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  1. 5in technical name
    5" 54 Caliber MK 45 Mod 2
  2. 5" Rate of Fire
    15-20 rounds per minute (based on elevation)
  3. 5" Hot Gun
    50 rounds in 4 hours
  4. 5" Maximum Range
    13 nautical miles
  5. 5" Effective Range (Surface)
    9 nautical miles
  6. 5" Effective Range (Air)
    4 nautical miles
  7. 5" Loader Drum Holds
    20 rounds with 6 fuse types
  8. 5" Barrel Length
    270 inches
  9. 5" Fired From
  10. 5" Round Types
    • BL&P, WP, RAP, SS, VT non-frag, HE
    • Blind White Rappers Suck Very Hard
  11. HE
    High Explosive
  12. RAP
    Rocket Assisted Projectile (Used for long range surface)
  13. WP
    White Phosphorus - Used for smoke, create fires, defoliage (Used for surface)
  14. SS
    Star Shell – Used for illumination (Giant Flare)
  15. VT non-FRAG
    Variable Timed, Non-Fragmentation (Training Round for air)
  16. BL&P
    Blind, Loaded and Plugged (Training round used for surface. No explosive)
  17. 5" Fuse Types
    • i know many gunners mates catch hpv
  18. MT
    Mechanically Timed (surface)
  19. PD
    Point Detonation (surface)
  20. HEET
    High Explosive Electronic Time (surface)
  21. KEET
    Kinetic Energy Electronic Time (surface, small boats)
  22. VT
    Variable Time (air)
  23. IR
    Infrared (air)
  24. CVT
    Controlled Variable Time (air/surface)
  25. MFF
    Multi Function Fuse (air/surface)
  26. GP
    Guided Projectile (surface)
  27. 5" Firing Sequence
    • 1. Projectile and Powder are loaded into the Lower Loading Station.
    • 2. Round is raised up through the Lower Hoist. (3 stations)
    • 2. Round arrives at the Upper Loading Station.
    • 3. Round is moved from Upper Loading Station to the Loader Drum. (Holds 20 Rounds)
    • 4. Round is rotated to the Transfer Station/Fuse Setter.
    • 5. After Fuse is set, Round is transferred to the Upper Hoist.
    • 6. Upper Hoist raises the Round to the Cradle.
    • 7. Cradle raises the Round in line with the Barrel and Breech.
    • 8. Rammer loaded Round into the Breech.
    • 9. Breech Block partially closes.
    • 10. Rammer retracts and Cradle Lowers.
    • 11. Empty Case Tray lowers.
    • 12. Breech Block completely closes.
    • 13. Gun Fires.
    • 14. Breech Block opens and ejects empty case into the Empty Case Tray.
    • 15. Empty Case Tray raises and empty case is ejected above the Barrel.
  28. CIWS/gun barrel technical name
    • Mk15 Mod25 Phalanx CIWS (Close In Weapons System)
    • M61A1 6 barreled 20mm Gatling gun
  29. ASMD
    (Anti-Ship Missile Defense)/ Terminal Missile Defense
  30. CIWS info
    Self contained Search & Track Radar with 6 radar channels, can be changed in event of radar jamming. Radar can determine if a target will hit the ship & can store targets in memory. RCS (Remote Control System) in CIC can also pass target input to CIWS from MSS and SUWC. CIWS receives 440V power supply, seawater for cooling system, & gyro input from ship.
  31. CIWS Rate of Fire (Air)
    4500 rounds per minute
  32. CIWS Rate of Fire (Surface)
    3000 rounds per minute
  33. CIWS Hot Gun
    300 rounds in 5 minutes
  34. CIWS Toxic Gases
    Present for 3 minutes, wait 30 minutes for barrel cooling or cool with water
  35. CIWS Maximum Range
    6000 yards
  36. CIWS Effective Range
    2000 yards
  37. CIWS Search Range
    12000 yards
  38. CIWS Minimum Range Rate (Target Speed)
    148 nautical miles
  39. MT 21
    • Forward, Baseline 1B2
    • Improved radar subsystem, StarFabric computer subsystem, selectable digital radar frequencies
  40. MT 22
    • Aft , Baseline 1B1
    • Traditional analog radar subsystem, High Order Language Computer (HOLC), 6 Fixed frequency crystals
  41. CIWS Round Types
    All rounds are Armor Piercing, Discarding Sabot (APDS) not for use in forward firing aircraft, as the plastic sabots would be sucked into the engine intakes. The sub-caliber penetrator is made of a dense metal (Depleted Uranium or Tungsten) designed to shred missile control surfaces and internal components.
  42. CIWS Mk149 ammo
    • Depleted Uranium/Tungsten penetrator
    • *Not normally used onboard USS Hopper
  43. CIWS Mk244 ammo
    • Enhanced Lethality Cartridge
    • Thicker case, Tungsten penetrator, more powder in cartridge. Can only be used with Optimized Gun Barrels (OGB), which are longer and heavier than previous versions.
  44. CIWS Firing Modes
    • AAW Auto (Fires under computer control)
    • AAW Manual (Operator has to push the “Fire” button)
    • Surface (Operator manually tracks and fires, reduced firing rate of 3000 shots/minute)
  45. CIWS Maximum load
    1550 rounds
  46. CIWS Drum holds
    1500 rounds
  47. CIWS Maintenance load
    1400 rounds
    • HERO 4: Forward
    • HERO 5: Aft
  49. 25mm (25mike mike) technical name
    MK38 Mod 2 25mm Chain Gun
  50. 25mm Rate of Fire
    • Low: 100 rounds per minute
    • High: 180 rounds per minute
  51. 25mm Hot Gun rate of fire
    • 100 rounds in 15 minutes
    • 400 rounds in 60 minutes
  52. 25mm Maximum Range
    4.1 miles
  53. 25mm Effective Range
    3000 yards
  54. 25mm Round Types
    • HEI-T: High Explosive Incendiary Tracer
    • APDS-T: Armor Piercing Discarding Sabot Tracer
    • TP-T: Target Practice Tracer
    • SAPHEI-T: Semi Armor Piercing High Explosive Incendiary Tracer
    • HATS
  55. Crew Served Weapons Mounts
    • 13 Mounts Total
    • 4 Focsle (2 fwd, 1 port, 1 stbd)
    • 2 Bridge Wings (1 port, 1 stbd)
    • 2 Midships (1 port, 1 stbd)
    • 2 Aft VLS (1 port, 1 stbd)
    • 3 Flight Deck (1 port, 1 stbd, 1 aft)
  56. .50 cal technical name
    M2HB (.50 cal) Machine Gun
  57. .50 cal Rate of Fire
    550 rounds per minute
  58. .50 cal Hot Gun
    200 rounds in 2 minutes
  59. .50 cal Maximum Range
    7400 yards
  60. .50 cal Effective Range
    2000 yards
  61. M240 Rate of Fire
    600 rounds per minute
  62. M240 Hot Gun
    200 rounds in 2 minutes
  63. M240 Maximum Range
    3725 meters
  64. M240 Effective Range (Point Target/Area Target)
    800 meters, 1800 meters
  65. Danger Circles
    • 18in Past the furthest protruding point of the mount (5in barrel; CIWS Radome; 25mm camera)
    • 4in Wide (Red)
    • 2in White stenciled lettering says “DANGER AREA”
    • 4ft Spacing from center of lettering (“R” in “DANGER” to the next “R” in “DANGER”)
  66. Hangfire
    Delay in the firing of a round.
  67. Misfire
    Failure of a round to fire.
  68. Hot Gun
    Condition where the weapon has fired enough rounds in a short amount of time that the barrel reaches a temperature high enough to cause rounds to “cook off” and ignite without firing.
  69. NSFS
    Naval Surface Fire Support – Part of Surface Warfare, utilized when Marines are on the ground and need Gunnery support from Naval Ships. Marines call the Ship with the coordinates of the target. CIC plots the target and transfers the information to the GFCS. GFCS tells MT 51 to aim and shoot at the target. If the shot is off, the Marines call in the corrections and the process repeats.
  70. What does blue color coding mean in regards to ammunition?
    Blue color coding means Inert Projectile. The round will still fire, only the projectile is inert.
  71. What are the three primary gun systems used by Navy surface combatants?
    • 5 inch MK 45 Light Weight Gun
    • 76mm MK 75 Gun System
    • 57mm Mk 110
  72. What are the three warfare areas that utilize naval gun systems?
    Strike, Surface Warfare and Air Warfare
  73. What is the purpose of the ships’ gyro as it relates to weapon systems?
    The Ships’ gyro provides a stable horizontal reference and bearing for weapon systems
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