[PSUBS-MAILIST] syntactic foam

[Alan James via Personal_Submersibles]

Hank,what was the cost of the lpg tank per lb of buoyancy.Could you use a number of smaller lpg tanks so as notto put all your eggs in one basket.Your idea of pressurizing them would give additional assurance against crushing.Alan
      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Wednesday, November 18, 2015 12:48 PM
 Subject: Re: [PSUBS-MAILIST] syntactic foam
   
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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