[PSUBS-MAILIST] buoyancy

[Jon Wallace]

That's pretty close...I calculated 524 feet with 125psi internal and 
suspect you could push it to 600 feet.  But that would be the limit so 
you'd want to build in a safety factor or risk failure at depth.


On 11/9/2013 12:42 PM, hank pronk wrote:
> Hi Rick,
> I have used 20lb propane tanks for buoyancy.  I think they give 35lb 
> buoyancy and if you pressurize them to 125psi I am sure they could go 
> to 600 ft.  Test one first.
> Hank
>
>
> On Saturday, November 9, 2013 10:16:57 AM, Land N Sea 
> <landnsea1 at hawaiiantel.net> wrote:
> Hi David,
> any idea what the two floats provide in buoyancy?
> Rick
> *From:* David Colombo <mailto:seaquestor at gmail.com>
> *Sent:* Friday, November 08, 2013 8:25 PM
> *To:* Personal Submersibles General Discussion 
> <mailto:personal_submersibles at psubs.org>
> *Subject:* Re: [PSUBS-MAILIST] buoyancy
> Hi Rick, here is a quote on the floats I just got.  The 551 float is 
> $10.80 ea., less 10% per carton of 18. The 364 float is $6.00 ea., 
> less 10% per carton of 72. I will be ordering some of each, but not 
> enough for 18 or 72.
> David Colombo
> On Nov 7, 2013 12:02 PM, "Smyth, Alec" <Alec.Smyth at covisint.com 
> <mailto:Alec.Smyth at covisint.com>> wrote:
>
>     Hi Rick,
>     If you need some cheap buoyancy that will go to significant
>     depths, I'd recommend fishing floats you can get here:
>     http://trawlworks.com/floats.htm
>     I guarantee you'll find uses for them afterwards, whether it's as
>     emergency release buoys, mooring buoys, or whatever.
>     Best,
>
>     Alec
>     *From:*Personal_Submersibles
>     [mailto:personal_submersibles-bounces at psubs.org
>     <mailto:personal_submersibles-bounces at psubs.org>] *On Behalf Of
>     *Land N Sea
>     *Sent:* Thursday, November 07, 2013 2:18 PM
>     *To:* personal_submersibles at psubs.org
>     <mailto:personal_submersibles at psubs.org>
>     *Subject:* [PSUBS-MAILIST] buoyancy
>     I was thinking of testing both my battery pods to 600' before I
>     weld them to the hull so that if there are any issues with leakage
>     I would still be able to get them on a lathe. I added two vents
>     per pod with O rings so that I can push/suck air across the
>     batteries while charging so there are a couple of more places for
>     leaks to occur. I did the calks' and they weigh in at 295 LBS.
>     each dry with a negative displacement of around 30 lbs. I was
>     hoping that they would barley float with no batteries in them so
>     that I could weight them just slightly negative for ease of
>     launching and retrieving but that's not the case. I need to come
>     up with about 30 lbs. of positive buoyancy and don't have any
>     syntactic foam so I figured I could strap some 4" X 4", on them to
>     achieve that. This may be a dumb question but does anyone happen
>     to know the per foot buoyancy of a 4" X 4" in sea water? If not
>     I'll head down to the ocean and start testing.
>     I also mentioned the other week about my desire to omit the plate
>     that is welded to the pressure hull and battery pod of a K-350 and
>     was wondering if any one could comment on that.
>     Rick
>
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