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Submarine-Launched Missiles
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done by encasement of the first two stages in epoxied graphite  and  the  third  stage  in  the  filament-wound Kevlar.  The  range  of  the  missile  was  also  increased by  the  aerospike,  a  telescoping  outward  extension that  reduces  frontal  drag  by  about  50  percent.  The new Trident and Ohio classes of submarines carry 24 Trident II missiles that can be launched under water or on the surface. Upon  firing,  the  Trident  II  is  ejected  by  the pressure  of  expanding  gas  within  the  launch  tube. When  the  missile  reaches  the  proper  distance  from the   submarine,   the   first-stage   motor   ignites,   the aerospike  extends,  and  the  boost  stage  begins.  After about 65 seconds the first-stage motor and interstage separate  from  the  missile.  This  allows  the  second- stage motor to ignite and continue the boost phase for approximately 65 seconds. With separation, the third stage  burns  for  nearly  40  seconds,  concluding  the boost  phase.  At  this  point  the  missile  is  traveling more than 20,000 feet per second  (13,600  mph).  The post-boost control system provides thrust and control to  the  equipment  sec-t  ion  until  all  reentry  bodies have been deployed. Characteristics of the Trident II: Length: 44 feet Diameter: 83 inches Weight: 130,000 pounds Range: Over 4,000 nautical miles TRIDENT I (C-4) The  Trident  I  (C-4),  first  deployed  in  1979, will  remain  on  patrol  until  phased  out  in  the  late 1990s.  This  missile  was  designed  to  have  the  same dimensions   as   the   Poseidon   (C-3)   missile.   This enabled the existing Poseidon submarines as well as the  newer  Trident  submarines  to  use  the  Trident  I. Trident  I  has  a  range  almost  double  that  of  the Poseidon.   It   uses   a   three-stage,   solid-fuel   rocket instead of the two-stage, solid-fuel rocket used by the Poseidon. Characteristics of the Trident I: Length: 34 feet Diameter: 74 inches Weight: 73,000 pounds Range: 4,000 nautical miles POSEIDON (C-3) The   Poseidon   (C-3)   missile,   though   being phased  out,  is  still  in  active  use  in  the  Navy.  The Poseidon  was  the  fourth  missile  in  the  Navy’s  Fleet Ballistic Missile Program. The physical dimensions of the Poseidon are identical to the  Trident  1.  The  key differences   are   in   weight,   range,   propulsion,   and warhead, all of which were improved in the Trident I missile. 3.111 Figure 20-6.—An F/A-18 Hornet With Sidewinders missiles. 20-8

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