[PSUBS-MAILIST] Gamma test dive

Sat Aug 9 07:43:20 EDT 2014

I'm happy to hear that things are smoothing out. The MBT air trick is like magic, right? The old Perry boats had very elaborate variable ballast systems, custom under deck tanks, 4-piston pumps, all SS valving and plumbing, etc. And of course we used it to find that sweet spot you mentioned and then pretty much ignored it afterwards.
Vance

-----Original Message-----
From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Sat, Aug 9, 2014 7:28 am
Subject: Re: [PSUBS-MAILIST] Gamma test dive

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 
 >   
 > 
 > 
 > 
 >
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 >    Personal_Submersibles at psubs.org
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 >

 >  
 > 
 >   
 > 
 > 
 > 
 >
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