[PSUBS-MAILIST] buoyancy

[Alan James]

Rick,
If you are just concerned about the leaks rather than them crushing,
what about pressurizing them to 300psi internally in a water bath or pool.
I am not sure that because it doesn't leak from inside out it won't leak
from outside in, but it would be better than nothing & a lot less trouble
than taking them out to sea. Also if it did leak it would be easier to see
where it was leaking from.
Alan



________________________________
 From: Land N Sea <landnsea1 at hawaiiantel.net>
To: personal_submersibles at psubs.org 
Sent: Friday, November 8, 2013 8:18 AM
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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