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Hull Lubrication
http://67.205.157.234/forums/viewtopic.php?f=3&t=2501		 Page 1 of 1
Author:  Rusel [ January 19th, 2012, 11:32 pm ]
Post subject:  Hull Lubrication
Here is the link to Mitsubishi's new air curtain hull lubrication system
http://www.mhi.co.jp/technology/review/ ... 481053.pdf
Have any bucketeers seen the real thing yet?
Author:  Paul Carl [ January 20th, 2012, 2:33 am ]
Post subject:  Re: Hull Lubrication
The USCG has this system for their Icebreakers
http://www.uscg.mil/d9/cgcBiscayneBay/History.asp
Author:  RP1 [ January 20th, 2012, 6:29 pm ]
Post subject:  Re: Hull Lubrication
It's not the same thing. Icebreaker lubrication is more similar in some ways to Masker.

- RP1
Author:  heuhen [ January 20th, 2012, 7:36 pm ]
Post subject:  Re: Hull Lubrication
And we in Norway have similar system and have bean using it for tens of years now.
Author:  RP1 [ January 20th, 2012, 8:24 pm ]
Post subject:  Re: Hull Lubrication
Similar to what? The icebreaker lubrication or the skin-friction reduction system? The former is common, the latter is still new and somewhat controversial.

- RP1
Author:  heuhen [ January 20th, 2012, 9:07 pm ]
Post subject:  Re: Hull Lubrication
if I'm not mistaken so are Sweden testing such a system for large container ships.

Most sail boats from the Viking Age (you know how the Viking use their boats) was built in that way that it collects air under the hull so that they could sail faster, and many of the Norwegian tradition sailing boats (in Norway) uses the same method today. (And kind of boats I have built even!)

(size exaggerated a bit: but this boat can come up in 30 meters!)
[ img ]

And if I do not remember wrong we have a Norwegian engineer down in Greece, where he is testing a similar system that Canadians, just for planing single hull that can do more than 35 knots.

So this is nothing new for me.
Author:  KimWerner [ January 20th, 2012, 10:45 pm ]
Post subject:  Re: Hull Lubrication
Yes, you're quite right. One of my physical interest's is rowing. The danish inrigger rowboat (developed in England in the 19th century after studies of viking boats) use that method. You can see a lot of air bubbles in the wake ;)
Author:  Rusel [ January 21st, 2012, 8:32 am ]
Post subject:  Re: Hull Lubrication
Thanks for that folks
here's a quote from
http://www.norseamerica.com/catalog/ite ... 016486.htm
"Another Viking innovation was speed. They achieved speed by building extremely strong and lightweight ships. They maximized speed through tightly knit sails, oars and the shape of the hull. The hull was designed to send the air bubbles that were created, as the ship cut through the water, directly under the ship. This use of airflow made the ships even more buoyant and lighter allowing them to pick up even more speed. The fast and maneuverable long ships could sail at over 7 knots (13km/hr). If the wind dropped, they lowered the sail and rowed instead. A raiding party could sail from Norway to England in under two days. No other ships of the day could come close to catching them."
What I was wondering is if anyone has experinced the difference that the new applications of this technique can produce.
Also I can't find any stats on the advantage produced in the viking boats. Mitsubishi is claiming a 10% efficiency gain.
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