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Graham1973
Post subject: Re: Nuclear attack sub challengePosted: March 31st, 2019, 11:36 am
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Nice looking designs, anyone stuck for ideas might want to check out Hoods "List of Ships in Fiction" thread, there are some interesting subs in the 1945 - 2020 sections.


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Colosseum
Post subject: Re: Nuclear attack sub challengePosted: April 1st, 2019, 5:50 pm
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Off topic posts moved to the Thiaria thread where they belong.

Please ensure all posts in this thread relate to the nuclear sub challenge. Thanks in advance.

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reytuerto
Post subject: Re: Nuclear attack sub challengePosted: April 3rd, 2019, 10:22 pm
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Good afternoon, gentlemen.

My entry. I am deeply nostalgic of the neat lines of the English submarines of the Swiftsure class, and also (but slightly less) of the American Sturgeon class. So my SSN reflexes this appeal to this SSNs, with concessions to the X type rudder for better maneouvrability in coastal waters, and also a more modern sail.

With the change of the percived menace, the Admiralty decided to create a long range submarine squadron for taking care a vast amount of the western Indian Ocean, from de Strait of Hormuz, to the Cape, and obviusly, the Horn of Africa. For long time in station a nuclear powered vessel was required. The resultant submarine was the Battle II class, the first one, Lemnos was comissioned in December 1996.
[ img ]

Credits: The general form, anechoic "mammalian" tiles, and aerials are from DP previous works. Sometimes, "stealing" ideas (and parts!) is a genuine form of praise! Thanks, Darth Panda! Cheers!

The specs:
Lemnos LS
Type: Nuclear-powered attack submarine
Displacement:
4,300 t surfaced
4,850 t submerged
Length: 87.1 m
Beam: 9.8 m
Draught: 8.5 m
1 Pressurized water reactor
1 shaft
Speed: 26 knots (48 km/h; 30 mph) submerged
Test depth: 250 fathoms
Complement: 105

6 × 21 533 mm amidship torpedo tubes with up to 18 reload weapons.
Typical war load: 4 Sub-Harpoon, and 20 Mk.48 ADCAP torpedos. The torpedos can be parcially replaced by mines.

A double hulled submarine, with a five-compartment arrangement , including the bow compartment, operations compartment, reactor compartment, auxiliary machinery room no. 2, and the engine room. The hull is constructed from a high-tensile micro-alloy steel. With a large GRP sail, which permitted a second periscope and additional intelligence-gathering masts. The fairwater planes are placed at the bow and are retractable. The entire class had the Raytheon Harmonic Power Conditioners which eliminated an electrical bus noise problem. Noise was further reduced covering the hull with anechoic "mammalian" tiles.

Sensors:
Pilkington search periscope attack periscopes.
Kelvin Hughes Type 1007 surface search radar
AN/BQQ-5 sonar sistema based in the AN/BQS-13 spherical sonar array with side array components too, and AN/UYK-44 computer. 104 hydrophone hull array arranged in several locations. And two towed arrays: the TB-12 (later replaced by the TB-16) and TB-23 or TB-29, which are dispensed from the belly. Easily upgradeable commercial off-the-shelf (COTS) processing systems, allowing the introduction of much more sophisticated algorithms compared to earlier sonars.
Combat system was a Modified Raytheon CCS Mk2 (AN/BYG-1).
Countermeasures include a Condor CS-5600 ESM intercept and warning unit, and two SSE decoys. Marconi SDG-1802 degaussing system, a receive-only Link 11 combat information exchange datalink.

Cheers!

PS: I think that the green livery of the German built, Israel Navy SSK is nice, but I don´t know if that color is a suitable one for less confined waters like the Indian Ocean.


Last edited by reytuerto on April 8th, 2019, 12:35 pm, edited 1 time in total.

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TimothyC
Post subject: Re: Nuclear attack sub challengePosted: April 6th, 2019, 6:57 pm
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Naiʻa Class SSN

[ img ]

The Nai'a class submarines were developed out of the 1990s program to recapitalize the Royal Hawai'ian Navy's fleet. While the surface fleet got the Mâkaha class cruisers and the King class Frigates, the submarine force was based on the nearly 50 year old Honu (stretched Oberon) class. By 1997 however, the RHN was able to begin moving forward on their replacement.

The environment that the RHN found itself in was challenging. Operationally, the new submarines needed to have very a long (some analysis would say excessive) range of over 30 thousand kilometers, with a transit speed of at least 23 knots. The boats would also need to have a reduction in crew, while offering more amenities for the crew that were aboard as the RHN had to contend with future crew and retention issues.

The solution to the second problem was found in the partnership with the Royal Navy in a technology transfer agreement was reached in exchange for the submarines to be built by BAE systems in the UK. This agreement would allow for systems, such as air handling, and design features, such as the elimination of hot-bunking, to be shared between the Nai'a and Astute classes.

The first problem proved more difficult to solve. The first two solutions were for very large fuel and battery banks supporting a diesel-electric power train, or for the Hawai'ians to move to a nuclear power plant for their submarines. As the design process continued on these lines it was found that the diesel-electric option resulted in a boat that was ungainly (as large, if not larger than the Japanese I-400 class from WW2), or one that looked to be politically impossible (neither the US nor the UK were disposed to share the pressurized water reactor technology used on their attack submarines).

The solution ended up being a refresh of an older reactor design - the Light Weight Nuclear Propulsion unit from the 1970s. This smaller, self-contained unit would be updated, and the power output reduced from ~18MWe to ~6 MWe. This reduction offered increased core life, which reduced the number of times that the boats would have to spend out of service. This 30 thousand hour full power life of the core was expected to offer five years of service prior to refueling. By proceeding with an order for five hulls, the RHN would be able to maintain an active fleet of four submarines at any time.

To avoid non-proliferation issues with the new S7W LWNPs, the forward section of the unit containing all of the nuclear fuel would be extracted either in Hawai'i, or at a facility on the US west coast. The cores would then be replaced with new/refurbished units containing 'fresh' nuclear fuel. The expended cores would then be transported to the US where they would be processed and refurbished for future use. While the Hawai'ians would be allowed to maintain a small number of 'fresh' cores in storage on the islands, they would be subject to a joint US/UK/IAEA inspection regime to ensure that all of the nuclear fuel was accounted for.

Furthermore, the submarines retained an electric power-train and a large bank of batteries. These systems allow the submarines the ability to make rapid bursts of speed without throttling the reactor output up, and can, in theory, allow the boats to shut down the reactor entirely for very quiet operations.

With the first firm order made in 1999, the first hull was launched just five years later in 2004, and commissioned in 2007. Subsequent units were commissioned at roughly 24 months intervals, with the last unit entering service in 2017. These boats are expected to remain in service until at least 2045, preserving the Hawai'ian submarine capability for the first half of the twenty-first century.

SSN-10 Naiʻa (Dolphin)
SSN-11 Koholā (Whale)
SSN-12 Niuhi (Shark)
SSN-13 ʻAhi (Tuna)
SSN-14 Hanu (Sea Turtle)

Length: ~91m (Just under 300 foot)
Displacement: ~4000 tons submerged
Speed: 24 knots
Range: 30,000 hours at full speed (limited by crew stores)
Reactor: Westinghouse 'S7W' LWNP Mk 2 - Rated for 6MWe
Complement: 45-48 Officers and Crew
Armament: 4 21" torpedo tubes, 24 round magazine of Spearfish and Sub-Harpoon weapons.

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Last edited by TimothyC on April 8th, 2019, 5:09 pm, edited 3 times in total.

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TigerHunter1945
Post subject: Re: Nuclear attack sub challengePosted: April 6th, 2019, 7:33 pm
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here is my entry

Leonardo Da Vinci Class Nuclear Attack Submarine

In 1955,The Italian Naval Command,upon seeing the success of new German Nuclear Submarine,decide to developed its own-new submarine with nuclear powerplant.By direct Il Duce decree in 1955,works on nuclear submarine were commenced,although at first it Il Duce insisted that new subs were to be equip with domestic-Italian designed reactor,but delay in Italian reactor programme,and news of commissioning of American Nuclear Submarine,made Italy use German designed and built reactor,although Germany would assist Italy in developing its own reactor.Leonardo Da Vinci was laid down in June 1955 in La Spezia Naval Dockyard and was Launched in August 1957 and Commissioned in May 1958.

[ img ]

Leonardo Da Vinci was put in many good will voyage across Mediteranian and Europe,Even participating in April 1959 Naval Parade in celebration of Fuhrer Adolf Hitler Birthday.and many voyage across Mediteranian,including port visit into Istanbul later that year and into Odessa and further into Italian Somaliland.In her return journey from Somaliland she was shadowed by US Navy Aircraft and was able to evade further pursuit and reach Gibraltar safely,in 1962 Leonardo Da Vinci made tried to cross North Pole and if possible to reach Japan.but the navigation was so difficult and Da Vinci's crew has to cut her journey into only North Pole.

In 1963 Da Vinci was assigned into Commando BETASOM 5 with South Atlantic Area of operation and spent most carrier with them. For the next year and a quarter she conducted special operations for Commando Sommergibile and then in August 1967, returned to Bordeaux, for another year's stay. During an exercise in 1969 she collided with the German aircraft carrier KMS Wilhelm II der Große and had to undergo repairs in La Spezia which she was repainted with dark blackish pattern,after repaired was completed in 1970,she conducted exercises off the Greece then stationed in Gibraltar after Clash of Azores.

[ img ]

She returned to Bordeaux in September 1971 and operated as a unit of Commando BETASOM 5 for most of the remainder of her career.

On April 1979, Da Vinci set out from Bordeaux on her final voyage.She reached La Spezia Naval Shipyard on 10 May 1979, her last day underway. She was decommissioned and stricken from the Naval Vessel Register on 1 March 1980

General characteristics

Type: Nuclear-powered attack submarine
Displacement:
3,500 tons surface
4,000 tons submerged
Length: 97.1 m
Beam: 8.5 m
Draught: 8 m
Propulsion:UATR-F "Windlade" nuclear reactor (later redesignated Atommotore Sommergibile 1G), geared steam turbines, two shafts
Speed: 24 knots
Complement: 105
Armament : 6 Torpedo Tubes


Last edited by TigerHunter1945 on April 6th, 2019, 8:08 pm, edited 1 time in total.

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odysseus1980
Post subject: Re: Nuclear attack sub challengePosted: April 6th, 2019, 7:49 pm
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Any specs for that wonderful Italian submarine?

My AU Navy also use the acronym "RHN", meaning "Royal Hellenic Navy". To avoid confusion, I suggest "RHaN" for Royal Hawai'ian Navy. Another very beautiful submarine BTW.


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TigerHunter1945
Post subject: Re: Nuclear attack sub challengePosted: April 6th, 2019, 8:09 pm
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Updated with addition of specs and fix some leftover pixels on 1970s drawing


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odysseus1980
Post subject: Re: Nuclear attack sub challengePosted: April 6th, 2019, 8:17 pm
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Quite big sub, larger than US Skate Class


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Armoured man
Post subject: Re: Nuclear attack sub challengePosted: April 6th, 2019, 10:31 pm
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starting in 1955 the Imperial Japanese Navy began work on designing a brand new class of attack submarines to replace the aging type D1's which have been commissioned in the late 40s and early 50s, in conjunction with the development of nuclear power as proportionate system, imperial Naval Command had concluded that a nuclear powered submarines would ultimately be the best way forward for Japanese submarine design, so in 1956 the contract to to build the new class of submarines was awarded to yokosuka naval Arsenal, while the contract to build the submarines nuclear reactor and electronics was awarded to Mitsubishi Heavy Industries, even know the I 560 would be the only one of her class built, she would serve as the stepping stone towards much more efficient and effective reactor designs for future classes of nuclear attack submarines,

General characteristics

Displacement: (4,175 tons surfaced) (4,977 tons submerged )
Length: 108. m (357 ft)
Beam: 9.3 m (31 ft)
Draft: 7.3 m (18 ft surfaced)
Installed power: -2 shaft geared steam turbines, 1 TYPE 17 LW nuclear reactor,11.622 shp
Speed: 29 knots surfaced, (33 mph; 53 km/h), 20 knots submerged, (23 mph; 37 km/h)
Armament:
6 x single TYPE 95 53cm torpedo tubes
[ img ]

_________________
Work list: 1. Tsukiryuu Class seaplane tender(~40% done) 2. Molt sol augustus Class battleship(~45% done) 3. Type 1934A class destroyers (Ongoing Project) 4. Classified Project (~redacted% done)


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Kiwi Imperialist
Post subject: Re: Nuclear attack sub challengePosted: April 7th, 2019, 1:49 am
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After posting a single drawing over four years ago, I thought it might be a good idea to post another. I have been lurking for quite some time and I have thoroughly enjoyed the creations that appear in these challenges.

The Japanese Maritime Self-Defense Force had considered a nuclear-powered attack submarine as early as 1959. The ambition to acquire such a vessel was unceremoniously quashed by the political climate of the time. The role of the JMSDF was limited, and there was no need for a submarine more capable than the small diesel-electric designs then under construction. In 1981, with the United States Seventh Fleet increasingly devoted to the Persian Gulf, the situation changed. The JMSDF took charge of sea-lanes within a 1000 mile radius. In this environment, the utility of a nuclear submarine became apparent. Four nuclear-powered submarines were laid down in 1982. Cancellation was an ever-present fear during construction. The JMSDF knew that public support for a nuclear-powered fleet was limited, if not hostile. Thus, production of the diesel-electric Yūshio class continued without interruption. The first submarine of the new class, named Harushio after an earlier Japanese submarine, entered service in late 1987. The remaining three followed in 1988 and 1989. These were named Natsushio, Hayashi, and Arashio.

The reactor of the Harushio class was a development of the American S6G manufactured under licence by Mitsubishi Heavy Industries. Japan had some domestic nuclear propulsion experience in the form of the merchant ship Mutsu. However, with that ship drowning in failure, an American-designed system was favoured. Ignoring propulsion system, the four submarines represented an evolution of the of preceding Yūshio class. They were significantly larger, allowing them to better accommodate those systems added to the Yūshio class during construction. These included a towed sonar array, a masker system, and torpedo tubes capable of launching the UGM-84 Harpoon. There were, of course, entirely new features including more capable sonars, better electronic warfare systems, and improved sound dampening measures. While not as capable of their American counterparts, the submarines of the Harushio class were considered superior to most of their potential opponents in the Soviet Pacific Fleet, People’s Liberation Army Navy, and the Korean People's Army Naval Force.

A number of minor incidents occurred in the first year following the commissioning Harushio. On one occasion, the submarine was harassed by fishing vessels while returning to port. However, these ceased after it became apparent that the American-designed reactor was safer than Mutsu's Japanese reactor. Due in part to the cost associated with nuclear propulsion, the JMSDF continued to order diesel-electric submarines after the introduction of the Harushio class. Two conventional Oyashio class submarines were constructed for every Harushio, and the JMSDF aimed to maintain this ratio between nuclear and diesel-electric propulsion into the future. Nuclear submarines would serve on extended patrols far from shore, while Japanese territorial waters would be protected by the diesel-electric fleet. The Harushio class was to be replaced by the nuclear-powered Sōryū class by 2018. However, they were prematurely withdrawn from active service in 2012 following the Fukushima disaster. Plans were made to reactivate them following the victory of the Liberal Democratic Party later that year. Unfortunately, public opposition and unjustifiable cost led to their decommissioning in 2015.

General Characteristics
Type: Nuclear-powered attack submarine
Displacement: 4,600 long tons (4,674 t) surfaced, 5,300 long tons (5,385 t) submerged
Length: 291 feet (89 m)
Beam: 36 feet (11 m)
Propulsion: Mitsubishi-manufactured S6G reactor, two steam turbines producting 25,000 hp (18,642 kW), single five-bladed screw
Speed: 16 knots (30 km/h) surfaced, 28 knots (52 km/h) submerged
Complement: 100
Armament: 6 x HU-606B 21-inch torpedo tubes (up to 30 Type 89 torpedoes or UGM-84 Harpoon anti-ship missiles)

[ img ]


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