[PSUBS-MAILIST] Vacuum grease

Tue Jul 26 12:23:35 EDT 2016

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.
ThanksJames
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... RegardsJames 
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 quickHank
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