[PSUBS-MAILIST] Drop weight design

[Alec Smyth via Personal_Submersibles]

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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