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Columbia Class attributes
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Dr. Stan View Drop Down
Rickover
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    Posted: 05 Jun 2018 at 8:40pm
Now, I know very little about this as it very far outside my area of expertise, but I did study fluid flow in nuke school 56 years ago from which I remember 2 things:  laminar flow and turbulent flow.  At any rate, it seems to me that what you are saying is that having control surfaces forward of the duct or shroud which could distort the inflow causing it to affect the control surface action is not a good thing because it could increase noise and reduce efficiency.  And that having the control surfaces aft and outside the flow stream is better since it would not do that.  So, Dr. Jerry, am I misinterpreting this?
It has been my experience that folks who have no vices have very few virtues.~Abe Lincoln
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Points: 2865 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SaltiDawg Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jun 2018 at 3:20pm
Precisely.  Note the control surfaces are forward of the duct or shroud...

The UK has worked closely with the US for over forty years in the area of Submarine Propulsors and they have sent many variants to sea.

Dr. Jerry


Edited by SaltiDawg - 09 Jun 2018 at 7:37pm
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Points: 7455 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dr. Stan Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jun 2018 at 11:04am
Is the ducted propulsor you refer to similar to the ones in the below graphics?
It has been my experience that folks who have no vices have very few virtues.~Abe Lincoln
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Points: 2865 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SaltiDawg Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2018 at 7:56pm
No disrespect, but that Google Pattern has nothing to do with the SSBN(X).

it is for a motorized propulsor in size  up to 24Kw.




Edited by SaltiDawg - 09 Jun 2018 at 7:35pm
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From the patent link Ron provided: 
Each blade is attached to the inside of an annular ring, tips in toward common axis of rotation. Permanent magnets are mounted on outer rim of ring. 

That 'shaftless' design improves flow efficiency a lot, and it reduces cavitation significantly. The unit is 'spun up by big electromagnet coils contained in the outer housing of the propulsor assembly.

The shaftless direct electric drive allows elimination of the noisy reduction gears in current use.



Edited by Flapper - 03 Jun 2018 at 5:22pm
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Bow planes are retractable to avoid damage while berthed and during close quarters surfaced maneuvering, and for blue-nose ops when surfacing through ice.
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Points: 634 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gerry Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2018 at 12:48am
I'm guessing whoever wrote the article that Ron read confused "Maneuvering" with "Engine Room". Info I have seen on Colombia class had a large 3 level engine room, and there is indeed a SEAL staging/lockout facility in ERUL.

re: Bow planes vs sail planes - again, probably a non-submariner writing the article. Retractable... I can see foldable like the old fleet boats. Retractable though... seems like it would waste a lot of space and be a potential maintenance problem. *shrug*

Shaftless propeller (again, terminology... wouldnt we call it a screw?) - now that's voodoo. I mean, if you're turning a screw there has to be SOME sort of a shaft from the motor producing the motive force to the screw. Isnt a "propulsor" a different thing than a "propeller"? Aren't "propulsors" similar to a jet pump?
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Points: 2865 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SaltiDawg Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2018 at 9:11pm
Respectfully, my post above stands, does it not?
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Just reported what I read.  I don't make this stuff up.  Above Maneuvering was the Advanced Seal Delivery sytem and below is what looked like a pump room. 

US20070126297A1 - Shaftless propeller - Google Patents

patents.google.com/patent/US20070126297

A shaftless propeller may be made to ... A shaftless electrically driven propulsion propeller for use in an ... Ship pod-mounted hydrojet unit .

..

Shaftless Propulsion Technology for Next-Generation Nuclear ...
www.defencetalk.com/shaftless-propulsion...
DRS Technologies, Inc, PARSIPPANY: DRS Technologies, Inc. announced today that it was awarded a new $30 million contract, including options, to develop advanced shaftless propulsion technology for a next-generation U.S. Navy nuclear-powered submarine design study under the Tango Bravo program. Tango


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Points: 575 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Curt Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2018 at 9:44am
Are you sure about:

 1 Maneuvering Room area is 3 levels?
 
2 Retractable bow (sail planes)? 
 
Thanks,
Curt
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