Re: [PSUBS-MAILIST] ALUMINUM BALLAST

["bruno masse" <rodin4@videotron.ca>]

i,m looking for a solution for reduce the pound on the sub!
i am on the design and i want to figure!thanks
----- Original Message ----- 
From: "Ian Roxborough" <irox@ix.netcom.com>
To: <personal_submersibles@psubs.org>
Sent: Saturday, May 18, 2002 1:14 AM
Subject: Re: [PSUBS-MAILIST] ALUMINUM BALLAST


> 
> Hi,
> 
> I'm not sure it really matters water the ballast
> tanks are made of, however, there are a couple
> of things to take in to consideration if you are
> considering using aluminum.
> 
> Is you ballast tank hard or soft?
> 
> If it is a soft ballast tank then the strength
> doesn't matter "too much" (it's got to be able to
> stand the force of air pushing whater out of),
> because the air inside the tank should be at
> ambient pressure like the human occupied space
> in a dry ambient sub.  Normally the Main Ballast
> Tanks (MBT) are soft tanks.
> 
> If it is a hard ballast tank, then it must be
> must be able to with stand the pressure difference
> of inside your submarine and the out side water
> pressure.  This will require a lot more engineering
> than the a soft tank, but aluminum is strong than
> steel.
> 
> The other consideration I can remember is "what
> other metals are you using?".  You don't want
> important parts of your submarine to form battry
> and dissolve or corrode away (if I remember correctly,
> Al will make Fe dissolve to protect it).
> 
> Ian.
> 
> On Fri, 17 May 2002 20:19:31 -0300
> "bruno masse" <rodin4@videotron.ca> wrote:
> 
> > IS IT A GOOD IDEA TO BUILD BALLAST TANK
> > WITH ALUMINUM? IF YES IS IT GOOD FOR DEEP SUB
> > ABOUT 1000 FEETS?
> > 
> > TANKS
> > 
> > BRUNO
> > 
> 
> 
> --