[PSUBS-MAILIST] Gamma buoyancy

Wed May 7 22:28:24 EDT 2014

Jim,
Thank you,
When I flood my mbt's I stop venting when water is just over the hatch window.  It is sinking at that stage, very slowly.  As I sink I just give a shot of air to compensate for the bubble compressing.  I like to sink ass heavy so I do all my control with the front mbt.  When the bottom comes in sight I give a good squirt  of air and it stops before hitting the bottom, not always mind you.  That is where practise comes in. Also as the air supply diminishes, the squirt needs to be longer because Gamma has no regulator. To hover is easier if you hit the bottom, you just keep giving tiny shots of air until she lifts off the bottom.  That makes a mess of the visibility though.  I have no idea what the sink rate was, I was having to much fun trying everything out to notice.
Hank
On Wed, 5/7/14, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: [PSUBS-MAILIST] Gamma buoyancy
 To: personal_submersibles at psubs.org
 Received: Wednesday, May 7, 2014, 10:05 PM

 Hank,

 That pic of Gamma by the dock
 makes me drool.  
 Absolutely beautiful!

 If I understand correctly, you loaded
 ballast so that when 
 your MBTs are fully flooded, you're 10 lb
 negative.  What was your 
 technique for arresting your sink rate and hovering? 
 About how many feet 
 above your target depth did you initiate "stop
 sink?"  Do you know 
 what your sink rate was at -10 lb?

 Cheers,
 Jim T. 

 In a message dated 5/7/2014 7:31:43 P.M. Central
 Daylight Time, 
 personal_submersibles at psubs.org writes:
 Hi 
   Joe,
 Thank you, 
 Gamma does not have a VBT.  When I had Gamma at 
   the correct weight (10 lbs heavy) it was easy peezy to
 hover, the trick is to 
   control descent without hitting bottom.  That just
 takes practise, by the 
   time I was out of air I pretty well had it.  This sub
 is so easy to 
   operate, my friend was able to dive Gamma with a 2 min
 lesson.  I have to 
   admit Vance was right and I was wrong.  VBT is a
 waste of time.  
   Also it is more fun to operate a sub without a VBT because
 you actually 
   control it constantly until your at 
   depth.

 --------------------------------------------
 On Wed, 5/7/14, 
   Joe Perkel via Personal_Submersibles
 <personal_submersibles at psubs.org> 
   wrote:

 Subject: Re: [PSUBS-MAILIST] (no subject)
 To: "Personal 
   Submersibles General Discussion" 
   <personal_submersibles at psubs.org>
 Received: Wednesday, May 7, 2014, 
   8:16 PM

 Hank, Gamma
 doesnt have a VBT does it?  Can you 
   speak to the
 virtues of fine depth control without
 one? What a 
   beautiful
 boat! Joe 
      On Wednesday, May 
   7,
 2014 6:33 PM, hank pronk via 
   Personal_Submersibles
 <personal_submersibles at psubs.org> 
   wrote:
      Alan,
 Thank you, I am pleased with the 
   outcome. 
   I do need to put a proper paint job on it 
   still.  
 I guess it is time to start thinking about what
 is next to 
   build.
 Hank
 --------------------------------------------
 On Wed, 
   5/7/14, Alan James via
 Personal_Submersibles 
   <personal_submersibles at psubs.org>
 wrote:

   Subject: 
   Re:
 [PSUBS-MAILIST] (no subject)
   To:
 "Personal Submersibles 
   General Discussion"
 <personal_submersibles at psubs.org>

   Received: Wednesday, May 7, 2014, 6:22 PM

   Looks a 
   really
   nice boat sitting there in the water
 Hank.Here's your 
   photo

 linkhttp://www.psubs.org/projects/1327775450/gammarestoration/

   Alan

    From: hank pronk 
   via

 Personal_Submersibles

   <personal_submersibles at psubs.org>
   To:

   personal_submersibles at psubs.org 
   Sent: Thursday, May 8, 
   2014
   10:11 AM
   Subject:
 [PSUBS-MAILIST] (no

   subject)

   I
 just added pictures of my 
   test dive to Gamma
   restoration.  You can see Gamma has 
   great
 freeboard,
   and this is with 200 lbs to 
   much
 ballast.  I am
   real
   tired of subs being to 
   light to sink,
 so I went the other
   way and made 
   it
 heavy.  I dove it then remove weight

 about 5 times to get it 
   just right.  In the end
 Gamma
   was 10 lbs heavy.  Much 
   easier
 to control descent with
   the proper weight
 :-)

   Hank

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