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CS Monarch (1945) AI simulator
(@CS Monarch (1945)_simulator)
Hub AI
CS Monarch (1945) AI simulator
(@CS Monarch (1945)_simulator)
CS Monarch (1945)
HMTS Monarch, launched on 8 August 1945 and completed during February 1946, was the fourth cable ship with that name. The ship was built for the General Post Office (GPO) for the laying and repair of submarine communications cable and was the largest cable ship in the world when completed and the first cable ship to have all electric cable machinery.
The ship was first engaged in repair and update of existing cables which had been neglected during the war. Monarch laid the first transatlantic telephone cable TAT-1.
In 1969 When the GPO became a public corporation, the Post Office, the designation "Her Majesty's Telegraph Ship" (H.M.T.S.) became the more conventional, commercial designation "Cable Ship" (CS). In 1970 the ship was sold to Cable & Wireless and renamed Sentinel.
The war loss of CS Faraday left Britain without a large cable ship. The government decided the national need for such a ship should be met by construction of a modern cable ship to be assigned to the General Post Office. Cable ships have unique requirements related to having long idle periods in port between cable laying or repairs, operation at low speeds or stopped at sea during cable operations, long periods running astern, high maneuverability, and a fair speed to reach operation areas. Electric drive was considered, but with the war were difficult to obtain. The design thus settled on oil fired boilers and two triple expansion steam engines driving two shafts. After design and model tests with design later coordinated with the builders to refine the final construction plans.
This was to be the fourth cable ship to bear the name Monarch (the first was built in 1830 and was the first to be fitted out permanently as a cable ship; the second Monarch, sunk by a mine in 1915, had been the first cable ship built for the General Post Office; the third Monarch was sunk by a mine in 1944).
Monarch was designed by General Post Office engineers under the Engineer in Chief with the design completed in 1942 but construction delayed by war needs until late 1944. The ship was built at Swan Hunter (Swan, Hunter & Wigham Richardson, Ltd), as hull 1768 at the Neptune Yard, Walker-on-Tyne (Low Walker), and launched on 8 August 1945. The ship, largest cable ship in the world at the time of its launch, was completed and handed over to the Postmaster General in February, 1946.
The ship, as built, was 8,056 GRT, 8,950 DWT, fully loaded displacement of 14,000 tons, 475 ft (144.8 m) length overall, 435 ft (132.6 m) length between perpendiculars, 55 ft 6 in (16.9 m) breadth, and a draft, fully loaded, of 27 ft 10 in (8.5 m). Four 41 ft (12.5 m) diameter cable tanks of 170,000 cubic feet (4,813.9 m3) total volume were capable of holding 125,000 cubic feet (3,539.6 m3) of coiled cable. The tanks held 2,500 nmi (2,900 mi; 4,600 km) of deep sea telegraph cable or 1,500 nmi (1,700 mi; 2,800 km) of coaxial telephone cable with repeaters. A hold, forward of the cable tanks, was available for lines and cable buoys. Oil bunkers had a 2,000 ton capacity with boiler feed and fresh water capacity each of 400 tons.
Monarch differed from all previous cable ships in having all electric cable machinery. That avoided the need to run high pressure steam piping through forward parts of the ship and condensation problems in cold weather but had disadvantages regarding even torque and variable cable load from zero to full load. The ship's three cable engines, two forward (160 h.p. motors) for picking up or paying out and one aft (90 h.p) used for braking in stern laying, were supplied power by an unusual system of a constant current power supply to meet the requirements of cable laying. The cable machinery forward was for laying cable in shallower water or picking up and retrieving cable in all depths. The aft machinery would be used for long deep water cable runs.
CS Monarch (1945)
HMTS Monarch, launched on 8 August 1945 and completed during February 1946, was the fourth cable ship with that name. The ship was built for the General Post Office (GPO) for the laying and repair of submarine communications cable and was the largest cable ship in the world when completed and the first cable ship to have all electric cable machinery.
The ship was first engaged in repair and update of existing cables which had been neglected during the war. Monarch laid the first transatlantic telephone cable TAT-1.
In 1969 When the GPO became a public corporation, the Post Office, the designation "Her Majesty's Telegraph Ship" (H.M.T.S.) became the more conventional, commercial designation "Cable Ship" (CS). In 1970 the ship was sold to Cable & Wireless and renamed Sentinel.
The war loss of CS Faraday left Britain without a large cable ship. The government decided the national need for such a ship should be met by construction of a modern cable ship to be assigned to the General Post Office. Cable ships have unique requirements related to having long idle periods in port between cable laying or repairs, operation at low speeds or stopped at sea during cable operations, long periods running astern, high maneuverability, and a fair speed to reach operation areas. Electric drive was considered, but with the war were difficult to obtain. The design thus settled on oil fired boilers and two triple expansion steam engines driving two shafts. After design and model tests with design later coordinated with the builders to refine the final construction plans.
This was to be the fourth cable ship to bear the name Monarch (the first was built in 1830 and was the first to be fitted out permanently as a cable ship; the second Monarch, sunk by a mine in 1915, had been the first cable ship built for the General Post Office; the third Monarch was sunk by a mine in 1944).
Monarch was designed by General Post Office engineers under the Engineer in Chief with the design completed in 1942 but construction delayed by war needs until late 1944. The ship was built at Swan Hunter (Swan, Hunter & Wigham Richardson, Ltd), as hull 1768 at the Neptune Yard, Walker-on-Tyne (Low Walker), and launched on 8 August 1945. The ship, largest cable ship in the world at the time of its launch, was completed and handed over to the Postmaster General in February, 1946.
The ship, as built, was 8,056 GRT, 8,950 DWT, fully loaded displacement of 14,000 tons, 475 ft (144.8 m) length overall, 435 ft (132.6 m) length between perpendiculars, 55 ft 6 in (16.9 m) breadth, and a draft, fully loaded, of 27 ft 10 in (8.5 m). Four 41 ft (12.5 m) diameter cable tanks of 170,000 cubic feet (4,813.9 m3) total volume were capable of holding 125,000 cubic feet (3,539.6 m3) of coiled cable. The tanks held 2,500 nmi (2,900 mi; 4,600 km) of deep sea telegraph cable or 1,500 nmi (1,700 mi; 2,800 km) of coaxial telephone cable with repeaters. A hold, forward of the cable tanks, was available for lines and cable buoys. Oil bunkers had a 2,000 ton capacity with boiler feed and fresh water capacity each of 400 tons.
Monarch differed from all previous cable ships in having all electric cable machinery. That avoided the need to run high pressure steam piping through forward parts of the ship and condensation problems in cold weather but had disadvantages regarding even torque and variable cable load from zero to full load. The ship's three cable engines, two forward (160 h.p. motors) for picking up or paying out and one aft (90 h.p) used for braking in stern laying, were supplied power by an unusual system of a constant current power supply to meet the requirements of cable laying. The cable machinery forward was for laying cable in shallower water or picking up and retrieving cable in all depths. The aft machinery would be used for long deep water cable runs.