Sea Control Ship

Last updated

Sea Control Ship 1972.JPG
Artist conception (1972)
Class overview
NameSea Control Ship (SCS)
BuildersNever built
Operators United States Navy
Cost$100 Million USD 1973 dollars (est.) $626 Million USD 2022 dollars (est.)
Planned8
General characteristics
Type ASW carrier
Displacement
  • 9,773 tons (light)
  • 13,736 tons (full load)
Length620 ft (190 m)
Beam80 ft (24 m)
Draft21.62 ft (6.59 m)
Propulsion
Speed
  • 26 knots (48 km/h)
  • 24 knots (44 km/h) (sustained)
Complement
  • 76 officers
  • 624 enlisted
Armament2 x 20-mm Phalanx CIWS mounts
Aircraft carried
Aviation facilities
  • Flight deck: 545 ft × 105 ft (166 m × 32 m)
  • Enclosed hangar: 19 ft (5.8 m) high
  • Aircraft elevators: 60,000 lb. (27.2 mt) lift capacity
  • Centerline: 60 ft × 30 ft (18.3 m × 9.1 m)
  • Stern: 35 ft × 50 ft (11 m × 15 m)
  • JP-5 fuel capacity: 950 tons (861.8 mt)
  • Aviation ordance: 180 tons (163 mt)

The Sea Control Ship (SCS) was a small aircraft carrier developed and conceptualized by the United States Navy under Chief of Naval Operations Elmo Zumwalt during the 1970s. Currently the term refers to naval vessels that can perform similar duties. [1] The SCS was intended as an escort vessel, providing air support for convoys. It was canceled after budgetary cuts to the US Navy.

Contents

The SCS was to be equipped with a mix of Rockwell XFV-12 fighter aircraft and anti-submarine warfare helicopters. [2] It was tasked with carrying out anti-submarine warfare operations.

Concept

ASW escort and US Navy

When Soviet Navy increased submarine technology this led to the formation of special anti-submarine warfare (ASW) carrier groups. US Navy also wanted faster surface ASW forces, including new fast escort carriers. World War II era escort carriers [CVEs] were too slow to operate against the new Soviet attack submarine threat and were too small to operate the newest ASW aircraft. The US Navy decided best solution was to convert surplus Essex class carriers to antisubmarine warfare (ASW). During the 1960s there were never enough CVSs for ASW protection, and by the early 1970s there would be no ASW carriers at all.

Required to provide escorts for convoys during wartime, old but upgraded Fleet Renovation and Modification (FRAM) WWII ships provided mass to the U.S. Navy. But by the early 1970s replacing those several hundred warships built during World War II was urgent. These ships included the nentioned 9 Essex-class carriers modified to be used as antisubmarine warfare platforms (CVS).

In the late 1960s, studies by US Navy identified a potential requirement for large scale convoy operations in the event of a war with the Soviet Union. In order to compensate for a shortage of escort ships, it was suggested that helicopters operating from small helicopter carriers could fill the gap. Other countries experimented with this ASW concept. The Japanese developed the helicopter destroyer (DDH) and the Soviets developed the Moskva class which combined cruiser and ASW helicopter carrier.

High-low approach

The primary mission of the Sea Control Ship (SCS) was protection of underway replenishment groups, amphibious groups, convoys and task groups with no aircraft carriers. The Sea Control Ship (SCS) was a small and austere carrier designed to protect sea lines of communication (SLOCs).

When Elmo Zumwalt became Chief of Naval Operations in 1970, he seized on the idea of small helicopter carriers as part of his "High-Low" plan in which large numbers of cheaper lower capability ships would be built to supplement existing expensive high capability ships. The proposed small carrier, which was named the Sea Control Ship (SCS), was required to provide continuous airborne cover of two anti-submarine and one airborne early warning helicopters, as well as carrying VSTOL fighters to stop Soviet long-range aircraft (like the Tupolev Tu-95 "Bear") from shadowing convoys and directing submarines and surface ships against them. This resulted in a requirement to carry 14 helicopters and three VSTOL fighters such as the AV-8 Harrier. It was hoped that production SCSs could be built for $100 million each, an eighth of the price of a full sized aircraft carrier. [3] [4]

The resultant design had a full load displacement of 13,736 long tons (13,956 t) and an overall length of 610 feet (190 m). It was to be powered by two General Electric LM2500 gas turbines generating 45,000 shaft horsepower (34,000 kW) and driving a single shaft, which would propel the ship to a speed of 26 knots (48 km/h; 30 mph). Weaponry was to be limited, consisting of two Phalanx Close-in weapon systems to defend against anti-ship missiles. [3]

Its planned price was to be 100 million 1973 dollars, about 12,5% the price of a nuclear carrier. Maine peacetime missions would be to show the flag in contested waters, this IS Mediterranean and the Western Pacific. Big carriers would been withdrawn from that mission and would be deployed out of reach of an enemy first strike. In wartime positions would be reversed and the sea control ships would serve in mid-ocean.

Implementation of the idea

When the idea was presented to the Congress the Sea Control Ship (SCS) funding was rejected to be included in FY 1975 shipbuilding program. The idea was rejected on the basis of limited size, capability, and speed. Subsequently US Navy examined which designs could provide a more flexible employment of sea-based tactical aircraft in a wider range of low threat situations as well as being able to conduct effectively anti-submarine operations in North Atlantic.

As of the late 1970s, the 22,000-ton VSS design had replaced SCS in US Navy plans. A 33,000-ton VSS design also existed, It could operate fixed-wing aircraft (in limited numbers) as well as VSTOL aircraft and ASW helicopters, offering a multi mission Ship.

When SCS concept was born several VSTOL aircraft were under development in United States for ship-based use. The more promising were the Hawker Siddeley-McDonnell Douglas AV-16, the Rockwell XFV-12 Thrust-Augmented Wing (TAW) and the Grumman Nutcracker. By the 1970s all failed to materialize in a viable operational plane. Only limited performance AV-8A planes were avaible. US Navy aviators didn't like the idea of replacing their high performance aircraft by AV-8As. Others in US Navy didn't want money to be diverted from nuclear aircraft carriers to small carriers. In the end Nimitz class carriers were approved in the 1980s by Reagan administration and US Navy quickly forgot about the SCS and VSS designs.

Experimental Sea Control Ship

In 1971 USS Guam was chosen as a test vessel. Testing began on 18 January 1972. In 1974 she was deployed to the Atlantic Ocean. The vessel was equipped with AV-8A Harrier STOVL fighters and SH-3 Sea King ASW helicopters. The mainly ASW tests were completed in July 1974; USS Guam resumed its role as an amphibious assault ship.

In 1981 the LHA-4 Nassau undertook a new proof of concept demonstration of the Sea Control mission in the Mediterranean, operating 20 USMC AV-8C Harriers. USS Nassau again embarked 20 Harriers in 1990 for operations in Iraq. During Operation Iraqi Freedom in 2003, both LHD-5 Bataan and LHD-6 Bon Homme Richard each operated 24 AV-8B Harriers.

The Spanish aircraft carrier Principe de Asturias was based on the original Sea Control Ship design SNS Principe de Asturias (R11) during Dragon Hammer 92.jpg
The Spanish aircraft carrier Principe de Asturias was based on the original Sea Control Ship design

The SCSs were smaller than most fleet aircraft carriers, and the concept was seized upon by nations wanting inexpensive aircraft carriers. Spain's Príncipe de Asturias, and her smaller cousin ship, Thailand's HTMS Chakri Naruebet, were based on the final US Navy blueprints for a dedicated sea control ship, but with the addition of a ski-jump ramp and follow a similar mission profile. [5]

See also

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References

  1. Sea Control Ship – GlobalSecurity.org
  2. XFV-12 – GlobalSecurity.org
  3. 1 2 Gardiner and Chumbley 1995, p. 575.
  4. Friedman 1985, p. 352.
  5. GRESHAM, JOHN D. (29 March 2016). "The Sea Control Ship". Defence Media Network. Retrieved 4 August 2021.

Notes

Further reading