[PSUBS-MAILIST] syntactic foam

[hank pronk via Personal_Submersibles]

Alan,The CNG tanks vary in price depending on time left on them before they are out of date.   I can get two tanks that will do the job for 1,000 dollars US  that are road legal for another couple years at 3,600 psi.  

Brian,I think I need around 800 lbs buoyancy.Hank 


    On Tuesday, November 17, 2015 10:06 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Actually was is pretty lousy , just slightly buoyant in water.   learned about wax solenoids however!    Hank,  How much buoyancy do you need? Brian Cox  

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] syntactic foam
Date: Wed, 18 Nov 2015 03:43:23 +0000 (UTC)

Brian,I did look at gasoline and diesel but there is not a big difference in density, so it takes a lot of gas to create the buoyancy I need.I never thought of wax, what is the density?  boy that would be great if it has a low density.Hank 


    On Tuesday, November 17, 2015 7:12 PM, Private via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 They are hollow, but very thick-walled. I've been using them for years on Snoopy and they've worked out so well, the new sub uses way more of them.

Best,

Alec



> On Nov 17, 2015, at 6:56 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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