[PSUBS-MAILIST] Vacuum grease

Tue Jul 26 22:58:07 EDT 2016

Very interesting suggestion Hank, and I hadn't thought of it. I never got
the chance to sink it, the instability was with the tanks fully blown. I
need to do a little calculating here, to be continued...

Thanks,

Alec

On Tue, Jul 26, 2016 at 12:23 PM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alec,
> Was the sub woozy when you sank it a bit, or did you get that chance.  It
> seems to me you have a lot of buoyancy in those MBT's way down low.  I am
> sure you did that for shallow launches.  I would bet if you let 20% of the
> air out it would be good.  That could be a no cost easy fix, drill a few
> holes so the tanks fill with water to a higher level..
> Hank
>
>
> On Tuesday, July 26, 2016 7:51 AM, James Frankland via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi alec,
> That's great, many thanks.  No rush with the sheet, I am not starting my
> new sub until the new workshop is complete.
>
> I'll check out facebook.
> Thanks
> James
>
> On 26 July 2016 at 14:37, Private via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Actually I don't have s single photo, but Brian put a couple on FB. By all
> means I'm happy to share the spreadsheet, but let me do a little cleanup
> first! I have to work on my material a bit and will use the convention
> presentation as a motivator to do so. But today is a travel day, I'll be
> driving there.
>
> Best,
>
> Alec
>
> On Jul 26, 2016, at 9:19 AM, James Frankland via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> 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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