[PSUBS-MAILIST] Vacuum grease

[James Frankland via Personal_Submersibles]

Hi Alec,

Thanks for the update.   Interesting report.  There probably isn't a single
psubber who has had a perfect first launch and like you say, hopefully it
should be relatively easy to correct.  Lots of positives and at least you
managed to avert a flood, that would be a proper nightmare.  Have you got
any pics?  Or are you saving them for the convention?  Actually, are the
talks going to be streamed like last year?  Or at least recorded?  I would
like to watch them as always.  Also, the stability spreadsheet you
mentioned.  Is that a public thing?  or your own?  Could I have a copy?  I
will need something like that for my new boat...

Regards
James

On 26 July 2016 at 13:52, Alec Smyth via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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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