Re: Ferro cement was Hull Material ??

["Dan J. Rice" <dan.j.rice@sherwin.com>]

Thanks to all who answered.

For an unmanned, small autonomous or R/C sub what are the certification issues?
Maybe this would be a better place to try a ferro hull.

Dan




MerlinSub@t-online.de (Carsten Standfu_) on 10/23/99 02:20:56 PM

Please respond to personal_submersibles@psubs.org

To:   personal_submersibles@psubs.org
cc:    (bcc: Dan J. Rice/EST/Sherwin-Williams)

Subject:  Ferro cement was Hull Material ??



Carsten - from Germany

A man in Austria has built a submarine in ferro cement.

Its 9 m (29,5 feet)  long and the thickness of the hull
is 0,08 of the diameter - hull is like the minesweeper hulls -
very streamlined.
Beam is 2,4 m (8 feet) and weight of the hull is 15 t.
Displacement was given with about 20 t.
The price for one hull new without anything is 43.000 DM ( 23.200
Dollar). Dive deep was given with 50m (160 feet).
He offered this kind of hulls also for semi-submersibles, UW-Bar,
UW-Station, Snorkelboat only.

Seems that he has a good experience with ferro cement but is not so
expirence  with submarine technology. (The given poor informations
about engines, battery and technology indicates that.)

His Adress:
Ellmer Wilfried
Hauotstr.17c
A 2344 Ma.Enzersdorf
Tel.02236 49952
Austria

Freezing will be a problem, and I have only a bad fotocopy of a picture
shows the hull half out of the water (without ballast).
Maybe he finished his sub maybe not (was 1994).
He reports in 1994 that his sub was 2 years in the water without
any docking.

regards Carsten - and it will never be certified..

Karl Fuller schrieb:
>
> Hi Dan,
> I agree, ferro must be a possibility  and it should work in theory but it
> could be hard to get certified. I guess that like in yacht hulls it has a
> poor reputation and for a sub hull you can't afford to experiment. Certainly
> it has merits in the way of cost and hull forms that could be made.
>
> Good luck,
> Karl
>
> ----- Original Message -----
> From: Dan J. Rice <dan.j.rice@sherwin.com>
> To: <personal_submersibles@psubs.org>
> Sent: 21 October 1999 19:54
> Subject: Hull Material ??
>
> >
> >
> > Is Ferro Cement a possibility? What reinforcement? What sealants?
> > I know it has been used for power boat hulls. The weight would seem to be
> a plus
> > for subs, as well as ease of construction and cheaper price.
> > Design would be more flexible than steel, and it would seem to be a good
> choice
> > for compression strength.
> > Anyone tried it?
> >
> > Dan
> >
> >
> >