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



I believe the Schilling Ring Thruster would qualify as a truly shaftless propulsion system. It's an all electric system without any need to convert shaft power whether from a electric motor or a engine to hydraulic power used to turn a prop shaft.

http://www.youtube.com/watch?v=No0pzwOLabk

Brent

----- Original Message ----- From: "SHinzey" <ghambit7@gmail.com>
To: <personal_submersibles@psubs.org>
Sent: Saturday, March 24, 2007 10:23 PM
Subject: Re: [PSUBS-MAILIST] Jane article on current submarine development.


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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