[PSUBS-MAILIST] instruments, pressure display?

[hank pronk]

I just did a potting experiment, I removed the main  electric penetrator from my little yellow sub and pressure tested it to 1,000psi.  I left it over night and it held 1,000psi with no leaks.  That penetrator is my standard simple threaded rod in poly urethane.  I tried the same technique with 11 bare wires except I started with 5min epoxy for the first .75in  just to seal it to hold the very slow curing poly urethane from leaking out.  Well it failed at 1,000psi, I am not sure if is the small wire versus the larger threaded rod.  More testing :-) 
Hank 



On Saturday, December 21, 2013 10:45:39 PM, Joe Perkel <josephperkel at yahoo.com> wrote:
  
Jon,

As a diver I would say depth. The reason being that in a blow and go scenario you need to know that last depth and time to blow down to know your bottom time for what would be hopefully, a controlled ascent. Think USN dive tables.

This is a big reason why I think I personally would limit my own personal maximum operational depth to 250' with a practical use somewhat less. I might design for a 1,000', but I'm not going there. I really don't think I would like to go any deeper than say something like the Andrea Doria in a homebuilt non certified sub. Conversely, I'd do Titanic in Alvin, Mir, or Nautile in a heartbeat if I got the chance.

Pay close attention to that next 25 story building you stand next to and picture yourself ascending from street level to the roof line. You may need to stop at the 24th floor for a while, if you can control that last ten
 feet that is.

Joe



Sent from Yahoo Mail for iPad  



________________________________
 From:  Jon Wallace <jonw at psubs.org>; 
To:  Personal Submersibles General Discussion <personal_submersibles at psubs.org>; 
Subject:  [PSUBS-MAILIST] instruments, pressure display? 
Sent:  Sun, Dec 22, 2013 3:34:24 AM 
 


I will be displaying depth in feet.  Is there any practical reason to 
also display pressure?  It's easy enough for me to do so but it seems 
superfluous.  Which do you prefer, depth indicator or pressure 
indicator, and why?
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