[PSUBS-MAILIST] Build Updates

Tue Jan 5 12:25:06 EST 2021

That was a super video! It's not everyday sub builders manage to get humor
into them.

Alec

On Tue, Jan 5, 2021 at 12:00 PM James Frankland via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi All
>
> We are very lucky at the moment here in Guernsey where we do not have any
> restrictions due to Covid.  We do not have any cases in the wild.  So, i
> have been able to do a couple of dives last summer.
>
> Currently continuing with the rebuild of Skadoc.  Slow progress, but i am
> on the go now each week with no other non sub related projects getting in
> the way.  Also doing my vlog to record progress.  A bit short on content
> for now, but getting there and i am trying to get better at the video
> editing etc.
>
> https://www.youtube.com/watch?v=RGJo0Iv2nAU
>
> Battery pod 2 is nearly complete and I am building a gantry to get Skadoc
> lifted enough to get the pods on.  Then i should be getting somewhere.
> Just thrusters, engine, ballast, drop weights, kitchen sink to go.
>
> Ive also ordered a new trailer to replace the gigantic one that Jodie B
> sits on and takes up half my workshop.  Been waiting 4 months for delivery
> due to Covid.
>
> All the best
> James
>
>
>
>
> On Tue, 5 Jan 2021 at 15:24, Steve McQueen via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> My K-250, "The Great Escape '', came away from it's first trials with an
>> understanding of it's fresh water weight adjustments for neutral buoyancy
>> trim.  A list of 11 sub and 5 trailer items that needed
>> attention/improvement was also identified and are partially completed. I am
>> also working on checklists and procedures as a result of lessons learned.
>>
>> I anticipate more local testing this spring to verify resolution of these
>> identified issues followed by incremental depth tests. Depth testing will
>> be followed by an upgrade of the thrusters and motor controllers bringing
>> the sub to a fully operational status.
>>
>> Once operational I am planning to spend some extended time exploring @:
>> http://www.michiganpreserves.org/whitefish.htm
>>
>> I am also outfitting a 26' support boat to act as a tow vehicle and
>> operational platform for near shore diving operations.
>>
>> In addition I am planning to add to my podcast topics in 2021 interviews
>> with members to discuss their design philosophies and individual projects.
>>
>> Steve
>>
>>
>>
>>
>> On Mon, Jan 4, 2021 at 12:35 PM Cliff Redus via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> 2020 is in our rear view mirrors and 2021 is upon us.  I would love to
>>> hear a short update on Psub community builds. I have heard bits and pieces
>>> on a number of builds but would love an update from members on progress.
>>>  I know Jon Wallace is working away on his boat electronics and his
>>> trailer.  Jon, where are you overall on the build?  Alec has Shackleton
>>> ship shape and has a new articulated arm to play with.  I think he is
>>> pretty far along on a 2021 InnerspaceScience.org 2021 Expedition.  Alec,
>>> any updates?  Gary Boucher has retired from LSU faculty and is busy on a
>>> retrofit of Vindicator.  He is changing out the drive train to articulated
>>> Minn Kotta thrusters, putting the boat on a diet to drop weight and
>>> rebuilding the electronics.  Gary what else have you planned for
>>> Vindicator?  Alan has been busy on custom thrusters for his boat.  Alan,
>>> what the status on the thrusters and what else you been up to.  David
>>> Colombo, how is SeaQuestor coming along?  What's next?  And were are you on
>>> getting your new boat ready to dive?    Carstan, Emile, what's new with
>>> your boats?  I was sorry that Covid 19 wiped out the European Psub events
>>> you guys had planned.  Judging by the PSub list traffic, it sound like Rick
>>> Patton is getting close so sea trials on his new boat.  Rick, can you give
>>> us an update.  I know Steve McQueen has been busy digesting the learnings
>>> from his first dive of The Great Escape last summer.  Steve, what's new
>>> with The Great Escape? When does she go back in the water? Brian Cox I know
>>> has been busy.  We have all been enjoying his video post of dunk test on
>>> his boat.  Brian, what's the latest?  I know that Hugh Fulton is back on
>>> QSub with a new electrical guy on board that is bringing some energy to the
>>> build.  Hugh, any updates on QSub?  New Zealand in the summer might be fun!
>>>
>>> New year is time for goal setting and planning.  I for one would love to
>>> know what the member community is up to.  Jon, any thoughts on the 2021
>>> PSub Convention?  I think we should move forward on this with the
>>> anticipation that the Convid 19 vaccinations will be successful and at some
>>> point we will regain a degree of normalcy.  What about Islamorada Florida
>>> this summer or fall?
>>>
>>> I will give you a brief update on my Psub work.  The R300 is fully
>>> operational and I am just waiting for the dive season to start.  I changed
>>> out the pressure compensation on the thursters from air to oil so am
>>> anxious to see how the thursters work.   I have also started design work on
>>> a new boat I am designating the R800.  It is a low cost atmospheric diving
>>> suit (ADS). The design depth of the boat is 800 feet.  I am trying to make
>>> it ABS compliant as much as possible.  Preliminary engineering is almost
>>> done.  Weight and balance calcs as well as preliminary FEA work on hull and
>>> pods are done.  Am currently working on detailing the electrical boxes and
>>> hull penetrations.  Alec build a OP valve for me that I am currently
>>> testing to document it's cracking pressure and overall depth rating.  I
>>> hope to complete detail engineering by this summer time and start the build.
>>>
>>> Cliff
>>>
>>>
>>>
>>>
>>> On Sunday, January 3, 2021, 03:40:59 PM CST, via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>>
>>> Alan,
>>>
>>>
>>>
>>> Axial scrubber, radial fan..
>>>
>>>
>>>
>>> Emile
>>>
>>>
>>>
>>> *Van:* Personal_Submersibles <personal_submersibles-bounces at psubs.org> *Namens
>>> *Alan James via Personal_Submersibles
>>> *Verzonden:* maandag 28 december 2020 19:41
>>> *Aan:* Cliff Redus via Personal_Submersibles <
>>> personal_submersibles at psubs.org>
>>> *Onderwerp:* Re: [PSUBS-MAILIST] Scrubber design and materials
>>>
>>>
>>>
>>> Following this discussion with interest.
>>>
>>> Emile I thought had an axial type scrubber
>>>
>>> that held something like 10lb of absorbent.
>>>
>>> This would require a lot more power to move the air through maybe 1ft of
>>> absorbent, whereas David has a radial scrubber that only needs to push air
>>> through a 2" section of absorbent. Some good thoughts on power consumption
>>> under load Cliff. I wonder if the load increases as the absorbent is spent
>>> & becomes more soggy. Ie. is there more of a load toward the end of the
>>> dive than at the beginning.
>>>
>>> I am wanting to go with 2 smaller axial scrubbers, mainly to keep the
>>> size down. Am thinking of using an oversized axial fan to keep the noise
>>> down, and have automated speed control based on the CO2 level.
>>>
>>> Alan
>>>
>>>
>>>
>>> On Tuesday, December 29, 2020, 04:39:29 AM GMT+13, Cliff Redus via
>>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>
>>>
>>>
>>>
>>>
>>> The squire gage blower I use on the R300 scrubber is similar the one
>>> Emile has posted.  DC FLATPAKS.qxp (octopart.com)
>>> <https://datasheet.octopart.com/RL90-18-24-EBM-Papst-datasheet-68360.pdf>
>>>
>>>
>>>
>>> Model Papst RL90-18/14N
>>>
>>> Voltage 12-28VDC
>>>
>>> Power 5W
>>>
>>> Noise 58dBA
>>>
>>> Current  .21A
>>>
>>> Air flow  24CFB  at 0 in H20 differential pressure
>>>
>>>
>>>
>>> Note that the flow rate through these fans/blowers are given at 0
>>> differential pressure.  You would need to look at the head curve on the
>>> datasheet to determine the actual flowrate through the fan/scrubber.  It
>>> would be substantially reduced due to the pressure drop through the CO2
>>> absorbent section.   Also to meet ABS rules, you need to size this unit so
>>> the that the current draw is not so great as to pull the emergency battery
>>> down before reaching 72 hours of life support.  On my boat, the hotel load
>>> is about 1.5 amps (life support and comms only).  The emergency battery has
>>> a capacity of 110 Ah at 24V so a 1.5A hotel load will last 73 hours.  I did
>>> a garage test to confirm.
>>>
>>>
>>>
>>> Cliff
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Sunday, December 27, 2020, 11:39:56 PM CST, David Colombo via
>>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>
>>>
>>>
>>>
>>>
>>> Hi Brian, here is the data on the fan. I havent ran any tests yet to see
>>> if the watts rating are at full speed. I am adding a dimmer circuit as well.
>>>
>>>    - Rated Voltage: 12V
>>>    - Rated Current: 1.0A
>>>    - Connecter: XH2.54-2Pin
>>>    - Power: 11W
>>>    - Speed: 3000RPM
>>>    - Air flow:38.5CFM
>>>    - Noise:45dBA
>>>
>>> David
>>>
>>> On Sun, Dec 27, 2020, 6:24 PM Brian Cox via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>> David,          How many watts is the scrubber motor?
>>>
>>>
>>>
>>> Brian
>>>
>>>
>>>
>>>
>>>
>>> --- personal_submersibles at psubs.org wrote:
>>>
>>> From: David Colombo via Personal_Submersibles <
>>> personal_submersibles at psubs.org>
>>> To: Personal Submersibles General Discussion <
>>> personal_submersibles at psubs.org>
>>> Subject: [PSUBS-MAILIST] Scrubber design and materials
>>> Date: Sun, 27 Dec 2020 16:17:51 -0800
>>>
>>> Hi Guys, just completed my scrubber for the VAST sub. Its capacity is
>>> right at 3lbs, based on my rice test. I see I can purchase soda sorb online
>>> but was wanting recommendations on where to purchase it or the draeger
>>> product. Since this is my first scrubber, I have no experience with the
>>> different products.
>>>
>>> David
>>>
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