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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