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Re: [PSUBS-MAILIST] Ambient breathing air system

Hi Dan,
Bleeding is a not very effective way to remove CO2 buildup. What I mean by not very effective is let's say you have a glass full of grape juice (grape juice being CO2) and you want to replace the grape juice by clear water. You start to slowly pour into the glass water. The water blend in with the juice and the color of the juice begin to move from dark purple to a lighter shade of purple. The glass quickly overfill and some of the juice/water mixture spill over the glass. Can you imagine the amount of water it will take to have your glass water clear! And let's imagine that at the same time you start to pour in a smaller amount of grape juice into the glass...
So to answer your question: It is very hard to say. You would have to know how much liter of CO2 you expire per minutes and bleed in something like 2 or 3 times that and you would still have a CO2 buildup.
What I recommend is you make some surface tests. Have a flowmeter installed into your bleed system and time how long you can stay inside the sub at a given flow. Also determine the dive time you want.
There is no ideal answer to the problem. I have the same trouble as you. In my sub, with-out a bleed I can stay 30-35 minutes. And with fresh air inside the sub I can stay like 40-45 minutes before the air became stall.
As for the system, no you don't need to warm the air. And your pressure system should take care of the pressure build-up made by the bleeding system. 

I hope it help... :)

Pierre Poulin
----- Original Message ----- From: "Daniel Edwards" <dan_f_edwards@hotmail.com> 
To: <personal_submersibles@psubs.org>
Sent: Sunday, November 20, 2005 7:06 AM
Subject: [PSUBS-MAILIST] Ambient breathing air system
Does anyone have info on the amount/rate of compressed air per person which should be bled into ambient dry designs and also should there be a seperate pressure equalization system aswell as continous bleeding of compressed air into the cabin. does the continous bleed also have to be at ambient temperature. 

Cheers for any advice in advance.

Dan Edwards.



From: "Rick and Marcia" <empiricus@telus.net>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] Re: Freya
Date: Sat, 19 Nov 2005 02:46:14 -0800

Airplanes . . . talk to me.  What's your interest (offlist!!!)

Rick
  ----- Original Message -----
  From: Joseph Perkel
  To: personal_submersibles@psubs.org
  Sent: Thursday, November 17, 2005 5:29 PM
  Subject: [PSUBS-MAILIST] Re: Freya



  Bill, Carsten
As Al pointed out, she wont fit in the UPS overnight express envelope. I was aware of Freya being for sale before I joined the group. She's a fine boat, a testament to her builders passion and skill but, she will never really be any one else's boat now will she? (Rhetorical question)
I could build an airplane, that is a certainty as I have expertise in that field...but nothing "speaks" to her owner quite like a seagoing vessel and submarines are... well special. To actually design and build a functional one is a rare individual lifetime achievement. A lot of people can climb Everest, just pay your money and go fall off, but this...is really special. 

  Eventually, I will learn this business and get down to making a memory.

  Joe






----------------------------------------------------------------------------

    From:  Carsten Standfuss <Merlinsub@t-online.de>
    Reply-To:  personal_submersibles@psubs.org
    To:  personal_submersibles@psubs.org
    Subject:  Re: [PSUBS-MAILIST] Free Flooding Spaces
    Date:  Thu, 17 Nov 2005 22:41:34 +0100
    >Ask him directly..
    >
    >http://www.submarines.dk/
    >
    >regards Carsten
    >
    > > Akins schrieb:
    > >
    > > Hi Joe.
    > >
    > > I know you wanted a WW2 somewhat looking sub design. I heard that
    > > Freya was for sale at one time by Peter Madsen.
    > >
> > Have you checked out Freya yet Joe? She has that WW2 look about her. 
    > > She was originally diesel/electric but I heard
    > >
> > Peter removed the diesel to make it less cramped and now Freya is only 
    > > electric. I wonder if she is still for sale and if she
    > >
> > is, for how much? The advantages would be she is already built and 
    > > working with view ports and all, the disadvantages
    > >
> > would be the cost and she is only set up with electric motors right 
    > > now so her range is more limited. But she had a diesel
    > >
> > in her before, perhaps you could replace it again and have both diesel 
    > > and electric.
    > >
> > Does anyone know if Peter still wants to sell Freya and for how much? 
    > >
    > > Bill.
    > >
    > >
    >
    >
    >
    >

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