Hi Dick, < A question/request for Dave and Bob. Could you kindly describe the tanks, physical dimensions, and tank capacity. Also would like to know where the tanks are mounted. I?m assuming they are up high and run the full width of the flybridge? Finally what are your thoughts on installing these tanks on, say a 40 foot trawler style boat? Thanks….Dick > Tanks like ours, both designed by a professor of mathematics and naval architecture at Memorial University in Newfoundland with extensive experience designing tanks for the sixty-five foot class of fishing trawlers operating in the North Atlantic, are specific to a particular vessel. My tank is almost three times the size of Dave’s because my vessel was much less inclined to roll; Dave’s hull shape is very round and shallow with much less freeboard and beam. My boat had a considerable amount of lead ballast in the keel, tanked for 3700 gallons of fuel in the bilge, draft of 6.5’, freeboard amidships of 8.0’, beam 18.5’. The tank was full width, 36” high, 48” wide, 300 gals of water which was 1/3 of the tank volume. There were baffles a foot or so in from the ends and the center six feet of the tank was narrower by four inches each side. The weight was needed to start the boat rolling, at which point the baffles and restriction in width caused the water to be out of phase with the roll and cancelled it out; one partial roll and stopped. There is some very complex mathematics in the design and engineering to accommodate the weight where it needs to be, up high for the leverage. A friend of mine was involved with the building of six product tankers running the west coast and out to Hawaii, in which they had fitted 125,000 gallon tanks after the crew of the first one in service reported it rolled so badly on a downwind run to Hawaii the galley was unusable. Like Dave, other than paint on the outside of the tank, I had zero maintenance with the tank in sixteen years of use; checked the water level periodically if I thought about it, which wasn’t often as it ran 24/7/365 with no effort on my part. Fitting one to a boat is like any other custom project, want vs cost. In my case it was our family home and the available marina in Road Harbour was rarely calm causing us to eat on the dock on more than one occasion pre-tank; to me it was the best piece of equipment I ever added to the boat. Robert Phillips Doyle Sailmakers BVI, Ltd. bob@doylecaribbean.com Mobile 284-541-2206 Office 284-494-2569