[PSUBS-MAILIST] Vacuum grease

[Alec Smyth via Personal_Submersibles]

Hi James,

We did the first test yesterday and I'm afraid have some work yet to do.
The good news is the trailer and boat systems seem to be good, and the
cabin and battery pods were watertight. The bad is she had a static
stability issue and will require considerable additional ballast weight. I
have a stability spreadsheet, which indicated a righting moment of 11200
in-lbs in standard configuration. However, when I factor in a few very
normal circumstances (no crewman lying on the floor, captain standing up,
hatch raised because its open) it drops to a puny 460 in-lbs. That was a
bad design oversight on my part but should be easy to correct with
additional ballast. I'll need to add buoyancy as well, which is more
challenging, in order for the sub to remain neutrally buoyant when
submerged. So, not ready yet and I'm afraid I'll be sub-less at the
convention, but at least my presentation should be a bit more interesting.
Lesson learned... when launching a sub for the first time, do so with the
hatch sealed and nobody inside. I launched as if it were an already proven
sub, and things got rather too exciting because she turned out to be woozy
and I was standing in the hatch. We managed to avert flooding, but it was
way too close for comfort.


Best,

Alec

On Mon, Jul 25, 2016 at 6:08 AM, James Frankland via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> hows it going with you new boat Alec?    Must be nearly ready now?
>
> On 22 July 2016 at 23:57, Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Thanks Hank, but I was able to finish all the viewports with what I had
>> on hand. All good!
>>
>> Best,
>>
>> Alec
>>
>> On Fri, Jul 22, 2016 at 4:31 PM, hank pronk via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> Alec,
>>> If you need Dow Corning Vacuum Grease, you can get it from Amazon for
>>> much cheaper.  Also you can get it real quick
>>> Hank
>>>
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>>>
>>
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