[PSUBS-MAILIST] Build Updates

Mon Jan 4 13:41:44 EST 2021

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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