Re: [PSUBS-MAILIST] Moveable Propeller & Kort Nozzle

[vbra676539@aol.com]

No misunderstandings here, especially after seeing the drawing. If the application suits your design, then hey, why not? The only real issue is weight and complexity and in my experience, simple is more serviceable in the long run. Navy boys from any country have more resources, more personnel and more money. It would be interesting to talk to them directly about the vectored Kort design and try to get a feel for whether it is a serviceable alternative to fixed units at our (psubs) level.

Thanks for the drawing. It is definitely food for thought.

Vance

-----Original Message-----
From: Jens Laland <laland@artematrix.org>
To: personal_submersibles@psubs.org
Sent: Sat, Mar 27, 2010 11:22 am
Subject: [PSUBS-MAILIST] Moveable Propeller & Kort Nozzle

Vance

Thank you very much for the educational part on the live rudder issue.
This is obviously something I need to consider in my own design (as
explained below).

** I believe the nozzles turned around the prop, deflecting thrust.

Maybe there is a misunderstanding somewhere in the midst of all this. My
particular idea is a based on a design used by the Swedish Navy on the
midget submarine "Spiggen II" (that replaced the former X-craft
"Stickleback" they purchased from the Royal Navy in 1957).

The Swedish Navy designed this submarine themselves, and of particular
interest to me was the subs propulsion system, which had the outer shaft
section furnished with a constant-velocity joint, and this steerable
(rotating) link was used to maneuver the craft in all directions (up/down
and sideways). The Kort nozzle and its large propeller remained in a fixed
position in relation to each other at all times.

http://traktoria.org/PROPULSION/spiggen2_propeller-detail.jpg

So I guess we could say that this assembly did not deflect thrust, but
rather applied it in the direction needed (using the horizontal and the
vertical axis at the same time). This actually gave the 11.9 m long
submarine a remarkable steering control, even at very low speed.

Best regards,
Jens Laland




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