Severodvinsk launched - Video

XabbaRus · 06-16-10, 04:09 AM

Here is a video

http://rt.com/Top_News/2010-06-15/nu...sk-launch.html

Now you don't see much of the sub but I noticed it does not have a pump jet. Given it was started in 1993 and stopped for so long could be the structure was already fixed and could not be incorporated.

I would expect the second one to have one considering the Borei does.

Jimbuna · 06-16-10, 06:37 AM

Would have been nice to see more of her.

I'm probably stating the obvious but I would have thought the cost constraints at the time of construction meant doing away with the pump jet.

I noticed they even cut costs on the method used to break the bottle of champagne on her bow

The initial propulsion specs were:

Quote:

PROPULSION

Water-cooled and water-moderated thermal reactor OK-650V, one shaft, one water jet or low-noise screw.

http://rusnavy.com/nowadays/strength/severodvinsk.htm

TLAM Strike · 06-16-10, 02:12 PM

The link you posted Xabba appears to be dead.

I also noticed that the 7 blade screw isn't highly skewed like on US boats.

Didn't think I saw the aft missile deck for SLCMs shown in some drawings.

XabbaRus · 06-16-10, 02:37 PM

The prop isn't skewed at all.

Then again for the time being that could be deliberate.

TLAM Strike · 06-16-10, 02:42 PM

As I understand it highly skewed propellers reduce cavitation along the end of the propeller blade, which makes me wonder if the Russians have developed something better to counteract that.

Or they have discovered it not as much of a problem.

Or they plan to change propellers once all the press is gone.

...Darn I guess my sig might need a remake... bah I like my version of the Severodvinsk better!

TLAM Strike · 06-16-10, 04:40 PM

Dutchintell has some photos.

Check them out!

Bubblehead Nuke · 06-16-10, 07:31 PM

Quote:

Originally Posted by TLAM Strike

As I understand it highly skewed propellers reduce cavitation along the end of the propeller blade, which makes me wonder if the Russians have developed something better to counteract that.

Or they have discovered it not as much of a problem.

Or they plan to change propellers once all the press is gone.

...Darn I guess my sig might need a remake... bah I like my version of the Severodvinsk better!

Screw design is VERY important when designing your propulsion train. With something as finely balanced and 'tuned' as your reactor plant and support equipment, you do not just change a screw out like you would on your personal watercraft.

This would be the final or very close to final design

XabbaRus · 06-17-10, 03:42 AM

Very odd then that they seem to have taken a step backwards.

The Akulas and Oscars have skewed prop blades, the Borei a pump jet, why on a Submarine started in 1993 they have opted for this type of prop?

They had Akulas at that time with skewed props...

06-16-10, 04:09 AM	#1
XabbaRus Navy Seal Join Date: Sep 2001 Posts: 5,330 Downloads: 5 Uploads: 0	Severodvinsk launched - Video Here is a video http://rt.com/Top_News/2010-06-15/nu...sk-launch.html Now you don't see much of the sub but I noticed it does not have a pump jet. Given it was started in 1993 and stopped for so long could be the structure was already fixed and could not be incorporated. I would expect the second one to have one considering the Borei does. __________________

06-16-10, 02:12 PM	#3
TLAM Strike Navy Seal Join Date: Apr 2002 Location: Rochester, New York Posts: 8,633 Downloads: 29 Uploads: 6	The link you posted Xabba appears to be dead. I also noticed that the 7 blade screw isn't highly skewed like on US boats. Didn't think I saw the aft missile deck for SLCMs shown in some drawings. __________________

06-16-10, 02:37 PM	#4
XabbaRus Navy Seal Join Date: Sep 2001 Posts: 5,330 Downloads: 5 Uploads: 0	The prop isn't skewed at all. Then again for the time being that could be deliberate. __________________

06-16-10, 02:42 PM	#5
TLAM Strike Navy Seal Join Date: Apr 2002 Location: Rochester, New York Posts: 8,633 Downloads: 29 Uploads: 6	As I understand it highly skewed propellers reduce cavitation along the end of the propeller blade, which makes me wonder if the Russians have developed something better to counteract that. Or they have discovered it not as much of a problem. Or they plan to change propellers once all the press is gone. ...Darn I guess my sig might need a remake... bah I like my version of the Severodvinsk better! __________________

06-16-10, 04:40 PM	#6
TLAM Strike Navy Seal Join Date: Apr 2002 Location: Rochester, New York Posts: 8,633 Downloads: 29 Uploads: 6	Dutchintell has some photos. Check them out! __________________

06-17-10, 03:42 AM	#8
XabbaRus Navy Seal Join Date: Sep 2001 Posts: 5,330 Downloads: 5 Uploads: 0	Very odd then that they seem to have taken a step backwards. The Akulas and Oscars have skewed prop blades, the Borei a pump jet, why on a Submarine started in 1993 they have opted for this type of prop? They had Akulas at that time with skewed props... __________________