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    Project 955: Borei class SSBN

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    verkhoturye51

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    Re: Project 955: Borei class SSBN

    Post  verkhoturye51 on Mon Dec 17, 2018 7:15 pm

    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.

    Arrow

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    Re: Project 955: Borei class SSBN

    Post  Arrow on Mon Dec 17, 2018 7:43 pm

    How much evaluate Yasen in dB? Borey-A has a new pupm jet propulsion. Yasen/YasenM standard screw.
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    Isos

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    Re: Project 955: Borei class SSBN

    Post  Isos on Mon Dec 17, 2018 7:49 pm

    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.

    No need for sources. No one will know those numbers on the net so everything you read is crap.

    Neither would any official tell any real number. They will only say "our is better" since submarine and specially SSBN are highly classified.
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    verkhoturye51

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    Re: Project 955: Borei class SSBN

    Post  verkhoturye51 on Mon Dec 17, 2018 8:27 pm

    Propulsion is only one part of the story:

    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”.

    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).
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    PapaDragon

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    Re: Project 955: Borei class SSBN

    Post  PapaDragon on Mon Dec 17, 2018 9:09 pm


    SSBN base in Rybachy, Kamchatka is being expanded for more Boreis, so much for ''Bulava/Borei don't work''



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    PapaDragon

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    Re: Project 955: Borei class SSBN

    Post  PapaDragon on Mon Dec 24, 2018 3:03 pm


    And first daytime photo of Knyaz Vladimir at sea thumbsup

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    PapaDragon

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    Re: Project 955: Borei class SSBN

    Post  PapaDragon on Sat Dec 29, 2018 8:39 pm


    Crappy low res pic of Knyaz Vladimir but better than nothing

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    Hole

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    Re: Project 955: Borei class SSBN

    Post  Hole on Sat Dec 29, 2018 9:56 pm

    Argh! Those evil russkies use a evil cloud generating machine to annoy us!
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    zg18

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    Re: Project 955: Borei class SSBN

    Post  zg18 on Sun Jan 13, 2019 2:34 pm

    PapaDragon wrote:
    Crappy low res pic of Knyaz Vladimir but better than nothing


    model

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    PapaDragon

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    Re: Project 955: Borei class SSBN

    Post  PapaDragon on Sun Jan 13, 2019 4:37 pm

    zg18 wrote:.........

    model

    https://i.imgur.com/700UjN3.jpg


    Oh man this is excellent thumbsup
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    SeigSoloyvov

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    Re: Project 955: Borei class SSBN

    Post  SeigSoloyvov on Sun Jan 13, 2019 9:21 pm

    Hole wrote:Argh! Those evil russkies use a evil cloud generating machine to annoy us!

    They clearly borrowed Cobras weather dominator.
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    Hole

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    Re: Project 955: Borei class SSBN

    Post  Hole on Sun Jan 13, 2019 9:28 pm

    OMG!
    Putin is cobra commander!

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