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

Sun Dec 15 16:35:30 EST 2013

Rick,  Tried to contact you off line but it bounced back
Brian
-----Original Message-----
From: "Land N Sea" <landnsea1 at hawaiiantel.net>
Sent 12/8/2013 10:45:55 AM
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] G.L. Summary Stability & BuoyancyHank,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 pronkSent: Sunday, December 08, 2013 3:16 AMTo:Personal Submersibles General
DiscussionSubject: 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?HankOn 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 pronkSent: Saturday, December 07, 2013 1:19 PMTo:Personal
Submersibles General DiscussionSubject: 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.HankOn 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 SuhrSent: Thursday, December 05, 2013 4:53 PMTo:Personal
Submersibles General DiscussionSubject: 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.  HankOn 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 &
BuoyancyVance,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 & BuoyancyThe minimum hatch to waterline measure applies to those submersibles
‘intended to be entered while afloat’ - Phil From:Jon
WallaceSent: Thursday, December 05, 2013 7:33 AMTo:Personal
Submersibles General DiscussionSubject: 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
definedin the following unless special operational restrictions reflected in
the classnotification allow a lower level. & ...Depending on the type of
submersible & the operation area, the distance between the waterline in fully surfaced
conditionand the upper edge of entrance openings, air pipes,etc. which may be
openfor 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 tobe 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 heelingangles. 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
pressurehull 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
withoutwater
coming in & the heeling angle shouldn't exceed 22,5
degrees.There is
an operational in water test at the end of construction with
evaluationof the
center of gravity upon which the pre build calculations were
based.Alan   _______________________________________________
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