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CG-49 Vincennes:

The Ingalls factory proposed a further weight reduction plan, first replacing the hull material.

The 01 deck originally built with HTS high-tensile steel plate (yield strength about 50ksi, equivalent to 345MPa) was replaced by HY-80 high-tensile steel plate with higher strength (yield strength about 80ksi, about 549MPa) (which has always been used for submarines).

The broadside and gunwale strakes originally built with HY-80 (below the 01 deck, above the waterline) have also been reduced in thickness, and the part of the side plate that was originally made of HTS steel under this plate has also been replaced. The thickness of the HTS steel plate on the side of the first deck was also reduced, and the bow baffle originally made by HTS was changed to aluminum. As for the skeleton, the original HTS steel was still maintained.

In addition to changing materials, Ingalls also changed several designs and arrangements:

First of all, the front and rear main masts have been changed from the original square type to the triangular type, which can reduce the weight of 8.9 tons.

The cooling system layout of the Aegis system was changed. The system cooling module of the command and decision system (C&D) was moved from the second cooling machine room of the 01 deck to the original location of the storage room on the 01 deck, and the third cooling machine room of the Aegis system was moved to the 03 deck. The forward SPY-1A radar cooling system room was moved down from the 03 deck to the first auxiliary engine room on the second deck, and the rear SPY-1A radar cooling system was also moved from below the original 03 deck to the original aviation equipment storage room on the second deck. These measures can lower the ship's center of gravity by 0.08 feet.

The deckhouse originally located on deck 04 for storing Phalanx 20mm ammunition was cancelled, and the ammunition was stored in a new cabin at the bottom of the triangular mast on deck 03 (that is, in front of the new engine room of the third cooler of the Aegis system), and the Phalanx system The support equipment was moved to the former third cooling room of the Aegis system in front of the helicopter hangar.

The above measures to change the system layout and cabin can reduce the center of gravity by 0.09 feet (68.575px).

Expand the use of new marine cables (AMC) to replace the original MIL-C-915 cables.

The total AMC length of the CG-49 has increased from 55,000 feet (16,764m) of the CG-48 to 85,000 feet (25,908m), accounting for 80% of all cables.

Compared with MIL-C-915, AMC is not only lighter in weight, but also emits less smoke when burning, and does not produce toxicity.

The hangar ventilation ducts are replaced with lighter materials and structures, which can reduce the weight of 4.1 tons.

To install VLS:

In view of the gradual maturity of the MK-41 Vertical Launch System (VLS) developed in 1975, the U.S. Navy decided in early 1980 that the Ticonderoga class contracted and built after the 1982 budget year would use this revolutionary missile. launch system.

At the same time, it also took this opportunity to make large-scale changes to the hull design to solve the problems of insufficient displacement and high center of gravity that have plagued the previous ships of this class.

As mentioned above, the first two CG-52 and 53 with design changes were handed over to Ingalls Shipyard for construction.

CG-52 Bunker Hill:

Since the relevant design parameters of the MK-41 (especially the weight, because of the allocation of bombs) were still undetermined, the US Navy's displacement/center of gravity requirements for the CG-52 were still relatively conservative.

In the initial requirements for the CG-52 issued by the U.S. Navy to Ingalls, the displacement was 9,200 tons and the height of the center of gravity was 23.07 feet, similar to the data when the CG-47 passed the first review of the center of gravity calculation in May 1979, which is more The CG-49 design was approved by the US Navy in October 1980 with much more relaxed requirements.

Chapter 126 Forecast Performance Data