[PSUBS-MAILIST] drop weight

[Douglas Suhr via Personal_Submersibles]

>From a displacement perspective, K-250 Snoopy weighs about 2,500 lbs and
drop tray with weights is 154 lbs. ~ Doug S.

On Sat, Nov 12, 2016 at 11:19 PM, Alan James via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hank,
> GL says in Section 7 Arrangement for Diving/Ballasting,
> Control/Compensating & Trimming....
> In the event of the failure of the compensating tank system, the
> submersible shall be capable
> of surfacing by jettisoning of ballast & or emergency blowing of the
> diving tanks, & has to float
> on the surface in an upright stable position.
> Section 15 Rescue system, 3.1 .... Mathematical proof is to be furnished
> that, after release of
> the solid ballast the submersible rises safely to the surface & floats
> there in a stable position.
>    They stipulate elsewhere that you have to have a drop weight; but from
> section
> 7 it seems that it is there only to cover a failure of the compensating
> tank. I assume the compensating
> tank is a hard tank. So you would need enough ballast in your drop weight
> to cover the full
> condition of your compensating tank. This seems a bit funny because your
> air for blowing your
> tanks has to be enough to cover the event of any major failure of a cavity
> such as the battery
> pod. You would think that this air might also suffice for the compensating
> tank failure.
>   So as long as you have enough to cover that, & don't turn upside down on
> the surface or way up,
> ie. your centre of buoyancy is still above your center of gravity, you
> should be right.
>    According to section 7 it seems that as long as there is enough
> compressed air to compensate for any of these
> failures at your dive depth, then you would need very little weight. I say
> very little because
> of the rule that you need a drop weight. :)
> Let me know if it is not making sense.
> Alan
>
>
>
> ------------------------------
> *From:* hank pronk via Personal_Submersibles <personal_submersibles at psubs.
> org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Sunday, November 13, 2016 2:45 PM
> *Subject:* [PSUBS-MAILIST] drop weight
>
> Can someone tell me what the proper weight of a drop weight is.  There
> must be a rule.
> Hank
>
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