[PSUBS-MAILIST] buoyancy

[hank pronk]

I am sure you could push the pressure to 150psi.
Hank



On Saturday, November 9, 2013 4:08:28 PM, Jon Wallace <jonw at psubs.org> wrote:
  

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 mailto: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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>>
>>  
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