[PSUBS-MAILIST] Drop weight design

[via Personal_Submersibles]

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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