[PSUBS-MAILIST] Macrospheres

[Alan via Personal_Submersibles]

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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