Hamilton-class cutter

Hamilton-class cutter

The Hamilton-class cutter was the largest class of vessel in the United States Coast Guard until replaced by the Legend-class cutter, aside from the Polar-class icebraker. The hull classification symbol is prefixed WHEC. The cutters are called the Hamilton class after their lead ship, or the “Secretary class” because most of the vessels in the class were named for former Secretaries of the Treasury (with the exception of the “Hero-class cutters” JarvisMunro and Midgett).

Design

The Hamilton-class cutters were designed to be a highly versatile platform capable of performing various operations, including maritime law enforcement, search and rescue, oceanographic research, and defense operations. Because of their endurance and capabilities, the Hamilton-class cutters commonly deployed with Carrier Battle Groups. They were built with a welded steel hull and aluminum superstructure. The Hamilton-class cutters’ hull was designed with a V cross section, and through tank testing the hull was expected to survive and stay afloat longer after suffering damage. They are powered by a Combined Diesel or Gas (CODOG) system consisting of two diesel engines and two gas turbines, and have controllable-pitch propellers, they were the first U.S. military vessels with combination diesel or gas turbine operation. Equipped with a helicopter flight deck, retractable hangar, and the facilities to support helicopter deployment.

Combat Suite

The Hamilton-class cutters were designed and built during the Cold War, due to this they were originally equipped for anti-submarine warfare (ASW), with the capability to find, track and destroy enemy submarines. When constructed, they were armed with a 5″/38 naval gun, two 81 mm mortars, two .50 caliber machine guns, two MK 10 Hedgehogs, two MK 32 torpedo tube systems, and Nixie torpedo countermeasures. During the 1980s and 1990s the cutters were modernized under the Fleet Rehabilitation and Modernization (FRAM) program. The FRAM program replaced the 5″/38 gun with the MK 75 76 mm naval gun, upgraded the MK 32 Surface Vessel Torpedo Tubes to Mod 7, installed MK 36 SRBOC launchers and the AN/SLQ-32 electronic warfare suite, and upgraded the cutters’ sonar and their air and surface search radars.[6] During the modernization of the cutters the U.S. Navy saw the program as a low cost and easy way to use the cutters as a valuable force multiplier with trained crews that could be called upon during war. After the completion of FRAM, a joint Navy/USCG board decided further upgrades to the cutters’ armament would be implemented, including the installation of Harpoon anti-ship missiles and a MK 15 Phalanx CIWS. The Harpoon anti-ship missiles were fitted to multiple cutters of the class but only one cutter, the USCGC Mellon, ever fired a Harpoon missile (in January 1990). After the collapse of the Soviet Union, the joint Navy/USCG board decided there was no military threat to require the installation of anti-ship missiles and anti-submarine weapons on board cutters, and subsequently removed the weapons. After the removal of the ASW weapons, the Coast Guard installed MK 38 25 mm chain guns on both sides of each cutter. Currently the Hamilton-class cutters are equipped with the Coast Guard’s SeaWatch command and control system, which combines navigational, tactical, surveillance and communications into one situational awareness picture, replacing the cutters’ outdated Shipboard Command and Control System. Missile defense is handled by the MK 36 launchers and the Phalanx CIWS.

Specifications

Type High endurance cutter
Displacement 3,250 metric tons
Length 378 ft (115 m)
Beam 43 ft (13 m)
Draft 15 ft (4.6 m)
Installed power – 2 × 550KW GM 8-645 diesel generators
– 1 × 500KW Solar Model 101506-2001 gas generator
Propulsion – CODOG system
– 2 × Fairbanks-Morse 38TD8-1/8-12 12-cylinder diesel engines generating 7,000 hp (5,200 kW) and 2 × Pratt & Whittney FT4A-6 gas turbines producing 36,000 hp (27,000 kW)
Speed 29 kn (54 km/h; 33 mph)
Range 14,000 nmi (26,000 km; 16,000 mi)
Endurance 45 days
Complement 167 and can carry up to 186
Sensors and
processing systems
– AN/SPS-40E Air Search Radar
– AN/SPS-78 Surface Search Radar
– AN/WLR-1H Electronic Support Surveillance Equipment
– MK 92 Fire Control System
– TACAN
Electronic warfare
& decoys
2 × MK 36 SRBOC launcher system
Armament – 1 × OTO Melara Mark 75 76 mm/62 caliber naval gun
– 2 × 25 mm Mk38
– 1 × MK 15 Block 1 20 mm Phalanx CIWS
– 6 × .50 caliber machine guns
Aircraft carried 1 × MH-65 Helicopter
Aviation facilities Flight deck and Hangar

Operators

Related Armament

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