[PSUBS-MAILIST] Mushroom Valve?

[James Frankland via Personal_Submersibles]

Hi Steve,

Ah I see, your saddle tanks hold floats.  I assume this will add quite
a lot of stability, but if you have the buoyancy compensated with
weight down low, surely the freeboard will remain unchanged?

Will be interesting to see how you get on with them and what
difference they make.  How far off completion are you?

Anyway, I have decided to scrap the saddle tanks idea.  I am going to
make some removable "surface floats" instead.  They will attach to the
side for surface running\towing and be removed to the support boat for
diving.

Not a perfect solution but easier to make, no venting problems and no
hull welding....

Regards
James

On 2 February 2018 at 18:20, Steve McQueen via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:
> James, I believe I will always have the standard fore and aft soft K-250 ballast tanks.  In addition I robbed a similar idea from Snoopy utilizing tubes to hold "variable ballast" floats.  I just liked the idea of having some additional options for trimming and I believe I will get some added surface stability/freeboard (untested yet).
>
> I might also add additional saddle tanks along side my variable ballast float tubes in the future as I want to add some decking with out loosing stability. My in water testing will determine some of this but like you I am interested in towing and general surface stability.
>
>
> Thanks,
> Steve
>
> ---- James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Hi steve
>>
>> Are you having for and aft tanks on your K250 as well as the saddles?
>>
>> I really like the colour, very different from the usual.  Pond green!
>>
>>
>>
>>
>>
>> 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?
>> >>
>> >>
>> >>
>> >>
>> >
>> > _______________________________________________
>> > Personal_Submersibles mailing list
>> > Personal_Submersibles at psubs.org
>> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>> >
>>
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles