[PSUBS-MAILIST] emergency lift bags

[Alec Smyth via Personal_Submersibles]

Hmmmm... if a sub were to have MBTs large enough to surface when flooded,
it might look like an underwater tanker. Perhaps you envision permanently
installed lift bags that would pop up when activated? Basically a sub with
airbags. I don't know, if you're flooded you're pressurized, and I'd argue
it would be more controllable in terms of ascent speed to make a swimming
escape than to ride the sub up. But I do think you might have a point in
terms of avoiding sinking in the first place. If you had a hull breach, hit
the valve to deploy the bags and you at least avoid sinking too deep. I
suppose that makes sense if operating over very deep bottoms. In my
experience, I think I'm always right on the bottom, so don't have any
further to sink, but if I were diving a wall like Karl Stanley's there
could be a scenario for this.


On Wed, Aug 13, 2014 at 6:46 PM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

>
> There was a fatality in a Nekton submarine when a window was knocked off
> by a sinking yacht that was being salvaged.  So there are more dangers
> under the sea than just entanglements.  Is it a waste of money compared to
> electronic gadgets that do nothing but impress your neighbour.  There was
> recently a story told about a sub going down when near the surface and they
> were saved in the nick of time.  A lift bag system would have been pretty
> handy that day.
> Hank
>
>  Subject: Re: [PSUBS-MAILIST] emergency lift bags
>  To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
>  Received: Wednesday, August 13, 2014, 6:04 PM
>
>  Entangled
>  to me is the operative word. These little boats all have
>  multiple means of surfacing and would not require you to
>  flood and escape if you had a loss of power, ran out of HP
>  air, etc. Its really only entanglement that I see as likely
>  to cause you to bail. However, if you don't rip yourself
>  free with MBT blown, thrusters pushing, and emergency weight
>  dropped, then you would probably need an awfully big lift
>  bag to make a significant difference to the situation. Or
>  think of it another way... you already have lift bags, they
>  are called MBTs.
>
>  Alec
>
>  On Wed,
>  Aug 13, 2014 at 5:30 PM, hank pronk via
>  Personal_Submersibles <personal_submersibles at psubs.org>
>  wrote:
>
>  When
>  talking with a friend about escaping from a submarine, he
>  asked why can't your sub have a lift bag capable of
>  raising the sub even when full of water.  I could not give
>  a good reason why not.  A large volume of air would be
>  needed of coarse.  Some fast math on a napkin revealed that
>  6 80cuft scuba tanks could raise Gamma from 600 feet.  Two
>  240cu ft tanks strapped to the bottom of a sub and two lift
>  bags, one at each end  could do it.  Why bail out why not
>  just raise the whole thing unless your tangled and stuck of
>  coarse.
>
>
>  Just a thought
>
>  Hank
>
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