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    Project 955: Borei class SSBN

    Tsavo Lion
    Tsavo Lion

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    Project 955: Borei class SSBN - Page 34 Empty Re: Project 955: Borei class SSBN

    Post  Tsavo Lion on Thu Mar 19, 2020 11:58 pm

    When China gets a SSBN with Borei's capabilities you let me know.
    There's no big rush to get to that level- those they now have can strike N. America from the SC Sea & Hainan area, protected by CV/Ns, PLA/NAF, & surface ships. They can even sail up & down on the Yangtze river & 2 big lakes connected to it, camouflaged on the top as a barge. In some places, they could even dive with room to spare:
    Even before the river was inundated, its depth in the gorges was considerable, increasing to between 500 and 600 feet (150 and 180 metres) and giving the Yangtze the greatest depths of any river in the world. ...
    At the edge of the Lake Liangzi plain the Yangtze widens markedly, the course of its stream wandering in the form of a large loop. The width of the river is up to 2,600 feet (800 metres), the depth is more than 100 feet (30 metres), ..
    The width of the river increases at this point to between 3,000 and 6,000 feet (900 and 1,800 metres), and the depth in places approaches 100 feet.

    https://www.britannica.com/place/Yangtze-River/The-Yangtze-delta


    Last edited by Tsavo Lion on Sat Mar 21, 2020 3:03 pm; edited 2 times in total
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    Arrow

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    Project 955: Borei class SSBN - Page 34 Empty Re: Project 955: Borei class SSBN

    Post  Arrow on Sat Mar 21, 2020 11:58 am

    flamming_python wrote:
    Arrow wrote:Wow this is rim driven thruster. Electric motor driving fan without a shaft consiting of the outer shell as a stator and then fan as rotator with a bearing against stator. It can be very quiet drives in the future without additional drive shafts etc.
    https://www.nextbigfuture.com/2017/07/china-all-electric-rim-driven-shaftless-ultraquiet-submarine-propulsion.html

    This is the Borei thread, not the thread for your superiority complex against Russia by touting China as the next big thing.

    When China gets a SSBN with Borei's capabilities you let me know.


    This is not the point. It was just an example that China is working on this type of propulsion. It seems that the pirws will apply it to the Russians on Borey A. I wonder what speed they are able to give the submarine these 4 additional propulsors? Can be used for silent slow patrol instead of main drive. The rim driver requires no gears or drive shafts
    GarryB
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    Project 955: Borei class SSBN - Page 34 Empty Re: Project 955: Borei class SSBN

    Post  GarryB on Sun Mar 22, 2020 1:24 am

    Traditionally extra propellers are used for low speed very low noise operations... it adds complication but also redundancy too.

    For an SSBN once it gets to its position it spends most of its time operating at very low speeds so it is not a stationary target, but it has no need to get anywhere in particular other than not be detected so these extra drives allow the main propulsion system be shut down greatly reducing noise without being a sitting duck.

    It also offers an alternative method to get home if there is a problem with main propulsion... but that wouldn't happen often enough to warrant the setup on its own.
    Isos
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    Project 955: Borei class SSBN - Page 34 Empty Re: Project 955: Borei class SSBN

    Post  Isos on Tue Mar 24, 2020 9:56 pm

    Scale down Borei for accoustic tests in a lake in Russia. Also Yasen with removable front to find the best and stealthiest front shapes.

    https://mobile.twitter.com/PararamTadam/status/1240534095140130816

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    Project 955: Borei class SSBN - Page 34 Empty Re: Project 955: Borei class SSBN

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