Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-14-2022, 05:13 PM   #1 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 14,540
Thanks: 22,567
Thanked 6,717 Times in 4,256 Posts
Soviet Akula- Class nuclear submarine

Rather than submerged in an ocean of air, like our cars, the Akula-Class, fastest for it's reactor type, is a study in hydrodynamic efficiency, submerged in something more than 800-times more dense than what our cars 'swim' through.

__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-14-2022, 05:48 PM   #2 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 14,540
Thanks: 22,567
Thanked 6,717 Times in 4,256 Posts
Akula 'sail / conning tower'

Some of you may notice that the sail 'on top of' the Akula sub has a striking resemblance to some control cars 'underneath' the great airships of the 20th-Century.
And it's no fluke, just good design.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 02-14-2022, 06:05 PM   #3 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 23,404
Thanks: 6,603
Thanked 7,467 Times in 6,088 Posts
They don't show the propeller except that model at 4:11. Possibly the skewback screw?

__________________
.
.

Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
____________________

Not responsible for spelling until vBulletin's British-spelling leaning spell checker is fixed.
____________________
  Reply With Quote
Old 02-16-2022, 11:05 AM   #4 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 14,540
Thanks: 22,567
Thanked 6,717 Times in 4,256 Posts
propellers / propulsors

Quote:
Originally Posted by freebeard View Post
They don't show the propeller except that model at 4:11. Possibly the skewback screw?

These are state secrets. They're kept under wraps during manufacture and launch.
Other than those on the authorized access list, only NAVY SEALs and SOVIET 'SEALS' have ever seen them. And what they've seen must be taken to the grave.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 02-16-2022, 12:07 PM   #5 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 23,404
Thanks: 6,603
Thanked 7,467 Times in 6,088 Posts
Quote:
These are state secrets.
So, don't look?

I thought you might be interested in the four-fin vortex generator on the seven-blade prop. It's right in the thumbnail.
__________________
.
.

Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
____________________

Not responsible for spelling until vBulletin's British-spelling leaning spell checker is fixed.
____________________
  Reply With Quote
The Following User Says Thank You to freebeard For This Useful Post:
aerohead (06-13-2022)
Old 02-16-2022, 12:16 PM   #6 (permalink)
Somewhat crazed
 
Piotrsko's Avatar
 
Join Date: Sep 2013
Location: 1826 miles WSW of Normal
Posts: 3,040
Thanks: 338
Thanked 876 Times in 766 Posts
Vortices make sonar reflections. Bad juju in sub warfare. I suspect they are anti vortex.
__________________
casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
  Reply With Quote
The Following 2 Users Say Thank You to Piotrsko For This Useful Post:
aerohead (02-16-2022), freebeard (02-16-2022)
Old 02-16-2022, 12:19 PM   #7 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 14,540
Thanks: 22,567
Thanked 6,717 Times in 4,256 Posts
look

Quote:
Originally Posted by freebeard View Post
So, don't look?

I thought you might be interested in the four-fin vortex generator on the seven-blade prop. It's right in the thumbnail.
I'm kinda busy saving the world.
Hydo-accoustics doesn't play into that, best I can tell.
Although, my freedom to ponder saving the world comes at the expense of eyes-only military secrets and all-volunteer military service.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 02-16-2022, 12:28 PM   #8 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 14,540
Thanks: 22,567
Thanked 6,717 Times in 4,256 Posts
Bad juju

Quote:
Originally Posted by Piotrsko View Post
Vortices make sonar reflections. Bad juju in sub warfare. I suspect they are anti vortex.
Anti-cavitation as well. Collapsing water vapor bubbles shed from a propulsor would have a horrific acoustic signature.
It escalated the Vietnam War, when the electronics officer aboard the U.S.S. Vincennes detected the sound of his own screws, and it was reported to Washington D.C. as a hostile torpedo attack from N. Vietnam.
All Lyndon Johnson needed.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 02-16-2022, 02:09 PM   #9 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 23,404
Thanks: 6,603
Thanked 7,467 Times in 6,088 Posts
Quote:
I suspect they are anti vortex
Well, I'm certainly not going to watch the video again to find out, now that I know Youtube is disseminating Russian State secrets.
__________________
.
.

Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
____________________

Not responsible for spelling until vBulletin's British-spelling leaning spell checker is fixed.
____________________
  Reply With Quote
The Following User Says Thank You to freebeard For This Useful Post:
aerohead (06-13-2022)
Old 06-13-2022, 01:29 AM   #10 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 23,404
Thanks: 6,603
Thanked 7,467 Times in 6,088 Posts

Quote:
PBCF has been on the market since 1987.... To date, over 3,300 vessels have installed the device, which offers fuel savings (of 3-5%) by eliminating the hub vortex generated behind the rotating propeller and improving propeller efficiency.

__________________
.
.

Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
____________________

Not responsible for spelling until vBulletin's British-spelling leaning spell checker is fixed.
____________________
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com