Re: Post-Cold War Large Surface Combatant Challenge
Posted: May 9th, 2020, 11:54 am
Let’s go into history for a moment. The Cold War is over, the NFR-90 program is close to collapsing and every navy in the world knows things will have to change. It is unlikely the amount of ships, funding and crew can be maintained in the NATO nations, so both the USN and the European navies start to wonder what kind of ships they will need in the new environment. In all the uncertainty of the Cold War, they knew what their ships would be doing and roughly where. The new situation was one of an unknown mission, anywhere on the earth. It was likely the crisis that would require the ships would not be known long in advance, making the time for preparations short.
So, what the NATO needed at the time, would be not-too-costly, highly flexible but still powerful ships which could make high speed crossings over the world’s oceans under all weather conditions, would be independent from large support organisations if needed. Both the USN and NATO needed such a ship, and the solution would be nuclear cruisers…. Except those were extremely costly, too big and not that flexible. The USN had however, in this alternate world, build a few ships which were not that much more expensive then conventional powered ships: the nuclear Spruance, the Thorn subclass. http://shipbucket.com/drawings/4373 The Thorn subclass was powered by LWNP’s, had a slightly lower top speed then the other Spruance class ships, a bit more expensive and needed it’s 4 reactors swapped out every 2 to 3 years operationally.
So, the US Navy proposed a new design/requirement into NFR-90. The Royal Navy, US Navy and the Royal Netherlands Navy would in the end pick this up and build some ships based on this requirement. The USN build 12 Arleigh Burke class DDGN’s, the Dutch would build 4 LCDN and the RN would build 4 Daring class Nuclear destroyers. The 3 classes shared the same hull and machinery, The USN one was heavier armed (96 cell VLS) and the RN one had a different combat system based on PAAMS, and thus a different superstructure and weapons layout.
Core in the design was the Westinghouse E1W, a power generation system based on a small gas cooled nuclear reactor, a turbine, a generator and an automated control system attached to that. The E1W was a raft mounted unit that could be removed, refuelled, tested and configured away from the ship, while no radiation shielding had to be breached to remove this unit for refuelling. The entire raft would be taken to an refuelling facility (one in the US, one in the UK) for refuelling and maintenance when needed. This mean no huge 10-year refit cycle as on the nuclear cruiser, it would even be possible to directly swap the E1W unit for another directly. This operation did not have to take longer then the time to open up the decks and lift out the 300 ton units. Each E1W unit could provide up to 9000 kW. Due to their modular nature, these units could be scrapped (or even be refurbished and reused) separately from the ships they are placed in.
The hull design was based on the USN experience with nuclear cruisers. By creating a long and narrow hull optimised for high speed, the ship could reach over 30 knots on just 20000 kW of power. This meant cruising speed was less efficient and the ship was bigger then needed for the systems on board, but that was thought to be an reasonable trade-off.
The resulting ship was 9019 tons, with an length of 170 m (WL), 177 m (OA) Beam of 17,6 m and a draft of 5,9 m (keel). The ship used 3 E1W units but only 20 10MW electric motors were installed for propulsion. Operationally, this meant the E1W units had to be refuelled every 3 years during constant high speed (nuclear carrier escort) operations or every 5-6 years for less then 20 knot operations. This setup made it possible to use the E1W units as an IEP system, meaning all combinations of the power generation could be used to provide electrical power to the weapons, radars, hotel load and propulsion. For low or peak loads a single SSTG was also installed in the superstructure, for example if quick startup was required. This SSTG and the emergency diesel under the helideck were modified to use aviation fuel so only a single type of fuel was required on board. Due to this power system layout, it could be chosen to “empty” one of the reactors earlier or spread the load over all equally, to vary operational readiness and maintenance cycles.
The radar systems consists of an AEMS (enclosed mast) with in it the Signaal APAR and the Raytheon Planar SPS-49 (for both the USN and the Dutch version). An Sabre ECM system is used on the Dutch ships, while the USN uses their SLQ-32.
The USN ships were commissioned from 1998 onwards, the Dutch from 2003 onwards and the RN ships (due to issues with the development of PAAMS) from 2009 onwards. With refits after roughly 20 years of service planned for most ships to fit the latest weapon and radar technology, it is expected that they will stay in the forefront of these navies until at least 2040.
I could say more, but I think all else I could describe is better described by the drawing. So here it is.
Feel free to ask questions, I will expand upon this text when I place it on the wiki too soon so the description answers all questions Hope you all enjoy!
So, what the NATO needed at the time, would be not-too-costly, highly flexible but still powerful ships which could make high speed crossings over the world’s oceans under all weather conditions, would be independent from large support organisations if needed. Both the USN and NATO needed such a ship, and the solution would be nuclear cruisers…. Except those were extremely costly, too big and not that flexible. The USN had however, in this alternate world, build a few ships which were not that much more expensive then conventional powered ships: the nuclear Spruance, the Thorn subclass. http://shipbucket.com/drawings/4373 The Thorn subclass was powered by LWNP’s, had a slightly lower top speed then the other Spruance class ships, a bit more expensive and needed it’s 4 reactors swapped out every 2 to 3 years operationally.
So, the US Navy proposed a new design/requirement into NFR-90. The Royal Navy, US Navy and the Royal Netherlands Navy would in the end pick this up and build some ships based on this requirement. The USN build 12 Arleigh Burke class DDGN’s, the Dutch would build 4 LCDN and the RN would build 4 Daring class Nuclear destroyers. The 3 classes shared the same hull and machinery, The USN one was heavier armed (96 cell VLS) and the RN one had a different combat system based on PAAMS, and thus a different superstructure and weapons layout.
Core in the design was the Westinghouse E1W, a power generation system based on a small gas cooled nuclear reactor, a turbine, a generator and an automated control system attached to that. The E1W was a raft mounted unit that could be removed, refuelled, tested and configured away from the ship, while no radiation shielding had to be breached to remove this unit for refuelling. The entire raft would be taken to an refuelling facility (one in the US, one in the UK) for refuelling and maintenance when needed. This mean no huge 10-year refit cycle as on the nuclear cruiser, it would even be possible to directly swap the E1W unit for another directly. This operation did not have to take longer then the time to open up the decks and lift out the 300 ton units. Each E1W unit could provide up to 9000 kW. Due to their modular nature, these units could be scrapped (or even be refurbished and reused) separately from the ships they are placed in.
The hull design was based on the USN experience with nuclear cruisers. By creating a long and narrow hull optimised for high speed, the ship could reach over 30 knots on just 20000 kW of power. This meant cruising speed was less efficient and the ship was bigger then needed for the systems on board, but that was thought to be an reasonable trade-off.
The resulting ship was 9019 tons, with an length of 170 m (WL), 177 m (OA) Beam of 17,6 m and a draft of 5,9 m (keel). The ship used 3 E1W units but only 20 10MW electric motors were installed for propulsion. Operationally, this meant the E1W units had to be refuelled every 3 years during constant high speed (nuclear carrier escort) operations or every 5-6 years for less then 20 knot operations. This setup made it possible to use the E1W units as an IEP system, meaning all combinations of the power generation could be used to provide electrical power to the weapons, radars, hotel load and propulsion. For low or peak loads a single SSTG was also installed in the superstructure, for example if quick startup was required. This SSTG and the emergency diesel under the helideck were modified to use aviation fuel so only a single type of fuel was required on board. Due to this power system layout, it could be chosen to “empty” one of the reactors earlier or spread the load over all equally, to vary operational readiness and maintenance cycles.
The radar systems consists of an AEMS (enclosed mast) with in it the Signaal APAR and the Raytheon Planar SPS-49 (for both the USN and the Dutch version). An Sabre ECM system is used on the Dutch ships, while the USN uses their SLQ-32.
The USN ships were commissioned from 1998 onwards, the Dutch from 2003 onwards and the RN ships (due to issues with the development of PAAMS) from 2009 onwards. With refits after roughly 20 years of service planned for most ships to fit the latest weapon and radar technology, it is expected that they will stay in the forefront of these navies until at least 2040.
I could say more, but I think all else I could describe is better described by the drawing. So here it is.
Feel free to ask questions, I will expand upon this text when I place it on the wiki too soon so the description answers all questions Hope you all enjoy!