss the target. The  Mk  48  has  been  operational  in  the  U.S. Navy   since   1972.   The   Mk   48   ADCAP   became operational   in   1988   and   was   approved   for   full production  in  1989.  The  ADCAP  has  significantly increased    capabilities    over    the    Mk    48.    These capabilities  allow  its  employment  against  the  most advanced Soviet submarines. 20-12

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