[PSUBS-MAILIST] Dive fail.

[James Frankland via Personal_Submersibles]

Hi Glen,

If I were doing it again, I wouldn't bother with the standard MBTs at all.
I would make saddle tanks like on the "Nemo" sub.  For better surface
stability and enclosed, so you don't burp air.    Im going to change my
boat over the winter to have tanks like that instead, or probably as well.
Hank has done the same on his Gamma.

Im not sure what you mean with the poly carb sheet attached to the top of
the fore mbt?  Is this for a deck of some sort?

I paid a boatbuilding company to make the fibreglass tanks for my boat.
They made the plug out of a load of blue builders foam sheets stuck
together and shaped that.  Then made the mould from that and layed the
glass into it.  The same as Dan H did I think.

regards
James


On 8 July 2015 at 11:37, glen brown via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi James
> I am busy with my k350 mbts at the moment trying to copy Dan's plug,
> mould, product. I was thinking of using a section of poly carb sheet
> attached to the top of my fore mbt.
> Any comments?
>
> Thanks Glen
>
> On Mon, Jul 6, 2015 at 11:04 AM, James Frankland via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
>> Hi All,
>>
>>
>> I had a failure of a day on Sat.  I put the boat in, and it had a leak.
>> Not into the pressure hull, so it wasn’t a complete failure, but the leak
>> was from the forward main tank.  The nearly useless windows that I put on
>> the forward tank were leaking air.  Not just a little bit which I could
>> have put up with it, but loads.  The boat was diving quicker than venting
>> normally.
>>
>>
>>
>> I pulled it out and went around tightening them up.  Put it back in and
>> it didn't make any difference.
>>
>>
>>
>> It was strange as they have been perfectly ok before.  I think the
>> problem is that on Friday while I was prepping the boat for diving, I went
>> around and tightened the bolts.  It must have broken the seals.
>>
>>
>>
>> Anyway.  I could have possibly winged it by running with a reduced main
>> ballast, but as I was heading into the open sea, I thought I best be
>> sensible and call it off.
>>
>>
>>
>> So It was in for about 10 minutes.  Pulled it out and was home by 8:30,
>> very disappointed.
>>
>>
>>
>> Spent the afternoon sticking them in with Sikaflex and moaning.
>>
>>
>>
>> Hope these pics make it through.  You can just see the air spilling from
>> the widows in the second picture and the boat is going down nose first.
>>
>>
>>
>> Kind Regards
>>
>> James
>>
>>
>>
>>
>> ​
>> ​
>>
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>>
>
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