Re: [PSUBS-MAILIST] Re:Stainless in aluminum

["Brian Cox" <ojaibees@ojai.net>]

The hull in question is only a soft ballast chamber and will not see any pressure.  I need the access ports in many places  (even on top )  because I have to plaster the inside of the chamber and the area is too small to crawl into.

Brian
----- Original Message ----- 
From: "Rick and Marcia" <empiricus@telus.net>
To: <personal_submersibles@psubs.org>
Sent: Sunday, August 29, 2004 11:34 PM
Subject: Re: [PSUBS-MAILIST] Re:Stainless in aluminum


> Regarding curing, what's the intended operating depth of your boat?  An 80%
> (or ~) cure may be sufficient.  Unless you've calculated stresses on every
> hull fitting the chances are pretty good you're over-building the hull
> anyhow.
> 
> Mind you, there is an argument to be had in that why build in an inherent
> fault to begin with . . .
> 
> It's a little like one of the original habitats: Through hulls were
> installed any old place including the ceiling.  Needless to say when a
> fitting started to let go it was over the heads of the occupants. After that
> the designers decided to follow the inverted cup model - all through
> fittings were located low.  The resulting "cup" gave less problems.
> 
> Rick
> 
> 
> ----- Original Message -----
> From: "Brian Cox" <ojaibees@ojai.net>
> To: <personal_submersibles@psubs.org>
> Sent: Sunday, August 29, 2004 7:48 PM
> Subject: Re: [PSUBS-MAILIST] Re:Stainless in aluminum
> 
> 
> > That is an option but I wouldn't feel confident in the integrity of the
> patch.  It's much better if the whole hull cures at the same time.
> >
> > Brian
> > ----- Original Message -----
> > From: <atozed@juno.com>
> > To: <personal_submersibles@psubs.org>
> > Sent: Sunday, August 29, 2004 7:11 PM
> > Subject: Re: [PSUBS-MAILIST] Re:Stainless in aluminum
> >
> >
> > > Not completely unrelated to subs, coming soon...is talk like a pirate
> > > day!  http://www.talklikeapirate.com/piratehome.html
> > >
> > > Brian-
> > > Why not plug them with cement? Your form will have rebar, wire, and
> mesh,
> > > right? Leave 6" gaps in the rebar where you'll want access. Cut away the
> > > mesh and remove it. Cut but leave the wire, bend in out of your way.
> > > Cement the inside, bend the wire back and cover with mesh. Cement over
> > > the access hole, you won't need it again will you?
> > > Even if you did, knocking the patch out with a hammer and redoing it
> > > might be easier than what you're thinking. BTW I'm not sure exactly what
> > > that is, so maybe this idea makes no sense.
> > >
> > > -Peter Korwin
> > >
> > >
> > > On Sun, 29 Aug 2004 17:16:03 -0700 "Brian Cox" <ojaibees@ojai.net>
> > > writes:
> > > > Thanks,  I'm going to need quite a number of aluminum access ports
> > > > which will be approximately 6" in diameter ( big enough to put your
> > > > arm in) going through my ferro-cement soft ballast chamber.  I've
> > > > decided to construct the thing in two pieces and then weld in back
> > > > together and then plaster the inside using arm hole access ports.
> > > > The holes  will be plugged with the aluminum fittings, once
> > > > everything has cured.
> > > >
> > > > Brian
> > >
> 
> 
> 
> 
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