[PSUBS-MAILIST] buoyancy

[Smyth, Alec]

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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