Re: [PSUBS-MAILIST] concrete submarine

[diagroto@ibague.cetcol.net.co]

Hello Michael,
Would not use concrete as material for a wet sub.
Concrete works fine with wall thickness above 5cm (steel is protected-bringing 
concrete into form is easy) - i would do a nice wet sub (prone position 
floating) with acrylic and glass fiber materials. Or as a steel or alu cage 
with textile coating. (similar to airplanes)
No need for extra protection of steel in a good built concrete wall. Steel in 
concrete is by far better protected than steel in a steel hull where only 
protection against seawater is paint. Do paint over concrete is dobble save.

Greetings 
Wilfried

Mensaje citado por: Michael Edwards <me@sustainkauai.org>:

> Greetings Wilfried:
> 
> Thanks for the reply!
> 
> Yes, I understand the size/weight issues. A am exploring the idea of a
> pressurized,
> wet sub.
> The prone position is very uncomfortable, dry in gravity, but very
> doable floating.
> 
> I've spent thousand of hours underwater in this position. I don't need
> much over 2
> hours duration.
> My goal is to keep the trailer weight under 3 tons.
> 
> Any thoughts about using a high fly ash content to keep sea water out of
> the
> concrete,
> and using galvanized or stainless to deal with corrosion?
> 
> Best regards
> 
> Michael
> 
> 
> diagroto@ibague.cetcol.net.co wrote:
> 
> > Hello Michael,
> >
> > Yes, that is my approach too.
> > If you did a couple of tanks and test objects for pressure tests you
> will be
> > familiar enough with the material to make a sub that works.
> > My first was very small 2m long 70 cm diameter - 800kg - trailerabel
> (concrete)
> > BUT - you need a certain size to be comfortable enough inside to have
> a several
> > hours dive. As discussed by carsten it will be hard to combine
> trailerable
> > (small and light weight) with comfortable (certain space).
> > Subs are "heavy machines" by nature (below flotability) this means 1m
> cubic room
> > (very little to be comfortable)is 1 ton trailer weight (heavy for
> trailer).
> > So i ended up with a 9m 20ton sub comfortable inside, but far from
> trailerable.
> > If you need a real trailerable sub you might go for a wet sub only.
> >
> > see:
> > http://imulead.com/sub.html
> >
> > Greetings
> >
> > Wilfried
> >
> > Mensaje citado por: Michael Edwards <me@sustainkauai.org>:
> >
> > > Greeting Subers, and hello Wilfried:
> > >
> > > I am very interested in concrete submarine technologies.
> > >
> > > I retired from 30+ years commercial diving and running ships and
> now
> > > live in
> > > Hawaii.
> > > Bad for manufacturing but good diving ;-)
> > >
> > > I will be using concrete construction for a number of projects at
> our
> > > farm, water
> > > tanks,
> > > and buildings so why not build a sub?
> > >
> > > I am planning first to build a one-man micro sub. It needs to be
> > > trailerable.
> > > It would be nice to have something the tiger sharks here can't bite
> in
> > > half.
> > >
> > > Thanks for hosting this forum!
> > >
> > > Best regards
> > >
> > > Michael Edwards
> > >
> > >
>