[PSUBS-MAILIST] Build Updates

Mon Jan 4 16:13:19 EST 2021

Hi Rick,

Shackleton's arm is basically Hank's design with a few small changes. You
must have missed the announcement, we uploaded the blueprints to PSUBS so
anyone can build it.

http://www.psubs.org/community/projects/

Best,
Alec

On Mon, Jan 4, 2021 at 2:09 PM Rick Patton via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alec
>
> Which arm are you using? is it the one Hank designed and built or a
> different one?
>
> Rick
>
> On Mon, Jan 4, 2021 at 8:42 AM Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> What a good idea Cliff!
>>
>> My update is relatively simple. Shackleton has the arm and also I put in
>> a "diver recall system" from OTS. It's a hydrophone that allows you to
>> listen to ambient sounds, as well as functioning as a speaker to
>> communicate with nearby divers or subs that have no comms gear. Basically
>> it's a 120 watt speaker in the water, and is supposedly audible for 100m
>> with voice and 300m using a tone. We shall see, however, how well it works.
>> The challenge is that, in listening mode, it hears its own speaker in the
>> sub and if the volume is turned up too much you get a feedback loop (a very
>> loud screech.) I could solve the issue by wearing headphones in the sub,
>> but prefer not to do that. After lots of experimentation, I've got to where
>> I can run the volume at 75% without triggering feedback, but that is while
>> sitting on the driveway. As water conducts sound much better than air, I
>> expect ihe feedback to happen earlier in the water.
>>
>> I'm now building a slurp gun (suction sampler.) We have an Innerspace
>> Science expedition planned to Sebago Lake in Maine, together with Brian
>> Hughes and his sub Harold, in collaboration with St Joseph's University of
>> Maine. It's just a matter of when Covid will allow us to go, with the
>> expected date being in the late summer or early fall. Before that, I will
>> need to do a depth test, most likely in Seneca Lake.
>>
>> Best,
>> Alec
>>
>> 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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