[PSUBS-MAILIST] Dive fail.

[glen brown via Personal_Submersibles]

Hi James
Saddle tanks sound good ,but i have wondered how much they will effect
 towing . Thinking as a option of an removeable fibreglass skin say 300mm
from pressure hull forming some kind of deck.?
regards
Glen

On Wed, Jul 8, 2015 at 12:54 PM, James Frankland via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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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>>> Personal_Submersibles at psubs.org
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>>>
>>>
>>
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>
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