< This paper gives interesting pictures and curves for roll using paravanes and water tanks. https://www.researchgate.net/publication/290798342_Roll_stabilization_for_small_fishing_vessels_using_paravanes_and_anti-roll_tanks <https://www.researchgate.net/publication/290798342_Roll_stabilization_for_small_fishing_vessels_using_paravanes_and_anti-roll_tanks> > It is this article that was published in the Society Of Naval Architects & Marine Engineers journal that lead me to Dr. Bass, the designer of our tanks. I visited Don at Memorial University and spent two fascinating days with him, partly in his towing tank facility and touring some of the fishing boats with tanks and chatting with the crews. The Canadian government had put a sixty-five foot limit on this class of fishing vessels, which had lead to some of the most bizarre designs I have seen with beams of up to thirty-five feet, causing horrendous motion at sea, not the least of which was pitching moment. There were tank models of different ideas of how to mitigate pitch from keel plates to bow bulbs, as well as different tank locations for roll attenuation. Bow bulbs of up to twenty-feet and keel plates the widths of the boat, both of which were mostly ineffective. One of the alternate tank location models had the tank built into the transom, which would have been nice as a pleasure boat add-on, but didn’t prove effective enough compared to the optimum placement at 55% of LWL, as high as possible, and 2% of displacement, which is exactly where my tank ended up. Over the years since then we discussed different ideas, such as multiple small tanks and even inflatable tanks, but didn’t pursue them. Unfortunately my file with all of the modeling was destroyed when Irma removed the roof and most everything in my office and business, as well as my boat. Robert Phillips Doyle Sailmakers BVI, Ltd. bob@doylecaribbean.com Mobile 284-541-2206 Office 284-494-2569