Rontini Submarine BBS : Columbia Class attributes http://RontiniSubmarineBBS.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sun, 03 May 2026 22:07:26 +0000 Tue, 05 Jun 2018 20:40:01 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.04 360 RontiniSubmarineBBS.com/RSS_post_feed.asp?TID=4614 <![CDATA[Rontini Submarine BBS]]> http://RontiniSubmarineBBS.com/forum_images/Rontini_2021_5.gif http://RontiniSubmarineBBS.com/ <![CDATA[Columbia Class attributes : Now, I know very little about...]]> http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12459&title=columbia-class-attributes#12459 Author: Dr. Stan
Subject: 4614
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?

]]> Tue, 05 Jun 2018 20:40:01 +0000 http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12459&title=columbia-class-attributes#12459 <![CDATA[Columbia Class attributes : Precisely. Note the control surfaces...]]> http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12456&title=columbia-class-attributes#12456 Author: SaltiDawg
Subject: 4614
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]]> Tue, 05 Jun 2018 15:20:02 +0000 http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12456&title=columbia-class-attributes#12456 <![CDATA[Columbia Class attributes : Is the ducted propulsor you refer...]]> http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12454&title=columbia-class-attributes#12454 Author: Dr. Stan
Subject: 4614
Posted: 05 Jun 2018 at 11:04am

Is the ducted propulsor you refer to similar to the ones in the below graphics?






]]> Tue, 05 Jun 2018 11:04:28 +0000 http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12454&title=columbia-class-attributes#12454 <![CDATA[Columbia Class attributes : No disrespect, but that Google...]]> http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12451&title=columbia-class-attributes#12451 Author: SaltiDawg
Subject: 4614
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]]> Mon, 04 Jun 2018 19:56:40 +0000 http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12451&title=columbia-class-attributes#12451 <![CDATA[Columbia Class attributes : From the patent link Ron provided:Each...]]> http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12441&title=columbia-class-attributes#12441 Author: Flapper
Subject: 4614
Posted: 03 Jun 2018 at 5:15pm

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]]> Sun, 03 Jun 2018 17:15:05 +0000 http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12441&title=columbia-class-attributes#12441 <![CDATA[Columbia Class attributes : Bow planes are retractable to...]]> http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12440&title=columbia-class-attributes#12440 Author: Flapper
Subject: 4614
Posted: 03 Jun 2018 at 2:08pm

Bow planes are retractable to avoid damage while berthed and during close quarters surfaced maneuvering, and for blue-nose ops when surfacing through ice.

]]> Sun, 03 Jun 2018 14:08:41 +0000 http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12440&title=columbia-class-attributes#12440 <![CDATA[Columbia Class attributes : I&#039;m guessing whoever wrote...]]> http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12439&title=columbia-class-attributes#12439 Author: gerry
Subject: 4614
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?
]]> Sun, 03 Jun 2018 00:48:25 +0000 http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12439&title=columbia-class-attributes#12439 <![CDATA[Columbia Class attributes : Respectfully, my post above stands,...]]> http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12438&title=columbia-class-attributes#12438 Author: SaltiDawg
Subject: 4614
Posted: 02 Jun 2018 at 9:11pm

Respectfully, my post above stands, does it not?
]]> Sat, 02 Jun 2018 21:11:01 +0000 http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12438&title=columbia-class-attributes#12438 <![CDATA[Columbia Class attributes : Just reported what I read. I don&#039;t...]]> http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12436&title=columbia-class-attributes#12436 Author: Rontini599
Subject: 4614
Posted: 01 Jun 2018 at 10:38pm

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


]]> Fri, 01 Jun 2018 22:38:59 +0000 http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12436&title=columbia-class-attributes#12436 <![CDATA[Columbia Class attributes : Are you sure about: 1 Maneuvering...]]> http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12429&title=columbia-class-attributes#12429 Author: Curt
Subject: 4614
Posted: 31 May 2018 at 9:44am

Are you sure about:

 1 Maneuvering Room area is 3 levels?
 
2 Retractable bow (sail planes)? 
 
]]> Thu, 31 May 2018 09:44:04 +0000 http://RontiniSubmarineBBS.com/forum_posts.asp?TID=4614&PID=12429&title=columbia-class-attributes#12429