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5-54 - DokuWiki

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5-54 [2009/08/16 07:58]
historian created
5-54 [2011/01/02 15:16] (current)
historian
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 ====== The Mark 68 Linear Rate Gun Fire Contol System ====== ====== The Mark 68 Linear Rate Gun Fire Contol System ======
  
-The Mark 68 GFCS is a dual-purpose (for surface and air targets), linear rate system that is used to control the 5-inch 54 caliber gun. The system can automatically track and engage surface targets and aircraft as well as missiles that travel less than 2,000 knots. The Mark 68 GFCS can provide continuos orders (gun train, gun elevation, fuze order, sight angle, sight deflection, and parallax) to the gun mount. The GFCS is a combination of elements:+The Mark 68 GFCS is a dual-purpose (for surface and air targets), linear rate system that is used to control the 5-inch 54 caliber gun. The system can automatically track and engage surface targets and aircraft as well as missiles that travel less than 2,000 knots (greater than Mach 3). The Mark 68 GFCS can provide continuos orders (gun train, gun elevation, fuze order, sight angle, sight deflection, and parallax) to the gun mount. The GFCS is a combination of elements:
  
   * Mark 68 Director   * Mark 68 Director
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 ===== The Mark 68 Gun Director ===== ===== The Mark 68 Gun Director =====
 +<box 310px left round blue> ​   {{:​mk_68_director.gif?​280x348|}} ​ </​box>​
  
 The gun director determines the present target'​s position in bearing and elevation along the line of sight. It is always located high in the ship to increase the visual detection range and reduce interference from the ship's superstructure. The director may track the target either optically or with the fire control radar. The fire control radar antenna is located on top of the director and the axis of the radar beam is parallel to the optical line of sight. Optical sights in the director consist of the director officer'​s binoculars, the director tracker'​s telescope, and a stereoscopic range finder. Slip rings, an assembly of brushes and circular rings, enable the director to have unlimited train. The gun director determines the present target'​s position in bearing and elevation along the line of sight. It is always located high in the ship to increase the visual detection range and reduce interference from the ship's superstructure. The director may track the target either optically or with the fire control radar. The fire control radar antenna is located on top of the director and the axis of the radar beam is parallel to the optical line of sight. Optical sights in the director consist of the director officer'​s binoculars, the director tracker'​s telescope, and a stereoscopic range finder. Slip rings, an assembly of brushes and circular rings, enable the director to have unlimited train.
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 The stable element is located in the gun fire control room next to the Mark 47 Computer. In general, its primary function is to measure the angles of level and cross-level. The stable element does this by using a gyroscope to establish true vertical and true horizontal. When the ship pitches and rolls, she will cause the director line of sight to move off target when tracking optically, or induce deceptive errors when in full automatic radar track. To keep the director line of sight on target, the stable element continuously sends orders compenstaing for cross-level motion to the director. It also sends level and cross-level to the computer. The stable element is located in the gun fire control room next to the Mark 47 Computer. In general, its primary function is to measure the angles of level and cross-level. The stable element does this by using a gyroscope to establish true vertical and true horizontal. When the ship pitches and rolls, she will cause the director line of sight to move off target when tracking optically, or induce deceptive errors when in full automatic radar track. To keep the director line of sight on target, the stable element continuously sends orders compenstaing for cross-level motion to the director. It also sends level and cross-level to the computer.
 +===== Mark 42 (Mod 10) 5-Inch 54-Caliber Gun =====
 +<box 310px left round blue> ​ {{:​mk42mod10gun.jpg?​280x344|}} ​ </​box>​
 +
 +|< 600px 50% >|
 +| Mount Weight ​ | 139,000 lbs  |
 +| Train Limits| 720 Degrees |
 +| Elevation Limit| +85 Degrees |
 +| Depression Limit| -15 Degrees |
 +| Train Velocity| 40 Degrees/​Second |
 +| Elevation Velocity| 25 Degrees/​Second |
 +| Projectile Weight| 70 lbs |
 +| Projectile Initial Velocity| 2,650 Feet/Second |
 +| Rate of Fire| 40 Rounds/​Minute |
 +| Ready Service Rounds| 40 |
 +| Personnel Required| 12 |
 +| Mount Personnel| 2 |
 +| ABS Crew Protection| Fair |
 +| Re-gunning Time| 1 Hour |
 +| Horizontal Range| 25,909 Yards |
 +| Target Capability| Anti-Ship |
 +| | Anti-Aircraft |
 +| | Shore Bombardment |
 +