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    Project 677: Lada class Submarine

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    Singular_Transform

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    Re: Project 677: Lada class Submarine

    Post  Singular_Transform on Sun Oct 07, 2018 12:19 pm

    PTURBG wrote:I read that china has working AIPs in service since like 2015. Why not buy it from them. Whatever safety risks chinese AIPs carry, surely it would be better than waiting 5-10 more years for a russian version to be developed?

    The AIP doesn't means better submarine than a diesel electric one.

    The swap of lead to lithium could means active thermal management, with cooling liquid circulation.
    It require pumps and heat exhangers, means all component has to be silent, AND safe.

    In the case of AIP the situation is the same, it is quieter than a diesel during charge, but can be more noisy than a diesel during electrical mode.

    So, the challenge is not just simply swap the batteries/ diesel and so on, but to make every element of the system quiet.

    The AIP can be good for long range /deep sea deployments, IF quiet enough .
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    Vladimir79

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    Re: Project 677: Lada class Submarine

    Post  Vladimir79 on Sun Oct 07, 2018 9:44 pm

    hoom wrote:Are they not solid state already? Or just not at the scale needed for subs?

    On the one hand there's like billions of ppl walking around all day, every day with Li-ion batteries in their pockets with relatively few cases of them exploding, on the other hand with all the problems Boeing has had with airliner batteries the idea of having similar issues with a couple orders of magnitude more battery & 300m of ocean overhead is super-terrifying.

    They are not solid state, the first submarine scheduled with solid state batteries is the Australian Shortfin Barracuda.

    kumbor

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    Re: Project 677: Lada class Submarine

    Post  kumbor on Mon Oct 08, 2018 6:30 pm

    Singular_Transform wrote:
    PTURBG wrote:I read that china has working AIPs in service since like 2015. Why not buy it from them. Whatever safety risks chinese AIPs carry, surely it would be better than waiting 5-10 more years for a russian version to be developed?

    The AIP doesn't means better submarine than a diesel electric one.

    The swap of lead to lithium could means active thermal management, with cooling liquid circulation.
    It require pumps and heat exhangers, means all component has to be silent, AND safe.

    In the case of AIP the situation is the same, it is quieter than a diesel during charge, but can be more noisy than a diesel during electrical mode.

    So, the challenge is not just simply swap the batteries/ diesel and so on, but to make every element of the system quiet.

    The AIP can be good for long range /deep sea deployments, IF quiet enough  .

    Both Stirling (external combustion) and MESMA (turbine) are engines with mowing parts. Only fuel cells have no mowing parts - and therefore, they are as quiet as sub on batteries.
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    George1

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    Re: Project 677: Lada class Submarine

    Post  George1 on Fri Oct 12, 2018 1:11 am

    Some good quality photos of head ship from bmpd












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