[PSUBS-MAILIST] buoyancy

[hank pronk]

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  
Sent: Friday, November 08, 2013 8:25 PM 
To: Personal Submersibles General 
Discussion  
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> 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] On Behalf Of Land N Sea
>Sent: Thursday, November 07, 2013 2:18  PM
>To: 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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