Quote:
Originally Posted by freebeard
'[C]renelated' works for me. I'd bet that even if there wasn't a measurable difference in drag, you'd notice it acoustically.
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Absolutely!
Especially regarding hunter/killer subs and torpedoes.The designers appear to take great care with all trailing surfaces to avoid eddies and turbulence and their attendant 'noise.'
And I believe that the submarine propulsor technologies are state secrets,on account of their 'stealth' advantages.
Really 'clean' hydrodynamics!
PS It would be interesting to compare the boat tail's boundary layer toroid thickness compared to the propulsor geometry and dimensions.
Here's a link to a submarine's noise-reducing 'lampshade.'
Sorry,wouldn't allow it
https://www.google.com/search?q=curt...ml%3B647%3B276
http://www.mycity-military.com/thumb...8521_image.jpg