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Topic review - Calling all Russian submarine fans
Author Message
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
And the Yankee Class screws, which were not skewback and probably emitted a significant "blade rate" low frequency for US sonar detections.


Attachments:
Yankee class SSBN props.jpg
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Yankee SSBN Screws.jpg
Yankee SSBN Screws.jpg [ 127.81 KiB | Viewed 3697 times ]
Yankeee class screws.jpg
Yankeee class screws.jpg [ 126.92 KiB | Viewed 3697 times ]
Post Posted: Thu Dec 14, 2023 9:56 am
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Dave, Mike,
Here are the Oscar propellers photos I have, and are Oscar II.
Oscar I is reported to have (depending on the source) either 4 or 5 blade non-skew screws. Probably similar to the Delta III and Papa 5 blade screws below
These are from Vepr's collection. He would probably answer himself but is busy on his research work.


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Oscar stern-4.png
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Oscar stern-2.jpg
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Oscar stern -3.jpg
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Oscar blade tip shape.jpg
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Oscar stern from deck.jpg
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File comment: Delta III 5 blade screws
Delta III class screws.jpg
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File comment: Papa 5 blade screws
Papa in drydock.jpg
Papa in drydock.jpg [ 538.9 KiB | Viewed 3695 times ]
Post Posted: Thu Dec 14, 2023 9:47 am
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
I appreciate you considering the things I proposed and putting so much work in. Unfortunately pictures of OSCAR I screws are few (and are probably all screencaps from the same movie). I'll keep looking.

Cheers,

Dave
Post Posted: Wed Dec 13, 2023 8:33 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
ssn705 wrote:
Woodstock74 wrote:


Saw it yesterday. Very exciting. Especially with the hull break that could potentially make STRETCH, SIDECAR and NOTCH more easily possible :)

Planning on doing screws for it (and others I might have mentioned)?

Cheers,

Dave


Always a possibility of course. As for the Oscar I and Akula suggestion. The Akula was fairly straight forward but I haven't printed a production level yet, only a handful of prototypes. The Oscar is a pickle and I've been working on it on and off since the summer; without photos to go off of I'm using the Victor screw (the tandem-fixed screw like on the Mike) as a surrogate. And I'm struggling to get anything I like and for now avoiding reevaluating the Mike while I'm at it (but once I crack the Oscar I'll probably look at reworking the Mike).


it is unlike the Mike and more like the Victor but for now I just can't get it to look 'right'. And I'm avoiding reevaluating the Mike, and it'll probably need it once I crack the shape issues I'm running into with the Oscar I. And the shame of it all is that using the Victor screw as a surrogate, there are actually tons of photos from different angles and what I'm running into is a hardstop on my CAD abilities I think, for now.
Post Posted: Tue Dec 12, 2023 5:02 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Woodstock74 wrote:


Saw it yesterday. Very exciting. Especially with the hull break that could potentially make STRETCH, SIDECAR and NOTCH more easily possible :)

Planning on doing screws for it (and others I might have mentioned)?

Cheers,

Dave
Post Posted: Mon Dec 11, 2023 9:35 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Mikro-Mir doing a Yankee class:

https://www.facebook.com/mikro.mir.dnepr/posts/pfbid0zkCRNofdnpq2UZeRkf9rx9QVwS2eXv9xBuR15BSj9kTgEuLsBXeVxtuSFw9mBpjsl
Post Posted: Mon Dec 11, 2023 4:55 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Another screenshot...


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Screenshot_20230805_211520_Chrome.jpg
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Post Posted: Fri Aug 18, 2023 8:08 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Nice. Thanks Jacob. I love these old movies.

Dave


Attachments:
Screenshot_20230805_211536_Chrome.jpg
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Post Posted: Thu Aug 03, 2023 6:38 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
ssn705 wrote:
Anyone happen to have a picture of OSCAR I with the early tandem screws.

Dave


Dave,

See this 1983 Soviet film about Project 949:

https://www.youtube.com/watch?v=Fk29x3u928o

The propellers are at 5:10.

Jacob
Post Posted: Thu Aug 03, 2023 1:55 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Anyone happen to have a picture of OSCAR I with the early tandem screws.

Dave
Post Posted: Sat Jul 22, 2023 9:02 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Jacob,
Great reference. Thanks for posting. The large tank under the pressure hull is certainly interesting.

Dave
Post Posted: Fri Feb 03, 2023 9:38 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
ssn705 wrote:
Could be. It is just interesting that they are high on the outer hull. I'm doing an OSCAR II with one side of the missile hatches open (so I'll be scratching some internals), so I'm just trying to decide which way to position the small doors on the side...seems like shut is the way to go.

Dave


Yeah, I think closed is fine. It appears that only the limber holes next to the missiles have covers; all the others are open with gratings. You can see some of them open and some closed in this photo of the Orel:

https://i.imgur.com/7olm3hA.jpg

The limber holes next to the missile tubes are probably to flood and drain the "bathtub," analogous to the VLS bathtub flood holes on U.S. SSNs. These cross-sectional views show the missile bathtub areas (MBTs shown in dark shades):

https://i.imgur.com/Ucd1CV4.png

These sectional views are pretty illuminating because they show where the flood holes must be. At the keel there is some sort of variable ballast tank (safety, negative, or auxiliary tank?), so the MBT flood holes are not right at the keel. The tops of the MBTs are often within the superstructure (like old U.S. double-hull submarines) and that superstructure needs to flood and drain somehow.

Jacob
Post Posted: Thu Feb 02, 2023 6:40 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Could be. It is just interesting that they are high on the outer hull. I'm doing an OSCAR II with one side of the missile hatches open (so I'll be scratching some internals), so I'm just trying to decide which way to position the small doors on the side...seems like shut is the way to go.

Dave
Post Posted: Wed Feb 01, 2023 8:53 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
ssn705 wrote:
Anyone happen to know the purpose of the vents on the upper sides of Russian subs. They're almost always open on the surface in port or near port. When underway heading out to sea they are shut (for streamlining) and presumably the same for submerged ops. Best guess is just to allow drainage of the void space between hulls above the waterline for surface stability concerns, but anyone happen to know if there is a particular reason and routine? Any reason for them to be open when submerged?

Dave


They're supposed to automatically close at a certain depth to fair the hull. They might be similar to the MBT flood hole covers on U.S. nuclear submarines that were used briefly around 1960. Those covers had an air cylinder and counterweight that was balanced to shut the flood holes below periscope depth. When blowing the MBTs, 400# air was blown into the cylinders, opening the covers. The Navy quickly decided that system was more trouble than it was worth and returned to putting anti-vortex louvers on the flood holes. I wouldn't be surprised if on some Russian submarines the closures for those holes have been removed entirely.

Jacob
Post Posted: Tue Jan 31, 2023 2:16 am
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Anyone happen to know the purpose of the vents on the upper sides of Russian subs. They're almost always open on the surface in port or near port. When underway heading out to sea they are shut (for streamlining) and presumably the same for submerged ops. Best guess is just to allow drainage of the void space between hulls above the waterline for surface stability concerns, but anyone happen to know if there is a particular reason and routine? Any reason for them to be open when submerged?

Dave
Post Posted: Mon Jan 30, 2023 8:53 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Moving the K-3 Leninsky Komsomol (NATO November Class)through the streets of St. Petersburg to its final destination as a museum. Launched in 1957 and retired in 1988, the restoration took years to remove the reactor and address corrosion and deterioration after almost 30 years in "storage". The submarine was divided into two sections and barged to Kronstadt port. The trip through the city was 4.5 kilometers, done in a single night.

Here's the press information:
The restoration of the first Soviet nuclear submarine K-3 "Leninsky Komsomol" has been completed, preparations have begun for an engineering operation to deliver the submarine to the place of eternal parking in the Museum of Naval Glory of the Island of Forts tourist cluster in Kronstadt.

Restoring the appearance of the "Lenin Komsomol" took longer than planned, it was previously reported that the submarine would be delivered to Kronstadt at the end of spring this year. At the moment, apart from the timing, nothing has changed. As reported, on August 27, 2022, the first part of the engineering operation will begin, as part of which the submarine will be withdrawn from the territory of the Kronstadt Marine Plant and towed to the Vyborg shipbuilding plant, where it will be installed on the Atlant submersible barge.

Next, the barge will deliver the submarine to the port of Kronstadt and raise it to its level. On this, the first part, called the sea, will end and the second, land, will begin. As previously reported, the submarine will be divided into two parts according to the donor compartment, which replaced the reactor compartment, and will be loaded onto special self-propelled axles capable of moving along city streets. Only one night is allotted to overcome the distance of 4.5 km from the port to the museum. After delivery, the submarine will be reconnected and installed in the place allotted for it. After the opening of the museum, visitors will be able not only to see the submarine from the outside, but also to visit inside.

K-3 "Leninsky Komsomol" - the first Soviet and the third nuclear submarine in the world, the lead ship of Project 627 "Kit". Launched on August 9, 1957. She entered service on July 1, 1958, on March 12, 1959, she became part of the 206th separate submarine brigade based at Severodvinsk.

Thought question: In picture 3 & 4 the submarine is turning. So is that technically a right turn or a turn to starboard? Discuss among yourselves...


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K-3 restoration-3.jpg
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K-3 restoration-2.jpg
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K-3 move-1.jpg
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K-3 move-2.jpg
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Post Posted: Thu Oct 13, 2022 4:57 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Yes, it is probably mostly for protection against ice in the Arctic SSBN bastion when the submarine breaks through the ice pack to fire her missile
Post Posted: Fri Sep 16, 2022 5:40 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Likely minimal advantage to the nozzles. Primarily for protection in the arctic since the the screw is conventional and doesn't look "fitted" to the nozzle in most pictures I have seen.

Dave
Post Posted: Wed Aug 31, 2022 8:30 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Ha, I remember drawing that frowny face on that photo for something I posted on reddit years and years ago (I have no memory of why I drew said frowny face). Very amusing that that is the version of the pic still circulating haha. Here's the original:

https://i.imgur.com/OnJJUuG.jpg

Yes, they are Typhoon propellers. I had no idea until yesterday, when I was browsing through this recent modeling thread on the Typhoon:

http://forums.airbase.ru/2016/12/t94598--proekt-09410-09412-shifr-akula.html

The unskewed five-bladed propellers were probably only on TK-208, and only for a short time.

Jacob
Post Posted: Tue Aug 30, 2022 11:37 pm
  Post subject:  Re: Calling all Russian submarine fans  Reply with quote
Vepr157 wrote:
The Typhoon just had standard propellers inside an accelerating duct (i.e., a Kort Nozzle). There weren't any stators and even the propellers look very conventional; they have a smaller chord toward the tip like a normal open propeller.

Jacob


I note at least two variants, these, which look very much like very, very conventional submarine props circa 1955:

https://qph.cf2.quoracdn.net/main-qimg-64d105bcf720d8bf93a36a009a367367

And this, which looks like a really broad-blade scimitar prop:

Image

While we're at it, is this the backside of the Typhoon's 7-blade prop?

https://drikus.club/uploads/posts/2021-12/1640923393_9-drikus-club-p-grebnoi-vint-podvodnoi-lodki-borei-tekhnik-10.jpg

https://hdpic.club/uploads/posts/2021-10/1635222429_63-hdpic-club-p-vint-korablya-94.jpg
Post Posted: Tue Aug 30, 2022 8:27 pm

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