[PSUBS-MAILIST] alternative syntactic foam

[hank pronk via Personal_Submersibles]

Hi Emile,I have 30 trawl floats on Elementary now, the problem is they do not have the safety margin.  The floats are inside the MBT. Hank 

    On Monday, June 19, 2017 5:42 AM, emile via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 #yiv1955173842 #yiv1955173842 -- _filtered #yiv1955173842 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv1955173842 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv1955173842 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv1955173842 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv1955173842 #yiv1955173842 p.yiv1955173842MsoNormal, #yiv1955173842 li.yiv1955173842MsoNormal, #yiv1955173842 div.yiv1955173842MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv1955173842 a:link, #yiv1955173842 span.yiv1955173842MsoHyperlink {color:blue;text-decoration:underline;}#yiv1955173842 a:visited, #yiv1955173842 span.yiv1955173842MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv1955173842 span.yiv1955173842E-mailStijl17 {color:#1F497D;}#yiv1955173842 .yiv1955173842MsoChpDefault {font-size:10.0pt;} _filtered #yiv1955173842 {margin:70.85pt 70.85pt 70.85pt 70.85pt;}#yiv1955173842 div.yiv1955173842WordSection1 {}#yiv1955173842 Hi Hank, all  No foam but a spherical trawlerfloat can be a alternative float.Not expensive and some can go to 1000 m /3000 ft. !  Br, Emile  Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] Namens hank pronk via Personal_Submersibles
Verzonden: maandag 19 juni 2017 2:19
Aan: Personal Submersibles General Discussion
Onderwerp: [PSUBS-MAILIST] alternative syntactic foam  Hi All,Just been thinking  about low cost ways to make foam.  I am sure at the end of the day, I will make my foam the standard way, but it is still an interesting subject to explore.  I have learned that microspheres are added to many things, even concrete.  That got me thinking, if the compressive strength is there, the best product to reinforce the spheres should be the lightest possible material.  Polypropylene is very light and has a compressive strength of 6,000 psi.  The fun part about Polypropylene is, it can be recycled from bottle lids etc.  I don't think it would take to much imagination to build an oven with a mixer inside and a microsphere injection port.  Polypropylene has a specific gravity in the neighbourhood of .7g\cc that means a light weight foam can be made with microspheres and no macro spheres.    I don't know about the water absorption properties yet.Hank_______________________________________________
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