[PSUBS-MAILIST] Mushroom Valve?

Fri Feb 2 08:03:49 EST 2018

 Alec,That was not my idea, it was Alan's.Hank
    On Friday, February 2, 2018, 5:01:08 AM MST, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hi James,
If they are just for surface stability, I think Hank has the best idea... just seal them up and forget the moving parts! If I might add to that, I would make up a few steel rounds that weigh the same as the net buoyancy of those tanks. Put the steel rounds inside the battery pods, in the interstices left by a rectangular battery in the round tube. You will find they wedge down nicely at a very low point in the sub, and will give you as much righting moment as the tanks. Pick rounds of an appropriate diameter so they're too big to pass between the TOP edge of the battery and the pod, that way they can't bounce up and short out the battery posts.
Best,Alec
On Fri, Feb 2, 2018 at 5:35 AM, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi All,

Thanks for the advice.  The tanks are simply for surface stability and
better towing ability.

I think I will simply pipe the tanks to two Kittredge style valves in
the conning tower.  The same as the main tanks.

With vents at the for and aft of the tanks, hopefully any bubble will
vanish reasonably quick.  I will put 3/4 inch pipe.

I might put deck plates on as well.  We'll see.

Starting tomorrow......

Many thanks
James

On 1 February 2018 at 18:54, Steve McQueen via Personal_Submersibles
<personal_submersibles at psubs. org> wrote:
> James, When you do mount, like others have said, ensure the mounting attachments are beefy enough you can also support some decking with these mounts (if you want). I have similarly placed variable ballast tubes on my K-250 that will also be used to support my decking.
>
> For improved stability I am also considering adding some smaller saddle tanks in the future in conjunction to the variable ballast tubes I have.
> I think for this application Alec's arrangement on Snoopy  (1 mech. thru hull in tower) was clean and simple. I anticipate I will do the same.
>
> I have attached a couple of photos.
>
> Thanks,
> Steve
>
> ---- James Frankland via Personal_Submersibles <personal_submersibles at psubs. org> wrote:
>> Hi All,
>>
>> I am adding saddle tanks to Jodie B.
>>
>> Im not 100% sure what to do with regards to the vent plumbing.  I would
>> like to ask if anyone has any advice?
>>
>> I am thinking of putting 2x through hulls on the top of the main pressure
>> hull.  For and aft of the tower and then piping the vents to a valve that
>> would operate through them.  Similar to the existing vents.
>>
>> OR, fit the through hulls at the side so they penetrate the tanks and have
>> a linkage of some sort that operates valves attached to the top of each
>> tank, for and aft.  Some sort of mushroom valve??
>>
>> Any ideas?  What have other people done?
>>
>>
>>
>>
>
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