Fifteen years ago I had batwings installed on Tamarack, a converted 52 foot seiner. The work was done by Chris Earle at his place of business called Gronlund Boatworks at 16971 River Road in Richmond, a suburb of Vancouver, BC. 604-244-7402 He was the West Coast batwing guru then, and since he’s still in business I imagine he’s even more knowledgeable now. I thought his design and build were first rate. I estimated that roll was reduced by about 60% while top speed was reduced by about a knot from 11 to 10 knots. I continue to think that it was the best money I spent on the boat. Terry Ex-Tamarack