#SubSaturday #Submarines #Naval #Technology
Project 667BDRM Delfin/Delta IV-class SSBN Tula (K-114) on the surface with all 16 missile hatches open.
▶️Note the different shape of the 4 aftmost SLBM hatches no. 13-16.
Here's a short🧵covering this particular design solution:
1/5 @CovertShores @AlexLuck9 @mikeplunkettuk @USN_Submariner @TheSubHunter1 @The_Lookout_N @RSS_40 @R_P_one @EmbersOfSuns @FPSchazly 2/5
When the Soviet SSBNs surfaced through the Arctic ice, the slight up-bubble trim caused most of the ice blocks to accumulate over the aftmost missile hatches, hence the need for the reinforced hatches strong enough to drop the ice blocks off of the missile deck.

#SubSunday #Submarines #Nuclear #Accidents #ColdWar
Resurrecting one of my older threads again.
This time it's a horror story, short🧵:

1. Soviet submarine K-320 was a Project 670 Skat/Charlie I-class nuclear-powered, guided missile submarine (SSGN). Designed by the famous Lazurit design bureau, Charlie-class submarines were made to carry out surprise attacks on the Western/NATO high-value naval assets such as the aircraft carriers and CSG components. @CovertShores @AlexLuck9 @SubBrief @USN_Submariner @TheSubHunter1 @mikeplunkettuk @IBallantyn @The_Lookout_N @RSS_40 @FPSchazly 2. Charlie I-class SSGNs were armed with P-70 Ametist/SS-N-7 STARBRIGHT SLCMs housed in two rows of four missile tubes on each side of the bow & outside the pressure hull, as well as 4x533mm & 2x400mm torpedo tubes capable to launch a variety of torpedoes & decoys.

#SubSaturday #Submarines #Technology #ColdWar
1/14
Project 949A Antey/Oscar II-class nuclear-powered cruise missile submarine (SSGN) Orel (K-266) in a drydock.
Note the hollow propeller shaft🧐
Following is my older thread focused on the issues she faced with her shafts👇 2/14
Orel (K-266) propeller shafts were initially made of a shorter hollow shafts coupled together with bolts & couplings.
The inside was filled with fine quartz sand - the reason for the hollow shaft was that it was easier to manufacture, lighter & cheaper than a solid shaft.

#NavalNews #Shipbuilding
Aaah, this thing again...
1/5
Russian Navy reportedly expressed interest in the Project "Strazh" (Guardian/Sentinel) submersible patrol ship designed by the Central Design Bureau "Rubin", as recently announced by the General Director Igor Vilnit/TASS. @CovertShores @TayfunOzberk @FORONAVAL @R_P_one @AlexLuck9 @TheSubHunter1 @SubBrief @USN_Submariner @The_Lookout_N @KaptainLOMA 2/5
Project "Strazh" design was first unveiled in April 2021 and included two options.
- 1st version displaces ~1000t with length of up to 70m and a crew of up to 42, including an swimmer team. The ship carries SDVs, as well as a drone and there are no weapons installed.

#SubWednesday #Submarines #ColdWar #Naval #Engineering
1/4
Coming back to my earlier tweet showing the Project 667BDRM Delfin/Delta IV-class Tula (K-114) transiting on the surface with all 16 missile hatches open --> note the difference in the 4 aftmost hatches no. 13-16.
🧵👇 @CovertShores @R_P_one @The_Lookout_N @SubBrief @TheSubHunter1 @USN_Submariner @TayfunOzberk @KaptainLOMA @CislakJaroslaw @IBallantyn 2/4
When the Soviet SSBNs surfaced through the Arctic ice, the slight up bubble trim caused most of the ice blocks to accumulate over the aftmost missile hatches, hence the need for the reinforced hatches strong enough to drop the ice blocks off the missile deck.

#SubThursday #Nuclear #Submarines
1/12
Given today's announcement of the Russian MoD to scrap Project 971I/Akula-class nuclear-powered attack submarine "Nerpa" (K-152), here's a thread covering her history riddled with serious accidents.
👇 @CovertShores @AlexLuck9 @IBallantyn @TayfunOzberk @FORONAVAL @TheSubHunter1 @SubBrief @USN_Submariner @RSS_40 @The_Lookout_N 2/12
Project 971 Shchuka-B/Akula-class nuclear-powered attack submarine "Nerpa" was laid down in 1993 at Amur Shipyard in Komsomolsk-on-Amur. Construction works continued until 2002, when the construction was halted due to lack of funding at roughly 70% of hull readiness.

#SubTuesday #Submarines #Technology #ColdWar
1/14
Project 949A Antey/Oscar II-class SSGN "Orel" (K-226) in a drydock. Note the hollow propeller shaft.

Following is a thread about this particular boat and the massive issues she faced with her shafts.👇 @CovertShores @R_P_one @The_Lookout_N @NavyLookout @IBallantyn @AlexLuck9 @CombatAir @SubBrief @USN_Submariner @TheSubHunter1 2/14
"Orel" (K-226) propeller shafts were initially made of shorter hollow shafts coupled together with bolts & couplings.
The inside was filled with fine quartz sand - the reason for the hollow shaft was it was easier to manufacture, lighter & cheaper than solid shaft.

#SubMonday #Submarines #NavalNews #Technology #ColdWar
The sail of Project 661 Anchar/Papa-class nuclear-powered cruise missile submarine K-222, the fastest submarine ever built, to be preserved as a memorial in Primorsky Park in Severodvinsk.
Here's a short🧵on this unique project:

1/6
Project 661 Anchar/Papa-class design works started in the late 50s in the naval design bureau Malachit (then TsKB-16).
Soviet Navy wasn't satisfied with the performance of their 1st generation of nuclear-powered cruise missile submarines (SSGN), e.g. the Project 659/Echo I or Project 675/Echo II-class boats, mainly due to the reason these were only able to launch their missiles while surfaced.
Soviet Navy urgently needed a new class of high-performance submarines, able to deliver a devastating strike while submerged.
The ambitious initial technical specification of the Project 661 included:
- high-speed titanium hull submarine
- twin liquid metal cooled nuclear reactor powerplant (LMR)
- ability to strike the enemy aircraft carrier groups with ten P-70 Ametist/SS-N-7 Starbright solid-fuel anti-ship missiles. 2/6
The first drawings drafts were approved in 1960 and after the technical solution was approved in 1961 the first titanium hull sections were made at the SEVMASH Shipyard.
The use of titanium proved to be extremely challenging and special manufacturing procedures had to be implemented.
For example, the welding of titanium requires a cleanroom with an argon atmosphere to prevent the weld contamination. For this purpose SEVMASH built a special welding chamber. Upgraded version is called Atmosfera-2 and is still operational (photos 1-4 by SEVMASH).
Atmosfera-2 was build in 1971 with internal volume of 300m3 and this is where the titanium pipelines for nuclear-powered submarines are welded in a high-purity argon atmosphere.
Only specially trained & qualified welders are allowed to work in the chamber after passing several medical examinations. Paramedic personnel is always on watch nearby the chamber during all welding sessions.
Before entering, welders must put on a special protective suit with a clean air inlet & a waste air outlet. Welders are allowed to spend max. 4.5hrs in the chamber according to their work instructions.

#SubSaturday #Submarines #History
1. #OTD 23 years ago, Russian Navy Northern Fleet's Project 949A Antey/Oscar II-class nuclear-powered guided missile submarine Kursk (K-141) sunk after one of her torpedoes exploded.
She sank at the bottom of the Barents Sea, killing all 118… https://t.co/GRVKRj2gDHtwitter.com/i/web/status/1…
@CovertShores @Capt_Navy @RSS_40 @TayfunOzberk @FORONAVAL @SubBrief @USN_Submariner @TheSubHunter1 @IBallantyn @navalnewscom 2. Kursk was the 10th hull of the Project 949A Antey/Oscar II-class, her hull was laid down in 1990 at SEVMASH Shipyard, launched four years later (photo 2) and commissioned on 31/12/1994.
At the end of 1999 her crew was declared "the best submarine crew of the Northern Fleet".… https://t.co/TTYdUtO5R2twitter.com/i/web/status/1…

#SubSunday #Submarines #Technology
1. Russian government considering several options how to lift the sunken Project 645/November-class SSN K-27, that was scuttled in 1982 in the Kara Sea off the northeast coast of the Novaya Zemlya archipelago at a depth of 30m.
Short🧵: @CovertShores @Capt_Navy @The_Lookout_N @TayfunOzberk @FORONAVAL @IBallantyn @Aviation_Intel @USN_Submariner @R_P_one @BarentsNews 2. Project 645/November-class SSN K-27 was the first Soviet submarine to use lead/bismuth liquid metal-cooled reactor (LMR). K-27 was written off in 1979 after suffering a major radiological accident in 1968, full story here:

https://twitter.com/Saturnax1/status/1594092872198148096?s=20

#NavalNews #Arctic #Antarctic
1. Russian Federal Service for Hydrometeorology & Environmental Monitoring (ROSGIDROMET) and Admiralty Shipyards signed a contract today for a new research expedition vessel R/V Ivan Frolov for the Arctic & Antarctic Research Institute (AARI). @CovertShores @Capt_Navy @The_Lookout_N @KaptainLOMA @CislakJaroslaw @BuchananLiz @WendtWeiss 2. R/V Ivan Frolov will replace the existing R/V Akademik Fedorov built in 1987 by the Finnish company Rauma-Repola.
"The new R/V is necessary for the smooth operation of Antarctic expeditions. Our country has 5 year-round stations & 5 seasonal bases on the continent."

#NavalNews #Arctic
1. Russian President signed a decree amending the Fundamentals of the State Policy of the Russian Federation in the Arctic for the period up to 2035.
Excerpts & source in the tweets below: @CovertShores @Capt_Navy @The_Lookout_N @TayfunOzberk @FORONAVAL @BuchananLiz @CislakJaroslaw @KaptainLOMA 2. "creation of a control system ensuring the safety of navigation, management of traffic flows in areas of heavy traffic in the Arctic Zone of the Russian Federation, including the implementation of a set of measures for geological, geodetic, cartographic, hydrometeorological...

❗️#NavalNews #Submarines
1. Izvestia agency reports Russian Navy will create a new division of nuclear submarines in Kamchatka - it will include "Belgorod" (K-329) & Project 09851/Khabarovsk, as well as a support vessel.
Note that final decision has yet been made on this. @CovertShores @Capt_Navy @RSS_40 @The_Lookout_N @TayfunOzberk @FORONAVAL @SubBrief @USN_Submariner @Aviation_Intel @KaptainLOMA 2. Izvestia also reports documents confirming the completion of coastal infrastructure construction for the Projects 09851 Belgorod & 09852 Khabarovsk and a Project 20183 support vessel in Krasheninnikov Bay.

#SubMonday #Submarines #Technology
1. Unrealized #ColdWar project of the Soviet Navy - Project 602 Skat, underwater launch platform for ballistic missiles, short 🧵: @CovertShores @Capt_Navy @RSS_40 @The_Lookout_N @R_P_one @TayfunOzberk @FORONAVAL @SubBrief @USN_Submariner @TheSubHunter1 2. Project 602 Skat (not to be confused with the Project 670 Skat/Charlie-class SSGNs) was a proposed underwater launch platform for UR-100M SLBMs (modified UR-100/SS-11 Sego ICBM).
Development began in 1964 in bureau TsKB-18, future design bureau "Rubin", St. Petersburg.

❗️#NavalNews #Submarines
1. Project 941UM Akula/Typhoon-class SSBN "Dmitriy Donskoi" (TK-208) was decommissioned from the Russian Navy.
This was reported today to TASS by the head of the All-Russian Fleet Support Movement Vladimir Maltsev. @CovertShores @Capt_Navy @RSS_40 @The_Lookout_N @TayfunOzberk @FORONAVAL @SubBrief @USN_Submariner @navalnewscom @IBallantyn 2. "The submarine Dmitriy Donskoi has been decommissioned from the Russian Navy. It will await disposal at the naval base in Severodvinsk, along with two other submarines of this project," - he said.

#Submarines #USNavy #ColdWar
Spring of 1982, in the vicinity of Kings Bay. Two Soviet Project 861/Moma-class AGIs following very closely unidentified US Navy's James Madison-class SSBN.
AGI "Ekvator" (418) is in the background. Photo was taken from AGI "Seliger" (SSV-514). @CovertShores @Capt_Navy @RSS_40 @SubBrief @USN_Submariner @The_Lookout_N @TayfunOzberk @FORONAVAL @Aviation_Intel @wachteldean54LV Call out to US submarines, anyone able to ID the James Madison-class SSBN?

#SubWednesday #Submarines #Accidents #OTD
#Nuclear horror story, short🧵:
1. Soviet submarine K-320 was a Project 670 Skat/Charlie I-class SSGN. Designed by Lazurit design bureau, these submarines were intended to carry surprise attacks on Western/NATO high-value naval assets. @CovertShores @Capt_Navy @RSS_40 @SubBrief @USN_Submariner @TayfunOzberk @FORONAVAL @The_Lookout_N @R_P_one @FPSchazly 2. Charlie-I SSGNs were armed with P-70 Ametist/SS-N-7 Starbright SLCMs housed in two rows of four missile tubes on each side of the bow & outside the pressure hull as well as 4x533mm & 2x400mm torpedo tubes capable to launch variety of torpedoes & decoys.

❗️#NavalNews
1. Captain first rank I. M. Krokhmal, commander of Project 22350/Admiral Gorshkov-class frigate "Admiral Gorshkov" reports the frigate is ready for duty & armed with Zircon & Kalibr missile in his report to Putin. Transcript in next tweet:
vk.com/video-13344149… 2. Comrade Supreme Commander of the Armed Forces of the Russian Federation! The commander of the frigate "Admiral of the Soviet Union Fleet Gorshkov" captain of the first rank Krokhmal! The ship went through a full cycle of preparation for the campaign...

#Submarines #ColdWar
1. In the late 60s, Soviet submarine design bureau "TSKB-16 Volna" began designing a large nuclear-powered amphibious transport submarine, Project 717. The idea was for the submarine to travel hidden under the Arctic ice & unload troops & equipment... @CovertShores @Capt_Navy @RSS_40 @TayfunOzberk @FORONAVAL @IBallantyn @The_Lookout_N @CislakJaroslaw @USN_Submariner @R_P_one 2. on the North American coast. The preliminary design was completed in 1971 - powered by two nuclear reactors & enough internal space to accommodate nearly 500 marines and ~20 armoured personnel carriers. Proposed length of the submarine was 190 m, displacement 18.000 t...

#SubmarinesSaturday #Submarines #Accidents
Another #nuclear bedtime story, short 🧵:
1. Russian ROSATOM agency recently announced a plan to recover two sunken nuclear submarines: K-159 (Project 627A/November class SSN) & K-27 (Project 645/November class SSN). @CovertShores @SubBrief @USN_Submariner @TayfunOzberk @FORONAVAL @Capt_Navy @RSS_40 @HMUboff @The_Lookout_N @R_P_one 2. K-159 was one of 12 Project 627A class SSNs - a slightly modified Project 627 Kit, that produced the first Soviet nuclear submarine Leninskiy Komsomol K-3.
Assigned to the Northern Fleet, K-159 was laid down at SEVMASH shipyard in 1962 & commissioned a year later.

#Submarines #SubmarinesThursday #technology
🧵A short #nuclear nightmare bedtime story!
I really shouldn't be reading this stuff before going to bed.

Following is an excerpt from "Russian Nuclear Power Plants for Marine Applications" by Ole Reistad & Povl L. Ølgaard from 2006👇 @CovertShores @Capt_Navy @RSS_40 @FORONAVAL @TayfunOzberk @SubBrief @USN_Submariner @TheSubHunter1 @EmbersOfSuns @R_P_one 1. "The first Alfa-class submarine K-64 became operational in 1970, but suffered a loss-of-coolant accident in 1972 when a leak developed between the secondary water-steam circuit and the primary liquid metal circuit, exposing the primary circuit to a pressure of 70 atm.