[PSUBS-MAILIST] Build Updates

Mon Jan 4 14:08:36 EST 2021

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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