Bulava was a rather significant step in technology, wrote:
What a significant step? R-29RMU is a much better SLBM.
Bulava was a rather significant step in technology, wrote:
Arrow wrote:What a significant step? R-29RMU is a much better SLBM.
Arrow wrote:
What a significant step? R-29RMU is a much better SLBM.
dino00 wrote:Developer "Borei" compared it with "Virginia"
MOSCOW, December 17 - RIA News . Russian strategic submarine of the project 955 "Borey" produces two times less noise than the American multi-purpose submarine of the type "Virginia", said the general director of the Kurchatov Institute, who participated in the development of nuclear submarines, Alexander Blagov.
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Bold claim!
MOSCOW, December 17th. / TASS /. The noise of the strategic submarine missile cruiser of the Borey project is two times lower than that of the American submarine Virginia. The director of the Research Center Kurchatov Institute, Alexander Blagov, told a reporter on Monday at a round table on the occasion of the 60th anniversary of the nuclear submarine fleet of Russia.
“A lot of work was done to reduce the noise of boats and reduce physical fields. The noise of the Northwind strategic submarine of the Borey project is five times lower than the third-generation multi-purpose submarines of the third generation and twice as low as the American ones” Virginia ", - said Blagov.
The submarines of projects 955 and 955A (Borey and Borey-A, respectively) were developed by the Central Design Bureau of Marine Engineering (TsKB MT) Rubin. Construction of a series of eight units is continuing at Sevmash in Severodvinsk (Arkhangelsk Region).
Differences between Projects 955 and 955A are unknown, however, according to open sources, the Boreye-A, compared to its predecessors, modernized the hull designs, new electronics are used, and Project 955A boats are notable for better stealth.
verkhoturye51 wrote:Well okay that's some more material but still it doesn't make much sense.
So Virginia has an average noise of 95 dB and twice better would be 92 dB, considering that decibels dont scale lineraly. But Russian/Soviet 3rd gen SSBNs classes Akula, Kalmar and Delfin have noises of 100 - 110 dB at speed of 4 - 8 kn, according to this and this sources.
Meaning that a 92 dB Borey would need to be much more than five times more quiet than 3rd gen, even more than ten times! It would be the most quiet submarine in the world by far. But the only official estimate from the U.S. Office of Naval Intelligence suggests that Yasen is more quiet, although still noisier than capitallist Virginia.
https://thaimilitaryandasianregion.wordpress.com/2017/04/08/yasen-graney-class-submarine-project-885885m/ wrote:The new layout method ECUs and auxiliary equipment, cooling systems and reduce the noise power allowed by 10-15 dB. Used vibration-laminated beams, stanchions, conduits and duct elements, other designs, reducing vibration noise by 10-30 dB. The equipment is mounted on a vibration-absorbing honeycomb body made of composite materials. Each structural unit is covered with sound-insulating panels. The housing is covered with a rubber protivogidroakusticheskim PLA coating. The boat used active damping system (SAG) to limit the noise of discrete frequency components of 50-500 Hz.
On SSGNs pr.885M expected use protivogidroakusticheskih type body coverings “Lightning-M” and “Lightning-M-control.” On submarines implemented outboard reinforcement circulation routes or analogous type “Fin”.
PapaDragon wrote:
Crappy low res pic of Knyaz Vladimir but better than nothing
zg18 wrote:.........
model
https://i.imgur.com/700UjN3.jpg
Hole wrote:Argh! Those evil russkies use a evil cloud generating machine to annoy us!
According to Miasnikov from Moscow Institute of Physics and Technology every generation is about 5 db quieter than the previous one so Borey and Yasen should both be about 95 db or roughly the same as Virginia. Perhaps Virginia 95 db, Yasen 96 db and Borey 97 db at 4 - 8 kn (just to give the idea of the order, not real numbers).
I am sure where ever you are it is the same
Well, Yasen has arguably almost closed the gap in radiated noise with Seawolf and Virginia.
We'll have to wait for some patrol reports to tell if the gap has narrowed again.
For Borey there's much less data available. The only official data available just admit it's considerably quiter than Antey. This makes sense because pump-jet decreases high frequency broadband noise. However narrowband noise from flows can be big because of its huge hull.