[PSUBS-MAILIST] syntactic foam.

Mon Jun 12 18:48:01 EDT 2017

Alan,That is an interesting idea and super simple.  I am just really uneasy with all the hazards.Hank 

    On Monday, June 12, 2017 4:35 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Alan,yes I am red in the face, better put a new battery in my calculator lolHank 

    On Monday, June 12, 2017 4:14 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,if you are getting 3lb of floatation per gallon then you need 184gallons of gas. 184 x 3 = 552 ( near enough).Cheers Alan

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On 13/06/2017, at 9:50 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alan,I need 550 lbs flotation  and one imp gallon of water is 10 lbs and gas is 7 lbs that gives me 3 lbs buoyancy per imp gallon that means I need 1650 gallons of gas.Hank 

    On Monday, June 12, 2017 3:43 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,are you sure that's right!That would give 1900kg of floatation ( nearly 2 ton)That is based on gasoline being .71 of the weight of water. So every litreof gas gives you about 290 grams of floatation. Metric system is much easier for calculating these things.Cheers Alan

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On 12/06/2017, at 11:42 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alan,Those are nice, I can see other uses for them.  If I use gasoline, I would need about  1,750 imperial gallons for Elementary.    I was mistaken about the  liquid paraffin, gasoline is better. 

    On Sunday, June 11, 2017 11:36 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Maybe something like this collapsable plastic fuel tank, inside a protective fibreglass housing, or a grate arrangement.  https://www.bdoutdoors.com/atl-fuel-bladder-extra/Alan
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On 12/06/2017, at 12:28 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alan,Yes I have, it is very simple and effective.  There are of coarse some hazardous logistical problems not to mention environmental concerns.  I would opt for diesel fuel to reduce the fire hazard.  Any time you have plastic and gas it is dangerous.  Last week I did a barge job replacing dock piles.  When I walked up and down the plastic dock floats, every time I touched the steel piles I got a spark.  Actually Liquid paraffin is even better at .8g\ccHank 

    On Sunday, June 11, 2017 5:32 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,have you looked at using gasoline?More volume required for the same floatation as syntactic foam,but apart from the holding tanks it would cost you nothing, as youcould use it after the dive. If you designed right you could fill the tanksat your destination.Alan

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On 12/06/2017, at 6:03 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Greg,that sounds good, I would love to find a more cost effective foam.  I still want to build one more sub that goes much deeper, but the foam cost is not manageable.  I estimate I can build a  Titanic capable sub  for 100,000 and 80,000 of that is foam.  ;-(Hank

    On Sunday, June 11, 2017 8:29 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Greg,There has to be good reason to make foam by other means than standard practices.   Cost would be the biggest reason, and using wax will probably work, but is there a saving?  Using wax means you have to use a deeper rated sphere to offset the loss of reinforcement provided by the resin.  I have no idea what the cost difference would be.  Maybe the cost is still much better.  When I look at Cliff's report, the resin is not the expensive part.  Perhaps the direction should be, to look for a replacement for the spheres.  In Cliff's report it shows the resin triples the sphere's performance.  That implies that the true strength comes from the resin.  Maybe a sawdust resin or a styrofoam granule resin is worth looking at also.  Maybe it is a simple as air entrained resin?Fun to think about anyways.Hank 

    On Sunday, June 11, 2017 6:22 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hi Scott,Thanks for the offer, but I need foam for 3,000 feet.Hank 

    On Saturday, June 10, 2017 9:03 PM, Scott Waters via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,
Hola from Costa Rica!
Depends on if they are glass or carbon fiber spheres and what size they are. They are all pretty durable. We are actually cutting up the foam on Pisces and reattaching it to get the shapes we want. 
I do have a ton of syntactic foam that is cert to 400m that I'd sell you for super cheap. Like all of it for $200
Thanks,Scott Waters

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-------- Original message --------From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> Date: 6/10/17 12:38 PM (GMT-06:00) To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> Subject: [PSUBS-MAILIST] syntactic foam. 
I have an idea, but not sure if it will work.  My idea is to fill a neutrally buoyant container with macro and micro spheres.  After the container is as full as possible, then fill with an environmentally friendly oil.  This would be more buoyant than using a resin and less complicated and cheaper.  My concern is, how well will the spheres stand up against breaking from being in contact with the other spheres and the container.   Are these spheres delicate?  Hank_______________________________________________
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