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Old 09-09-2013, 07:31 PM   #1
Tad Roberts's Avatar
City: Flattop Islands
Country: Canada
Vessel Name: Blackfish
Vessel Model: custom
Join Date: Dec 2012
Posts: 686
Anti-rolling tank

It seems the Frahm anti-rolling tank has been re-discovered...

New ship will remain stable by creating its own inner waves

The video is a good comparison.

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Old 09-11-2013, 10:30 AM   #2
brian eiland's Avatar
City: St Augustine, FL
Country: USA & Thailand
Vessel Name: RunningTide
Vessel Model: 37 Louisiane catamaran
Join Date: Jul 2013
Posts: 796
Looked at that video a number of times, and at one point thought the conditions for the rolling vessel were slightly more extreme? But the again perhaps that was the rolling vessel making things a bit more 'rolly'.

Anyway I wonder how large that system needs to be on board?. Nice damping.

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Old 09-13-2013, 03:33 PM   #3
Brooksie's Avatar
City: Cape Cod, MA
Country: USA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 863
I have always wanted to try an antirolling tank on my Willard and I have the room to do so albeit after removing the aft deck. From what I have read, they are never used on small vessels (<60') and I have read about everything I could find. Also the calculations for design are well beyond my arithmatic abilities. Professor Bass (canada) has designed a number of tanks for small 65' fishing trawlers and states that they need only hold 2-3% of the vessel's displacement depending on , ampung other things, the tank's height in the vessel. This seems like little more than double the normal fresh water supply aboard a cruising vessel.
Does anyone know of a success story with these tanks?
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