U.S.S. Texas was in Portsmouth Naval Shipyard since September of 2020.

She just left heading for home base in Hawaii.

https://www.navytimes.com/news/your...naval-shipyard/

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Brings back memories! Thanks for the post.

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4 out of 3 people struggle with math.

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So I looked this boat up and saw they cowl the prop like a jet engine.
For more efficiency?

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If it flies, I can crash it!

Neither of my boats had the cowl so I don’t know for sure the purpose. My guess is for sound reduction of the screw when cruising at higher speeds—especially at deeper depths when the cavitation would be compressed.

__________________
Never trust an atom. They make up everything.

4 out of 3 people struggle with math.

Chemically, alcohol IS a solution.

NAR# 94042
SAM# 0078

It might also serve the same purpose as a ducted fan on a jet engine.

Assuming you're talking the USS Texas sub (and not the battleship of the same name - which still exists ) - yes it's to quell noise, as well as improve efficiency. Much of the noise from an aircraft propeller is from the trailing blade slicing into the tip vortex of the leading blade. Putting a cowling around that (such as on a turbofan jet engine) sharply reduces the tip vortex and reduces the resultant noise. That vortex also consumes energy and hence reduces efficiency - so going to a ducted prop (or fan) improves efficiency.
That being said, efficiency is not a big concern on a nuke sub - but noise is.