[PSUBS-MAILIST] syntactic foam

[hank pronk via Personal_Submersibles]

I am not sure but I did come across a cut away picture of one and it was  filled with some sort of material.  It really is amazing what the depth rating is for the cost.Hank 


    On Tuesday, November 17, 2015 4:57 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Are these floats hollow, or solid / blown closed-cell plastic?

Sean


On 2015-11-17 16:48, hank pronk via Personal_Submersibles wrote:
> I am not sure I would want to risk an impact with the floats that could
> weaken them and potentially have them fail at depth.  I feel it best to
> have them fully protected under a cowl.  I suspect your right that they
> are tough enough, but I wouldn't want to chance it.  I have seen a
> picture of a DW with about 20 floats tied to the front of the sub.  They
> must have had an over weight item mounted temporarily that needed
> compensating. 
> Hank
> 
> 
> 
> On Tuesday, November 17, 2015 4:30 PM, Sean T. Stevenson via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> I only just now looked up the trawl floats.  I notice that they have a
> depth rating which may match what you need, and you may also be able to
> take advantage of the form factor, instead of viewing it as a
> restriction...  If the floats are available as spheres with a through
> hole, what about mounting an array of them down either side of your boat
> on a round bar which is part of the superstructure to serve double-duty
> as hard fenders?  Placing them outboard like that would increase your
> surface stability as well.
> 
> Sean
> 
> 
> On 2015-11-17 14:03, hank pronk via Personal_Submersibles wrote:
>> Sean,
>> I have looked at building steel buoyancy tanks- they are just to heavy
>> to be effective.  I am trying to keep the sub as light as possible and
>> trawl floats are better than 50% buoyant to weight.  Unless there is a
>> serious risk to using trawl floats, I think they are the most  logical
>> and cost effective choice  at 3 dollars per lb of buoyancy .    I will
>> also have  substantial MBT  volume to offset failed trawl floats.    If
>> I am wrong, please correct me, I would love to have steel tanks,  that
>> is right up my alley.
>> Hank

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