04-03-2015, 06:58 AM
User Info
Lots of folks across the nation never see this, or maybe never even conceive of it.

They mention 8-12" of ice. That's not much. I've seen it much thicker in years past. It was also thicker when they were on the Penobscot last week.

I'm not going to pretend to know much about the actual operation of an icebreaker, but toward the end of the segment, when looking at the waterline you can see large air bubbles coming from under the boat. I'm guessing that air is injected under the boat. Does anyone know?

Kennebec: http://www.wmtw.com/news/coast-guard-bre...r/32129444

On the Penobscot:

32 6,491
 04-03-2015, 07:09 AM
User Info
Some ice breakers use air or jets of water to help glide over the ice once it breaks and gets pushed under the bow. Keeps the ice from grinding on the hull and provides less friction. Cool video! Thanks for sharing! 

153 3,706
 04-03-2015, 07:47 AM
User Info
Thanks Freddie, makes sense about the air. On the news it was extremely visible, not so much in those videos.

32 6,491
 04-03-2015, 08:22 AM
  • Johnny
  • Super Moderator
  • Wausau, Wisconsin, USA
User Info
Interesting.  Don't see to many of those in Texas. 

180 24,733
 04-03-2015, 12:21 PM
User Info
(04-03-2015, 08:22 AM)Johnny Wrote: Interesting.  Don't see to many of those in Texas. 


89 21,190
 04-03-2015, 10:19 PM
  • ThomTT
  • Junior Member
  • Long Island, NY
User Info
Pretty cool system, it's called a "bubbler" system and like Freddie said it forces water and air between the hull and ice to reduce friction (less horse power needed). Spent some between RI and Maine working buoys and breaking ice before before my current unit.  Spent one summer in the arctic circle, nothing like ice scrapping accross the hull and 24 hours of day light to screw with your sleep, but I miss it and hope to get back North next year.

That is a 140ft bay class icebreaking tug in the video.

4 14
 04-11-2015, 03:30 PM
User Info
I enjoyed the video. Thanks.

And thanks to Freddie and Thom who explained the air bubbler system. You learn something new every day.


7 363
Users browsing this thread: 1 Guest(s)