[PSUBS-MAILIST] Gamma test dive

Sat Aug 9 07:28:14 EDT 2014

Vance,
I have to admit, you were right about how easy it is to operate.  I also find it more fun and interactive than using a VBT.  The trick seems to be, to have the weight of the sub in the sweet spot.  I just got lucky and had the weight perfect right from the start.  I mean I had it calculated just perfect :-)
Now that I know this will happen, I will simply turn on my emergency air supply and give a little shot of air to return to my set point.  When the cabin pressure has risen in past tests, I hit the air compressor for a couple of seconds and it is corrected right away.
The onboard air compressor was a savior at the lake.  I was able to refill both hp tanks at the dock.  I used four tanks of air.
I had zero leakage from windows ect.  The hatch seal leaks at the very start but stops right away when I dive.  The hatch dogs need to be built up with some weld.  The dogs are new but the CT has grooves worn into the steel from being closed a million times or so.
Hank

On Fri, 8/8/14, Vance Bradley via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Gamma test dive
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Friday, August 8, 2014, 11:20 PM

 Hank,
 I
 might drop 2 inches of vacuum from deck temperature to
 submerged. Call it 0.5 psi. It was always that cooling
 effect that did it. I normally let the hull chill for 5-10
 minutes then reset the zero point, as we used the barometer
 for an eyeball pressure indicator for CO2 build up and draw
 down (ran the scrubber about 15 minutes/hour).
 Vance

 Sent
 from my iPhone

 > On Aug
 8, 2014, at 10:15 PM, hank pronk via Personal_Submersibles
 <personal_submersibles at psubs.org>
 wrote:
 > 
 > 
 > Pete LOL I had it right, I am going to
 bed--------------------------------------------
 > On Fri, 8/8/14, hank pronk via
 Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:
 > 
 > Subject:
 Re: [PSUBS-MAILIST] Gamma test dive
 > To:
 "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 > Received: Friday, August 8, 2014, 10:13
 PM
 > 
 > 
 > Pete,
 > sorry I meant 2
 lb positive, can you tell I have been on the
 > road for 6 hr and diving for 6 hr. 
 ;-)
 >
 --------------------------------------------
 > On Fri, 8/8/14, hank pronk via
 > Personal_Submersibles <personal_submersibles at psubs.org>
 > wrote:
 > 
 >  Subject: Re:
 >
 [PSUBS-MAILIST] Gamma test dive
 > 
 To:
 > "Personal Submersibles General
 Discussion" <personal_submersibles at psubs.org>
 >  Received: Friday, August 8, 2014, 10:01
 PM
 > 
 > 
 >  Pete,
 >  I have
 Gamma about 2 lb negative I dump all
 >
 the
 >  air in the ballast tanks, then
 start
 > sinking.  As I am
 >  sinking, I just give a
 > swirt of air, with some practice I am
 >  able
 > to stop and
 hover.  It is way easier than I though it
 >  would be.  
 > 
 >
 Hank--------------------------------------------
 >  On Fri, 8/8/14, Pete Niedermayr via
 >  Personal_Submersibles <personal_submersibles at psubs.org>
 >  wrote:
 > 
 >  
 > Subject: Re:
 >  [PSUBS-MAILIST] Gamma test
 > dive
 >   To:
 > 
 "Personal
 > Submersibles General
 Discussion" <personal_submersibles at psubs.org>
 >   Received: Friday, August 8,
 2014, 9:46 PM
 >   
 >   
 >  
 > Hank,
 >   How you stopping and
 hovering. Are
 > you
 >  weighted to  neutral
 >   buoyancy?Are you
 >  riding the
 > bubble?
 Doesn't Gamma use
 > 
 >  forward motion and a dive plain for
 depth
 > control?
 >   
 >   Pete 
 >   
 >  
 >
 -------------------------------------------
 >   On Fri, 8/8/14, hank pronk
 via
 >   Personal_Submersibles
 <personal_submersibles at psubs.org>
 >   wrote:
 >   
 > 
 >  
 >  Subject:
 [PSUBS-MAILIST]
 >   Gamma test
 dive
 >    To: personal_submersibles at psubs.org
 >    Date: Friday, August 8, 2014, 7:45
 PM
 >    
 >   
 Today I dove Gamma
 > to
 >  95
 >   feet in
 >    Kimbasket
 >  Lake
 (bush
 > Harbour)  the
 >   visibility was
 >    awful.
 >   
 > 
 > 
 >  Maybe 2 feet at
 best.  Big mystery
 > though, when I
 dive
 >    to 95 feet, in a
 > matter of 5 min the
 > 
 pressure
 >   inside drops
 >    by
 >  500 feet. 
 The pressure
 >  
 >
 stays right on
 >  perfect until
 >    I go deeper. 
 >   My
 >
 theory, the water is glacier fed, very
 >  
 > 
 >   cold at depth causing the
 >  temp inside the sub to drop,
 > 
 >   creating
 >  negative pressure.  Could that
 > be
 >   it?

 >    Vance, did
 >
 that happen in the north
 >   sea?  
 >    On a positive note,
 >  I can
 > stop in
 >   the water Colum at any
 >    depth and hover.  I
 >  
 > can
 >  surface and stop at ten feet
 >    and
 >   hover.
 > 
   Hank 
 >   
 > 
 > 
 > 
 >
 _______________________________________________
 >    Personal_Submersibles mailing list
 >    Personal_Submersibles at psubs.org
 >    http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
 >

 >  
 > 
 >   
 > 
 > 
 > 
 >
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