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

Thu Dec 5 21:53:19 EST 2013

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 <jonw at psubs.org>
> *Sent:* Thursday, December 05, 2013 7:33 AM
> *To:* Personal Submersibles General Discussion<personal_submersibles at psubs.org>
> *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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