Re: [PSUBS-MAILIST] Jane article on current submarine development.

[Ian Roxborough <irox@ix.netcom.com>]

Yeah.  I think they are talking about getting eliminating the main
drive shaft thru hull, by replacing it with an electric motor in
a pod, rather than removing the whole concept of the propeller shafts.

The external pods would still have propeller shafts.

I think they are heading in the right direction (although I might
be bias, given the evolution of K350 designs I've played with). ;)

I would like to hear more about them eliminating the hydraullic
systems.

Cheers,
  Ian.

On Sun, 25 Mar 2007 01:23:53 -0400
"SHinzey" <ghambit7@gmail.com> wrote:

>      Interesting read, but I tend to raise an eyebrow when anyone says 
> "shaftless propulsion."  In truth (as far as I know), it doesnt exist except 
> in a hypothetical "pulsejet" type water jet and in systems that mimic nature 
> (like the "shark-tail" drive) utilizing some kind of artificial muscle. 
> I've seen vids. of the shark-tail work in a wave tank; extremely interesting 
> (runs by electrically stimulated artificial muscle fibre).  And the water 
> jet exists also in a PWC scale I believe, but only as a power boost to the 
> main drive.
>      Anyways, "mermaid drives" (which is what this article is referring too) 
> have been around for many years.  Many modern ships use them actually and 
> even some old ones have some form of it.  It's nothing even remotely cutting 
> edge, but it's nice to see them try to adopt it on subs.  Even if they were 
> to implement a type of "outrunner" system where the motor itself serves as 
> the shaft, it's still a shaft though... u cant have an electromagnetic motor 
> w/o one.
> ----- Original Message ----- 
> From: "Ian Roxborough" <irox@ix.netcom.com>
> To: <personal_submersibles@psubs.org>
> Sent: Sunday, March 25, 2007 12:51 AM
> Subject: [PSUBS-MAILIST] Jane article on current submarine development.
> 
> 
> >
> > Geared towards military subs, but I think it's relavent for
> > home builders as well:
> >  http://www.janes.com/defence/naval_forces/news/jni/jni070323_1_n.shtml
> >
> > - Elimate direct drive.
> >   + no prop shaft.
> >   + no dedicated engines for propulsion.
> >   + cleaner exterior and interior.
> >
> > - Elimate hydraulics (internal and external).
> >   +  I'm guessing the a noise and maintenance advantage.
> >
> >
> >
> >
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