The SteelNavy.Com Message Board: I like the giant sombrero!

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I like the giant sombrero!

Posted by Mark Leonard on February 8, 2025, 7:20:30, in reply to "Re: A question for the USN SSBN folks-"

Thanks, Ted! I was actually considering modeling the Vallejo, as I live about half an hour away from Mare Island and have often had a look at her sail.

Previous Message

I believe that the vertical end plates on the stern planes were on the last twelve iterations of the Polaris/Poseidon submarines, beginning with the Ben Franklin (SCB-216 design). The prior class was the SCB-180 design.

Here is a photo of the Mariano Vallejo submarine launch where you can see the end plates.
Vallejo launch

I believe these were for added stability of the submarine. Later Polaris boats had BQR-7 linear bow arrays and BQS-4 active/passive system, also in the bow. No mention of a passive PUFFS-like array system.

The picture I have of the SSN Barb with a sonar system on the stern planes shows a much smaller vertical “fin”. I would hazard a guess that since there is a fair degree of noise (plane movements, screw noise) toward the stern, that makes a passive array at the stern plane less useful.

Previous Message

Just for fun, I'm doing the DML 1/700 Lafayette class submarine (all 16 pieces of it, including the stand!) and started wondering about the stern planes on the early boomers. You occasionally see the vertical appendages on the outer ends of the horizontal stern planes. I know they're not rudders, and I understand they might be a quieting measure. Was there a rule about which classes got them?

Thanks

Re: I like the giant sombrero! - T. Dougherty February 8, 2025, 20:13:51
- Apologies! - Mark Leonard February 9, 2025, 9:40:23
  - Re: Apologies! - TOM D. February 10, 2025, 5:23:33
    - Re: Apologies! - TOM D February 10, 2025, 5:35:46
      - It’s all that cough syrup n/t - Mark Leonard February 10, 2025, 8:49:39

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[quote]
Thanks, Ted! I was actually considering modeling the Vallejo, as I live about half an hour away from Mare Island and have often had a look at her sail.
[quote]
I believe that the vertical end plates on the stern planes were on the last twelve iterations of the Polaris/Poseidon submarines, beginning with the Ben Franklin (SCB-216 design).  The prior class was the SCB-180 design.

Here is a photo of the Mariano Vallejo submarine launch where you can see the end plates.
 Vallejo launch

I believe these were for added stability of the submarine.  Later Polaris boats had BQR-7 linear bow arrays and BQS-4 active/passive system, also in the bow.   No mention of a passive PUFFS-like array system.

The picture I have of the SSN Barb with a sonar system on the stern planes shows a much smaller vertical “fin”.  I would hazard a guess that since there is a fair degree of noise (plane movements, screw noise) toward the stern, that makes a passive array at the stern plane less useful.
[quote]
Just for fun, I'm doing the DML 1/700 Lafayette class submarine (all 16 pieces of it,  including the stand!) and started wondering about the stern planes  on the early boomers. You occasionally see the vertical  appendages on the outer ends of the horizontal stern planes. I know they're not rudders, and I understand they might be a quieting measure. Was there a rule about which classes got them?

Thanks
[/quote]
[/quote]
[/quote]

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