[PSUBS-MAILIST] buoyancy

[Land N Sea]

I thought I had some lengths of 4” X 4” laying around but was wrong so I used some 2” X 4”’s which I had plenty of and it took 25 feet of  2” X 4” lumber to make it neutral which looks like about 48.46 cu in of wood buoy 1 lb after the lead is submerged as well as the displacement of the wood. I am sure I will loose some buoyancy from the wood at depth but not enough to make it a hassle to haul back in by hand. If the pod floods then it’s plan B, using some lift bags in stages to get her back. I’ll let ya all know how they tested out.

Rick

From: hank pronk 
Sent: Saturday, November 09, 2013 7:42 AM
To: Personal Submersibles General Discussion 
Subject: Re: [PSUBS-MAILIST] buoyancy

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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