New Russian submaine

[Linton]

I found these on the web.It is a new ssbn.What do you think they are trying to conceal on the top vertical stabilizer?

[Tchocky]

Towed array, maybe. If the fin is tall enough to clear the screws.

Actually, since the screw area is covered I'd say it's a pumpjet.

I take it this is the new Borey class, Yuri Dolgorukiy?

[Linton]

You are correct in the name and that probably is a pumpjet,but why the covered fin?Here are a few more of her:
http://pilot.strizhi.info/2007/05/04/3373

[Officerpuppy]

Maybe it has a Soviet flag on it and it's just waiting for things to hit the fan and have the sub friendly to the new goverment.:rotfl:

Kidding aside, those pictures look pretty neat.
http://en.wikipedia.org/wiki/Borei_class_submarine

[geetrue]

Good find Linton, lovely pictures.

Perhaps a way to communicate with the home base has been included in the vertical fin ... we would stream a radio cable back 200 feet or so from the sail
on the first FBM's, but that was over three decades ago.

Hindsite sonar also comes to mind, but it is awfully noisy back there unless they go to all stop now days and listen without doing a crazy Ivan.

I wonder what that screw looks like, obviously built for speed.

[Skybird]

Originally Posted by Linton

What do you think they are trying to conceal on the top vertical stabilizer?

Nasty tail art...?

[sonar732]

Originally Posted by Tchocky

Towed array, maybe. If the fin is tall enough to clear the screws.

Even though it's a pumpjet, it just wouldn't be feasible for a towed array to be placed above the screw. Tacticfully, it would be impossible for the sub to travel slow with it deployed as the array would fall right behind the sub and thru the pumpjet flow. Even though it's a pumpjet, say the sub was rising and going slow...the array would be trailed right behind it and risk getting tangled as the pumpjet was pulling water from the same area.

[lesrae]

Dustsheets - maybe they were painting the ceiling in that hall?

It's going to be a pain for them if they're going to have to cover the rudder every time the boat's alongside.

[lesrae]

Originally Posted by sonar732

Even though it's a pumpjet, it just wouldn't be feasible for a towed array to be placed above the screw. Tacticfully, it would be impossible for the sub to travel slow with it deployed as the array would fall right behind the sub and thru the pumpjet flow. Even though it's a pumpjet, say the sub was rising and going slow...the array would be trailed right behind it and risk getting tangled as the pumpjet was pulling water from the same area.

I don't see how that would be any more of a problem than having one secured to the port/stbd stabiliser when the boat's turning, although I believe there are maneouvering limitations with the tail deployed.

[Prof]

Originally Posted by sonar732

Even though it's a pumpjet, it just wouldn't be feasible for a towed array to be placed above the screw. Tacticfully, it would be impossible for the sub to travel slow with it deployed as the array would fall right behind the sub and thru the pumpjet flow. Even though it's a pumpjet, say the sub was rising and going slow...the array would be trailed right behind it and risk getting tangled as the pumpjet was pulling water from the same area.

I thought the large pod on the vertical stabiliser on the Victor III and Akula classes was a towed array?

[sonar732]

After viewing a schematic of the Victor III, I thought the pod went a little bit farther than the screw. So, my apologies for misguiding on the verticle fin.

[geetrue]

I hope it's safe to say that the US Underwater Labortory had a plan in the late 60's to put two sonarman in a small sonar pod and float it off away from the boat so they could detect anything in their patrol area without own ships noise.

The plan was just to do this every once in a while and then real them in for food and a rest.

I remember our sonar gang kidding around about who would volunteer for a crazy thing like that while we cruised the Med at 2 to 4 kts around 200' on the Ethan Allen SSBN 608.

Did you ever hear of that crazy plan Sonar 732?

[sonar732]

Originally Posted by geetrue

I hope it's safe to say that the US Underwater Labortory had a plan in the late 60's to put two sonarman in a small sonar pod and float it off away from the boat so they could detect anything in their patrol area without own ships noise.

The plan was just to do this every once in a while and then real them in for food and a rest.

I remember our sonar gang kidding around about who would volunteer for a crazy thing like that while we cruised the Med at 2 to 4 kts around 200' on the Ethan Allen SSBN 608.

Did you ever hear of that crazy plan Sonar 732?

God no...I'm sure that Sub Sailor probably would've though as he was a COB in the 40 for freedom fleet.

[Oberon]

Possible Sat image of the Borei, although it's hard to tell... Jury is still out.

[Rav3n]

Any idea why they have extended the "turtledeck" several meters front of the sail?. Looks weird. It doesent give you anymore space either as i guess this is outside the pressure hull. Cant see any hatches either (if it was for some special equipment, towed array, comms etc). Was expecting a design more streamlined than the Delta IV, but no. At least they have removed the dive planes from the sail.
Regarding the covered rear fin, could be a Pelamida towed array system like on the Bulava testbed (Dmitry Donskoy) and the Oscar/Delta class, but cant see the reason for covering it.
Here is a picture from Sevmash, looks better than earlier pictures, at least they have put on all the acoustic tiles.


http://www.sevmash.ru/?m=show&id=3335&lg=en