[PSUBS-MAILIST] Drop weight design

Sat Sep 17 19:47:36 EDT 2016

Brian, I'm in agreement with Hank, keep it simple.  A hopper could work
well,  except,  not much possibility of adjusting weights for trim.

David Colombo
On Sep 17, 2016 2:03 PM, "hank pronk via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

> Hi Brian,
> If you are putting this idea to a vote, my vote is no.  For one you are
> over complicating a uncomplicated feature.  If you want to drop weight in
> increments then you can make that system mechanical just as easy.  You
> could argue that with magnets, the sub would surface if you were unconscious.
> If that is your reasoning then it may be practical.  I have learned that
> less is better in a psub and that goes for all the crap we carry around.
> Heck I carry enough stuff to run away from home and rebuild a small block
> chevy.  ;-)
> Hank
>
>
> On Saturday, September 17, 2016 2:30 PM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Brian,
> We discussed this a few years back, & I can remember Vance making
> some negative comments about the system, saying that on the slightest
> interruption to the power the ballast would drop.
> It may be that because the subs mentioned, are going so deep,
> there are very few other alternatives.
> I have a stack of magnets for fire safety doors, that keep doors open
> & release them to close in event of fire. They don't seem to draw much
> in the way of amps, from memory.
> Of course you would have to epoxy them or something, & they would loose
> a bit of power with the bigger gap caused by the insulation.
> You would need a manual system to hold them in while transporting &
> when the power was off for storage.
> A big plus would be the instantaneous response in an emergency, but
> you could get that other ways.
> Alan
>
>
> Sent from my iPad
>
> On 18/09/2016, at 7:59 am, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> I wonder how many watts those electromagnets take?   I could do some tests
> to see what it would take to hold back the pressure of the shot.
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: via Personal_Submersibles <personal_submersibles at psubs.org>
> To: personal_submersibles at psubs.org
> Subject: Re: [PSUBS-MAILIST] Drop weight design
> Date: Fri, 16 Sep 2016 15:12:10 -0400
>
> Oops, that would be Nautile, the French sub.
>
>
> s
> -----Original Message-----
> From: via Personal_Submersibles <personal_submersibles at psubs.org>
> To: personal_submersibles <personal_submersibles at psubs.org>
> Sent: Fri, Sep 16, 2016 3:09 pm
> Subject: Re: [PSUBS-MAILIST] Drop weight design
>
> The French didn't have anything to do with Trieste except for escort duty.
> It was built in Italy (in Trieste, don't you know) and belonged to Auguste
> Picard, who was Swiss. Then the US Navy. And yes, steel shot was used on
> all the bathyscaphs, including the French one, which was built later and
> called Archimede. And a few others, as well (like Nalutile). All of them
> had some variation of a ring electromagnet at the throat which served as a
> valve.
> Vance
>
>
> -----Original Message-----
> From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.
> org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.
> org>
> Sent: Fri, Sep 16, 2016 2:46 pm
> Subject: Re: [PSUBS-MAILIST] Drop weight design
>
> Actually they used steel shot rather than lead, and the flow was started
> or stopped via an electromagnet. A benefit of this was that you could
> easily shed increments of weight, and another was that if you lost power,
> the sub would drop it's ballast automatically (i.e. fail-safe).
>
> Best,
>
> Alec
>
> On Fri, Sep 16, 2016 at 8:48 AM, Jens Laland via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Gentlemen,
>
> If I'm not wrong, I think the French used a whole lot of off-the-shelf
> lead balls (as used in shotguns) in two individual pellet ballast
> hoppers when they operated the "Trieste" back in the 50's, ref
> https://upload.wikimedia.org/wikipedia/commons/3/31/Trieste_nh96807.svg
>
> Best regards,
> Jens Laland
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