Harmony of the Seas claim

Sounds like a winner, especially for a fairly fast ship like a cruise ship.

Only issue I see is that its doing something new and weird on a CRUISE SHIP with a whole set of other issues.

Gonna be a real FUBAR if they had to rework the bottom of a giant cruise ship VS a bulk freighter.

I'm still smelling this whole thing is a mis-write by a dumb reporter who don't know what he is saying and its a normal hull on this ship.

 

Article on air pollution from cruise ships:

http://www.theguardian.com/environm...ise-ship-and-its-supersized-pollution-problem

 

I guess the massive diesels can run on heavy high sulfur oil, legally.

Maybe they just need to install something like 'scrubbers' on coal fired generators.

Still seems like high sulfur fuel should be saved for Shanghai to SF runs of freighters, not cruise ships hopping around the Med.

I guess they've totally solved any blow back on passengers? Seems kind of impossible given the way wind always blows camp fire smoke at me no matter where I sit. OK, that is partly because smoke will tend to follow any vertical object near the fire, so you put a big flat rock or tall stump on one side and most smoke will follow that instead of you.

 

I've heard of wind tunnel testing of ship models to evaluate where the exhaust goes. CFD is probably also used.

 

Watch and weep.

http://video.dailymail.co.uk/video/mol/2016/05/25/889735258403223686/960x540_889735258403223686.mp4

Nightmare way to holiday.

 

I read about the concept of air bubbles reducing friction about 30 years ago.
It never panned out practically, but it pops up about every 10 years, with no proof.

POPS UP - get it???

It is an interesting idea.

There was a Sea Sled which claimed to work this way, but it effectively forced outside air down an inverted wide angle V shaped hull at high speed, not pumped air.

Anyone have any real data on Soviet torpedoes??? No I didn't think so.

 

two diff air-lube schemes.

1)big trapped bubble. Like a hovercraft with the edges buried in the water.

2)tiny bubbles from the center line.

#2 seems like it would be an option, since its just a bunch of air pipes through the hull at the keel.

 

There are several companies using or rather investigating this. Apparently used on a few tankers with 'some' success. A claimed fuel saving of 5%. Which may not sound much, but over the year and fleet = $$$

But these are low Fn vessels, and large!

Noted by these examples:

https://www.mhi-global.com/products/detail/engineering_mals.html

and here:

http://www.nyk.com/english/release/788/NE_100224.html

 

Air bubbles on a torpedo might be about cavitation. Preventing cavity collapse could be beneficial for the torpedoes own sonar.