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Columbia Class attributes

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Rontini599 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rontini599 Quote  Post ReplyReply Direct Link To This Post Topic: Columbia Class attributes
    Posted: 30 May 2018 at 3:28pm
1. Electric Propulsion-no reduction gears-much quieter
2. X shape stern control surfaces with stern planes inside the housing of the propulsor (water jet) drive system. (No prop)
3. Maneuvering Room area is 3 levels.  Top level is Advanced Seal Delivery System.
4. Retractable bow (sail planes)
5. 6 mast sail vs Ohio's 10.
6. Bow Dome is composite material to better pass signals through
7. Same length as Ohio but 1 foot wider
8. HY100 Stainless hull coated with rubber material
9. New reactor control rod surfaces for better reactor control.
10. 42 year life
11. 2027 should see the first one in the water.  12 to replace current 16 Ohios.  Because of increased reactor core life, less overhauls, thus balancing out the 12/16 ratio. 
12. D-5 Trident II missiles
13. First cost is $6.2 billion then down to $4.2 billion
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SaltiDawg Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2018 at 6:49pm
Ron,

The Columbia Class will have a ducted propulsor (Prop.).

We examined moving the aft control surfaces inboard  on ducted  propulsors years ago.


Edited by SaltiDawg - 09 Jun 2018 at 7:34pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sewer Pipe Snipe Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2018 at 8:37am
Sounds like Red October!
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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)?
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rontini599 Quote  Post ReplyReply Direct Link To This Post 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


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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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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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Flapper Quote  Post ReplyReply Direct Link To This Post 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.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Flapper Quote  Post ReplyReply Direct Link To This Post 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
ET1ss Nuke; 1962 - 1973. SSN-588, CVA-63, SSBN-629 BLUE, SSN-669 PLANKOWNER, FICPAC
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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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