From: trawlerdoc@aol.com Installed paravanes on Rollsdoc several years ago. I suggest you look at other boats that have them to get some ideas. Beebe's revised book has some good information. Lots of basic info there. Each boat is different. <http://www.idlewildexpedition.ca/pictures/023_April_2006.htm>http://www.idlewildexpedition.ca/pictures/023_April_2006.htm Here is one boat that we studied. I have friends that used a navel architect with good results. In the end we designed and built our own for Rollsdoc. Like anchors get the next larger size bird than the one that is recommended. Rodger Wrona Rollsdoc MT49PH