[PSUBS-MAILIST] Mushroom Valve?

[Steve McQueen via Personal_Submersibles]

I understand wanting to avoid the welding piece on a finished hull. It will be good to see your results.
 
You are probably right on the freeboard. The tanks I am considering adding (future) will be less susceptible to "burping" and that added benefit might give me more Piece of mind for towing.

I might get in the water for early surface testing this fall.

Thanks,
Steve

---- James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote: 
> 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	owing 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?
> >> >>
> >> >>
> >> >>
> >> >>
> >> >
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