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Mk-15 Phalanx Close-In Weapon System

The Mk-15 Phalanx CIWS provides ships with an inner layer point defense capability against Anti Ship Missiles (ASM), aircraft, and littoral warfare threats that have penetrated other fleet defenses. Phalanx automatically detects, evaluates, tracks, engages, and performs kill assessment against ASM and high speed aircraft threats. Phalanx is the only deployed close-in weapon system capable of autonomously performing its own search, detect, evaluation, track, engage and kill assessment functions. Phalanx also can be integrated into existing ship combat control systems to provide additional sensor and fire-control support to other installed ship weapon systems.
Mk-15 Phalanx Close-In Weapon System

Block 0

The basic (original) style is the Block 0, equipped with first generation solid state electronics and with marginal capability against surface targets.

Contractor

Designed and manufactured by: General Dyanmics Pomona Division - Pomona, California, USA Acquired by Raytheon Missile Systems

Characteristics

Dimensions
Height: 4.7 meters 15.42 feet
Barrel length: 1.52 meters (L76 gun barrel) 59.8 inches (L76 gun barrel)
Caliber: 20 millimeter
Weight
Weight: 5 500 kilograms 12 125 pounds
Features
Gun: M-61A1 6-barreled Gatling Gun
Rate of fire (ASM and aircraft): 4 500 rounds per minute
Rate of fire (asymmetric threats): 3 000 rounds per minute
Muzzle velocity: 1 097 meters per second 3 600 feet per second
Magazine capacity: 1 550 rounds
Ammunition stowage: 1 550 rounds
Elevation: -10° to +80°
Traverse: -150° to +150°
Effective range: 3.6 kilometers 2.24 miles
Guidance system: Ku-band radar

Timeline

1978 - Production started
1980 - Date deployed (aboard USS Coral Sea - CV 43)

Block 1

The Block 1 upgrade offered various improvements in radar, ammunition, rate of fire, and computing. These improvements were intended to increase the system's capability against emerging Russian supersonic anti-ship missiles. Block 1A introduced a new computer system to counter more maneuverable targets.

Contractor

Designed and manufactured by: General Dyanmics Pomona Division - Pomona, California, USA Acquired by Raytheon Missile Systems

Characteristics

Dimensions
Height: 4.7 meters 15.42 feet
Barrel length: 1.52 meters (L76 gun barrel) 59.8 inches (L76 gun barrel)
Caliber: 20 millimeters
Weight
Weight: 5 500 kilograms 12 125 pounds
Features
Gun: M-61A1 6-barreled Gatling Gun
Rate of fire (ASM and aircraft): 4 500 rounds per minute
Rate of fire (asymmetric threats): 3 000 rounds per minute
Muzzle velocity: 1 097 meters per second 3 600 feet per second
Magazine capacity: 1 550 rounds
Ammunition stowage: 1 550 rounds
Elevation: -20° to +80°
Traverse: -150° to +150°
Effective range: 3.6 kilometers 2.24 miles
Guidance system: Ku-band radar

Timeline

1988 - Date deployed (aboard USS Wisconsin - BB 64)

Block 1B

The Block 1B PSuM (Phalanx Surface Mode) adds a forward looking infrared (FLIR) sensor to allow the weapon to be used against surface targets. This addition was developed to provide ship defense against small vessel threats and other "floaters" in littoral waters and to improve the weapon's performance against slower low-flying aircraft. The FLIR's capability is also of use against low-observability missiles and can be linked with the RIM-116 Rolling Airframe Missile (RAM) system to increase RAM engagement range and accuracy. The Block 1B also allows for an operator to visually identify and target threats.

Contractor

Designed and manufactured by: Raytheon Missile Systems - Tucson, Arizona, USA

Characteristics

Dimensions
Height: 4.7 meters 15.42 feet
Barrel length: 1 981 millimeters (L99 gun barrel) 78 inches (L99 gun barrel)
Caliber: 20 millimeters
Weight
Weight: 6 170 kilograms 13 600 pounds
Features
Gun: M-61A1 6-barreled Gatling Gun
Rate of fire (ASM and aircraft): 4 500 rounds per minute
Rate of fire (asymmetric threats): 3 000 rounds per minute
Muzzle velocity: 1 097 meters per second 3 600 feet per second
Magazine capacity: 1 550 rounds
Ammunition stowage: 1 550 rounds
Elevation: -25° to +85°
Traverse: -150° to +150°
Effective range: 3.6 kilometers 2.24 miles
Guidance system: Ku-band radar and FLIR

Timeline

1999 - Date deployed (aboard USS Underwood - FFG 36)