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Joined: Feb 2010
Posts: 15,651
Campfire Ranger
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Campfire Ranger
Joined: Feb 2010
Posts: 15,651 |
It sounds like a method of boundary layer control used on aircraft. Some airplanes will have small pores in the skin in certain areas where small amounts of bleed air from the engines are pumped through to break up the boundary layer, thus reducing drag. The boundary layer on an aircraft (or sub/ship hull) is the area right next the skin where at a microscopic level the air or water kind of "sticks" to the skin. If you can break up that "stickiness" then you can cut down on a lot of the drag so you can go faster with less power. https://en.wikipedia.org/wiki/Boundary_layer The F-4 N's and J's had both leading edge and trailing edge BLC on the leading edge slats and the flaps to energize the boundary layer to move it faster. It allowed us to fly slower w/o stalling. It also created the distinctive howling noise you'd hear from a jet in the landing pattern.
NRA Life,Endowment,Patron or Benefactor since '72.
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Joined: Jan 2001
Posts: 59,140
Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2001
Posts: 59,140 |
Hard to believe they would be stupid enough to try it. Bubbles are real bad if you are trying to be quiet. Um, no.. Even the Razorback had the (at the time, new) prairie masker system Had no idea Prairie Masker was that old. Still in use today on the DDG's and CG's. They are also blowing bubbles out of another underwater part. ETA: Since you can find it on the net, they also blow bleed air out of the screws too. Nothing to do with speed, it masks acoustic signature. Correct - I failed to mention that little item.. Good catch.. 
Ex- USN (SS) '66-'69
Pro-Constitution.
LET'S GO BRANDON!!!
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Joined: Feb 2005
Posts: 3,241
Campfire Tracker
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Campfire Tracker
Joined: Feb 2005
Posts: 3,241 |
I spent 24 years in the Navy and never had anything to do with anything other than carriers and big deck gators. When I retired I took a job working on DDG's and I will never forget the first time I went into the MMR. I looked around for about 5 minutes and said "who is the silly bastard that decided to put jet engines on a boat? If we light the afterburners can this sumbitch pop a wheelie?" Never had a clue what ran those tin cans in the entire 24 years.
-Piss into the wind.
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Joined: Nov 2005
Posts: 7,467
Campfire Tracker
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Campfire Tracker
Joined: Nov 2005
Posts: 7,467 |
I spent 24 years in the Navy and never had anything to do with anything other than carriers and big deck gators. When I retired I took a job working on DDG's and I will never forget the first time I went into the MMR. I looked around for about 5 minutes and said "who is the silly bastard that decided to put jet engines on a boat? If we light the afterburners can this sumbitch pop a wheelie?" Never had a clue what ran those tin cans in the entire 24 years. And yet another example of your meeting my expectations of your intelligence: not much.
I have come here to chew bubblegum and kick ass. And I'm all out of bubblegum. I do tend to fit in well wherever I go in person. The campfire is the most outside exposure I get. No TV, no newspaper.
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Joined: Dec 2000
Posts: 39,301
Campfire 'Bwana
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Campfire 'Bwana
Joined: Dec 2000
Posts: 39,301 |
Hard to believe they would be stupid enough to try it. Bubbles are real bad if you are trying to be quiet. Pretty much the opposite, bleed air from the turbines make the bubble layer to mask acoustics signature. Apparently works pretty well as they put a lot of money into them to ensure they work. [/quote] Tridents work a little different and a LOT quieter.
The first time I shot myself in the head...
Meniere's Sucks Big Time!!!
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Joined: Nov 2008
Posts: 22,131
Campfire Ranger
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Campfire Ranger
Joined: Nov 2008
Posts: 22,131 |
35 plus when I was on temporary duty on the JFK. It was the only Nimitz class that wasn't a nuke(thank you Jimma Carter). Uh, the JFK was commissioned in 1968. Jimmy Carter wasn't in office until 1977. You are right about that... I know it was supposed to be a nuke but politics got in the way of the propulsion.I've been on a few carriers and don't remember that there was much difference than the Nimitz class ships.
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I'm a big fan of the courtesy flush.
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