[PSUBS-MAILIST] syntactic foam.

Fri Jun 23 11:27:58 EDT 2017

Actually there are trawl floats rated to 1800m. That should have you
covered Hank! Check out #629 below.

http://trawlworks.com/floats.html

Best,

Alec

On Mon, Jun 19, 2017 at 1:21 PM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> These guys have 14" spherical buoys rated to 800 meters   - $120.00
> with a positive buoyancy of 39 #    they are not syntactic.  The syntactics
> start at 30" in dia
>
>
> http://www.mooringsystems.com/buoyancy.htm
>
>
>
> Brian
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: james cottrell 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: Mon, 19 Jun 2017 16:52:56 +0000 (UTC)
>
> Deep sea glass floats are rated for 10,000 psi
>
> http://teledynebenthos.com/product/flotation_instrument_
> housings/flotation-glass-spheres
>
> Greg
>
>
> ------------------------------
> *From:* Alan via Personal_Submersibles <personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> *Sent:* Monday, June 12, 2017 6:18 PM
> *Subject:* Re: [PSUBS-MAILIST] syntactic foam.
>
> Hank,
> if you are getting 3lb of floatation per gallon then you need 184
> gallons of gas. 184 x 3 = 552 ( near enough).
> Cheers Alan
>
> Sent from my iPad
>
> 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 litre
> of gas gives you about 290 grams of floatation.
> Metric system is much easier for calculating these things.
> Cheers Alan
>
> Sent from my iPad
>
> 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
>
> Sent from my iPad
>
> 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\cc
> Hank
>
>
> 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 you
> could use it after the dive. If you designed right you could fill the tanks
> at your destination.
> Alan
>
> Sent from my iPad
>
> 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
>
>
>
> Sent from my U.S. Cellular® Smartphone
>
> -------- 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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