[PSUBS-MAILIST] G.L. Summary Stability & Buoyancy

Sun Dec 8 13:45:55 EST 2013

Hank,
I forgot if you mentioned it or not but had that port been annealed before testing?
My main ports are 8” X 1 1/4”. It’s hard to say percentage wise how far I am along as each phase is different labor wise plus not have built one before, it’s hard to put a value to it but,,,,,,,,,,,hull seam and all frames and 4 view port rings in and fully welded, threw hulls for side motors, steering linkage, drop weights and VBT vent and flood are in, lower ring for conn in, upper ring for conn including 4 view port rings, threw hulls for MBT dump, snorkel and hatch dogs done and ready to weld to lower ring already on hull, hatch done and ready to install, both battery pods are completely done and I have decided to take them out and individually test them to 600’ before attaching them to the hull as I have 3 places in each pod that have O rings where a leak could occur unlike the construction drawings, so I want the option of getting them in a lathe to correct any warpage  if need be as once they are on the hull no can do. Front dished end has large view port ring installed, rear dished end has the 2” flood nipple in all steel has been sand blasted and primed, I have the three Minn-Kotas but still need to modify them, VBT is done and ready to mount. I also have the depth sounder, U/W comms, gas chromatograph, scrubber and O2 cleaned first stage reg as well. It sounds like I have done a lot but then when I think of what is still left to do, it really doesn’t. I guess if it were easy everybody would be doing it.

Rick

From: hank pronk 
Sent: Sunday, December 08, 2013 3:16 AM
To: Personal Submersibles General Discussion 
Subject: Re: [PSUBS-MAILIST] G.L. Summary Stability & Buoyancy

Rick,
The ports for Gamma are 1.5in thick and 8.5in dia.  What stage are you at with your build?
Hank

On Saturday, December 7, 2013 7:30:03 PM, Land N Sea <landnsea1 at hawaiiantel.net> wrote:

What was the thickness and diameter of the one you tested? I'm  good on ports and am going to send all mine to Greg for annealing but it’s good to know you have them for the future if need be.

Rick

From: hank pronk 
Sent: Saturday, December 07, 2013 1:19 PM
To: Personal Submersibles General Discussion 
Subject: Re: [PSUBS-MAILIST] G.L. Summary Stability & Buoyancy

Hi Rick,
I only tested one so far.  I tested a damaged window that you would never use and it was fine to 500psi.  I am sure they will all test fine.  I am also having them buffed first to restore them.  Do you need some window by chance.  I have a box full of new windows  that I have not even unpacked.
Hank

On Saturday, December 7, 2013 4:13:05 PM, Land N Sea <landnsea1 at hawaiiantel.net> wrote:

Hank,
Did you do the testing on your acrylic view ports yet and if so how did they do?

Rick

From: Douglas Suhr 
Sent: Thursday, December 05, 2013 4:53 PM
To: Personal Submersibles General Discussion 
Subject: Re: [PSUBS-MAILIST] G.L. Summary Stability & Buoyancy

Hank, what are the specs on your new motor? 

On Thu, Dec 5, 2013 at 8:23 PM, hank pronk <hanker_20032000 at yahoo.ca> wrote:

  Brian,
  I will be finished the assembly in a few days. I will post a picture when it is all together. I need the new motor before I can complete it.  
  Hank

  On Thursday, December 5, 2013 6:17:06 PM, brian <brian at ojaivalleybeefarm.com> wrote:

  It would be nice to see a schematic of this assembly or a picture since I'm not really grasping what is going on with the seal and bearing assembly.

  Brian

  -----Original Message-----
  From: "hank pronk" <hanker_20032000 at yahoo.ca>
  Sent 12/5/2013 11:12:31 AM
  To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
  Subject: Re: [PSUBS-MAILIST] G.L. Summary Stability & Buoyancy

  Vance,
  Funny you mention the inner tube.  I did just that as an experiment on my red sphere sub.  I even painted the inner tube white so it would blend in better.  
  I took a big leap of faith this morning, I just finished machining the prop shaft bushing housing.  The housing has a bearing and seals now.  I drilled in two ports (1/8 pipe) to fill and drain the oil.  I like it much better and I have to drain the oil regularly in the second shaft housing anyways.  
  I also decided to buy a new motor instead of using the original.  I am driving to the USA tomorrow to pick it up.  That was my Christmas present. :-)    I am very easy to shop for :-)
  Hank 

  On Thursday, December 5, 2013 10:47:14 AM, "vbra676539 at aol.com" <vbra676539 at aol.com> wrote:

  Which suggests a big inner tube if you want to convert a DW2000 to that definition. Otherwise, keep the door shut, or prepare to swim. 
  Vance

  -----Original Message-----
  From: Phil Nuytten <phil at philnuytten.com>
  To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
  Sent: Thu, Dec 5, 2013 11:11 am
  Subject: Re: [PSUBS-MAILIST] G.L. Summary Stability & Buoyancy

  The minimum hatch to waterline measure applies to those submersibles ‘intended to be entered while afloat’ - 
  Phil

  From: Jon Wallace 
  Sent: Thursday, December 05, 2013 7:33 AM
  To: Personal Submersibles General Discussion 
  Subject: Re: [PSUBS-MAILIST] G.L. Summary Stability & Buoyancy

  I think the first sentence is key, "Submersibles will be assigned Class only after it has been demonstrated that their buoyancy and their static and dynamic stability in in tact condition is adequate FOR THE SERVICE INTENDED".  Some of the lack of specificity is because they can't conceive of every possible application.  They do however have quite a few specifics as you outlined.  Some of the testing won't apply (ie fuel load) and it's possible that a narrow scope of service might lower number of tests required.

  On 12/5/2013 4:08 AM, Alan James wrote:

    I'm afraid there is nothing simple in this section. It is lacking in a lot of specifics.
    There are statements such as "shall generally meet the standard defined
    in the following unless special operational restrictions reflected in the class
    notification allow a lower level. & ...Depending on the type of submersible & the 
    operation area, the distance between the waterline in fully surfaced condition
    and the upper edge of entrance openings, air pipes,etc. which may be open
    for surfaced operation, has to be approved by G.L.
       ABS has a minimum distance from the waterline to the hatch opening of 30"
    whereas G.L. states; For surfaced; a minimum distance between metacentric height & center of gravity of 10cm. (4") And for submerged, a minimum distance between center of buoyancy & center of gravity of 5cm (2") (same as ABS). At no stage will G be above B. (including after dropping the drop weight)
    In the initial paper work sent before construction, a detailed analyses of stability is to
    be included.  This takes the form of analyzing the heeling levers of 10 different load cases in fresh & salt water, 6 on the surface & 4 submerged & at 6 different heeling
    angles. So looks like 120 calculations. Heeling forces from free liquid surfaces, turning circles, wind, ice loads, transference of equipment & personal & payloads from working devices have to be considered.
    There needs to be sufficient ballast to keep a minimum of 10% of the pressure
    hull out of the water. The draught line has to be marked on the hull. 
    When one major ballast tank is damaged the hatch has to be able to open without
    water coming in & the heeling angle shouldn't exceed 22,5 degrees.
    There is an operational in water test at the end of construction with evaluation
    of the center of gravity upon which the pre build calculations were based.
    Alan

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