[PSUBS-MAILIST] Macrospheres

[David Colombo via Personal_Submersibles]

Brian, before you order foam,  I'll let you know my experience recently
with the manufacture of foam made for Alec and myself.
David

On Wed, Jun 12, 2019, 6:14 PM Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alan,
>            This is the obvious solution, and is a win win situation.  I
> get more buoyancy and it takes less air to fill the ballast !  I pretty
> much had this in the back of my mind I think but forgot about it , but it's
> great, buoyancy up high where I need it and I have a ready made space for
> it to go.
>
> Brian
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Macrospheres
> Date: Thu, 13 Jun 2019 11:38:16 +1200
>
> Brian,
> you would have to know for sure as if it started to crush, the momentum
> could cause the lot to collapse sending you to the bottom fast.
> Also with just the foam, it is more likely to degrade in time.
> You may be wasting time & money if it doesn't stabilise you as you hope.
> I still think my suggestion of tying various items to varying parts of the
> sub is the quickest & cheapest solution. You could use 20 litre plastic
> containers with handles, inflatable objects etc & anything heavy.
> Come with a truck load of items & divers to place the items & swing on
> the conning tower (test stability). Video the proceedings & weigh every
> thing later after you have it right. Any floatation devices you can hang
> weights
> off to check their floatation, after the cranes gone.
> It took me ages getting my ambient sub right. You think you've got it
> right,
> fail & go back home & melt some more lead :(
> Alan
>
> On 13/06/2019, at 5:22 AM, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> This 16lb density might work:
>
> http://www.uscomposites.com/foam.html
>
>
> Brian
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org
> >
> To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Macrospheres
> Date: Wed, 12 Jun 2019 09:55:51 -0700
>
>   Or maybe a polyurethane foam would be strong enough ?  Without the
> macrospheres
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org
> >
> To: "PSubs " <personal_submersibles at psubs.org>
> Subject: [PSUBS-MAILIST] Macrospheres
> Date: Wed, 12 Jun 2019 09:45:05 -0700
>
> Hi All,
>
> Does anyone know a good source for macrospheres?    500psi would suffice.
>  I was thinking I could fill the upper chamber area of my ferro-cement with
> macrospheres  and seal that top area off .  I could use almost pure macro
> spheres since that area is already a defined chamber.   I tried to find
> Cliff's reference to  "Macrospheres - Cumings Corp BA-38 1/4-3/8" 12-15
> lbm/ft3" from his article on the psubs website but no luck.
>
> Brian
>
>
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