[PSUBS-MAILIST] syntactic foam

Tue Nov 17 16:03:50 EST 2015

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

     On Tuesday, November 17, 2015 9:19 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 I was referring to Cliff's suggestion that you fabricate steel pressure vessels as permanent buoyancy, as opposed to using foam at all.Sean

On November 16, 2015 5:56:58 PM MST, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Yes, trawl floats as Macro spheres.Hank 

     On Monday, November 16, 2015 5:36 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 He might have been on to something wrt fabricating b! uoyancyvessels.Sean

On November 16, 2015 5:19:13 PM MST, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Just had a look at Cliff's  PDF on Syntactic foam.   Wow very nice!  and there is a cost breakdown I see.  It is much cheaper than buying but still twice the cost of trawl floats.  Hank 

     On Monday, November 16, 2015 5:05 PM, hank pronk via Personal_Submersibles<personal_submersibles at psubs.org> wrote:

 Alan,Yes I could save a few bucks and look good at the same time :-)  I doubt I could make foam for less than trawl floats but maybe Cliff has a cost per lb buoyancy.   There is syntactic foam available that you mix together into your own mould also.  I am also still woking on the titanium spheres.   I have time to sort it out.Hank 

     On Monday, November 16, 2015 5:01 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,you could go on a diet :)There is this pdf on making syntactic foam by Cliffhttp://www.psubs.org/design/PDF/SyntacticFoam.pdf
I went to Alvins 50th Birthday party in New Orleans.They said the syntactic foam on it cost $3million. That included all the pressure testingof the individual segments.Alan
      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion<personal_submersibles at psubs.org> 
 Sent: Tuesday, November 17, 2015 12:39 PM
 Subject: [PSUBS-MAILIST] syntactic foam

Yikes! syntactic foam is costly.  Syntactic foam for 1,000M is 8 dollars per pound buoyancy- trawl floats are 3 dollars per lb buoyancy.    I need almost 1,000 lbs buoyancy.Hank
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