[PSUBS-MAILIST] syntactic foam

Tue Nov 17 18:14:07 EST 2015

Alan,The problem with that is, if a float did fail you could not find it or maybe not even notice if it did fail.   I think a float rack under the cowling should work.  I am dealing on 4 titanium spheres at the moment.  Each sphere gives 200 lbs buoyancy NET Hank 

    On Tuesday, November 17, 2015 3:51 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,if the trawl floats crushed they would do it one at a time.Maybe make a fiberglass form in the shape you need &fill it with differing sizes of trawl floats. With smaller trawl floats filling thegaps between the bigger ones. Then in stages fill in the gaps with syntactic foam.That should add strength to the trawl floats. I should think the whole unit would be much stronger than it's individual parts, but that's a Sean question:)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 10:03 AM
 Subject: Re: [PSUBS-MAILIST] syntactic foam

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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