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[PSUBS-MAILIST] New Zealand Diving



haha...I also love great visibility, at the poor knight islands the vis at this time of year for next 2 months or so is about 80-100 feet also, it is not uncommon to get 35 feet or less closer to our coastline but it is generally pretty good at this time of year, usually the winter is far better than in the summer months...I will miss diving these waters very much, however am looking forward to exploring other countries and meeting like minded people to run my conceptual drafts by.
 
Have you got photos posted of your psub??? tell me about it please.
 
Leon Ducrot
----- Original Message -----
Sent: Thursday, September 07, 2006 6:44 PM
Subject: Re: [PSUBS-MAILIST] Sodium Polyacrylate

Leon - I'm a vis fanatic - talk to me: What's the vis in your area?  We get well over 80 - 100 feet up here in the winter.
 
I was diving in Tonga in Sept. of '89 - vis was a mediocre 35 feet or so.
 
Rick L
----- Original Message -----
Sent: Wednesday, September 06, 2006 11:23 PM
Subject: Re: [PSUBS-MAILIST] Sodium Polyacrylate

Thank you, the amperage draw is indeed very relevant, an a/c unit from a vehicle is usually driven for the front pulley and doesnt draw amps from batteries directly, the extra horsepower required to drive the a/c pump through the high pressure side to the low pressure does make the motor work harder, therefore drawing more from batteries in a d/c driven system....exactly how much this extra drag creates depends on things like the size of the pump, the diameter of the pump drive, the motor driving the pump and also how it is geared....all this may sound like a leech on any electrical system but wait for it......
 
"You cant get something for nothing"...:(...sniff sniff...I know how sad!
 
regards
 
 
Leon Ducrot
New Zealand
 
P.S and yes the diving here is fantastic in Northland, crayfish/lobster are plentiful all year round with waters between 12-23 degrees all year round, it is absolutely magic, we also have various Naval and Merchant Navy wrecks all within 1/2 hour drive from my house....fantastic fantastic fantastic...I highly recommend it to any psubber or diver!
 
 
----- Original Message -----
Sent: Thursday, September 07, 2006 5:43 PM
Subject: Re: [PSUBS-MAILIST] Sodium Polyacrylate

Welcome, Leon.  Understand the diving down there is superb.
 
Regarding your A/C unit.  What would be the current draw?  We're working with batteries here, and, next to bottled air, battery reserve is our nextest, worstest nightmare.
 
Rick Lucertini
Vancouver, Canada
----- Original Message -----
Sent: Wednesday, September 06, 2006 8:53 PM
Subject: Re: [PSUBS-MAILIST] Sodium Polyacrylate

Automotive air conditioning unit, belt driven and actuated by centrefugal clutch off dc motor? Why has this not been discussed.
 
Sorry for rudeness, my name is Leon and thought id share my thoughts, I am in New Zealand and have been in design of a 2 person ambient pressure dry sub for previous 12 months or so, am currently fulfilling contract in N.Z before headed to Perth Australia for summer followed by U.K Summer time.
 
I am currently teaching engineering apprentices at a tertiary institute and consider myself reasonably proficient in C.A.D systems and design concepts.  My photos should be up on site in next few days hopefully.
 
Well, no doubt we will be in contact sooner or later.
 
 
Leon Ducrot
New Zealand
----- Original Message -----
Sent: Thursday, September 07, 2006 1:08 PM
Subject: RE: [PSUBS-MAILIST] Sodium Polyacrylate

Unfortunately the coiling coil heat exchange dehumidifier doesn?t work in warm waters as you need a fair temperature differential to get effective condensation.  Again, keep it simple; the more mechanics you put into the sub, the more likely it isn?t going to work.  Also think about these motors in the high humidity atmosphere we are discussing?they will have a short life if they don?t arc & spark at the wrong time.  Two things submariners fear the most: fire and flooding.

 

Respectfully,

Jay K. Jeffries

Andros Island, Bahamas

 

Natura nihil fit in frustra
- Nature does nothing in vain

 

 

 


From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of George Slaterpryce
Sent: Wednesday, September 06, 2006 4:45 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Sodium Polyacrylate

 

Yeah, A brass plate fitted to the hull would work great... like a giant heat sink. Problem is the unit would have to be custom fit for each hull. Which might not be a huge issue now that I think about it. PSubbers are mostly all mechanicly inclined or know someone who is. I'm pretty sure they could figure out how to fit a heat sink to the hull.

 

It wouldn't be anything more complex than a snaking of brass/copper tubing over a copper plate that would have to be bolted and formed to the inner hull salt water would probably go best with this, should transfer heat a bit better.. plus not be as volatile as alchohol. Although alchohol would still be better from a pure efficiency viewpoint. Then again regular coolant would probably be more efficient... but that's not within the constraints I'm envisioning this.

 

George H. Slaterpryce III
www.captovis.com

----- Original Message -----

From: Paul Kreemer

Sent: Wednesday, September 06, 2006 4:33 PM

Subject: Re: [PSUBS-MAILIST] Sodium Polyacrylate

 

I wonder if you couldn't circulate seawater thru instead.  Or just a passive thermal connection to the pressure hull.  It'd be nice to take advantage of the dropping ambient water temperature, since it's what's causing much of the condensation.


Paul

On 9/6/06, George Slaterpryce <gslaterp@hotmail.com> wrote:

Addendum to this message.

 

Two considerations 1. If you fit the powder pack of sodium polyacrylate loose enough you won't have to use a high power induction fan (like the one used on an air conditioner) you could use a relatively low power consumption 12vdc motor based fan.

 

second, I don't know yet if alchohol is the best coolant of choice as it's flamable.

 

George H. Slaterpryce III
www.captovis.com

----- Original Message -----

Sent: Wednesday, September 06, 2006 3:23 PM

Subject: [PSUBS-MAILIST] Sodium Polyacrylate

 

Ok, I can't find a pre-fab Hummidity filter made with this stuff anywhere online... I know that they are made... but my google-fu is not strong on this search.

 

SO...

 

I thought about how you might make one.

 

First and foremost, used product will have to be switched out from time to time, so the main filter component will have to be easy to get to and switch out.

 

Second to promote condensation and from there condensation inside the filter unit itself it'll have to be slightly cooler than the enviroment outside the filter... Problem... small refrigiration units are expensive (energy use wise)

 

So, what I think one should do is to use a pipe with a fan on the intake side and a normal air filter on the outflow side. that inbetween the intake and outflow has a copper coil with a simple fountain (12vdc) pump that pushes rubbing alchohol through the pipe at speed. Probably accellerated via a kort like nozzle off the pump. It wouldn't cool well enough for a air conditioner, but it should promote a cool atmosphere inside the filter which would promote water to condense within the filter. In the center of the coil which is inside the pipe would be a tissue bag full of sodium polyacrylate. That once used can simply be pulled out and replaced.

 

I'm thinking of taking a break from BugEye II to prototype this. Anyone interesting in providing a testbed if I do?

 

 

George H. Slaterpryce III
www.captovis.com

 


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