The gaff rig on Kevin's catboat is a very versatile, albeit inefficient rig. When you start getting overpowered, you can simply ease the line which hoists the top portion of the gaff (the boom on the top) and it will dump air. Most of these rigs have reef points which are a more efficient way of dealing with increased wind, but its a tough job while underway when dealing with 18' boom. I have had my catboat for 7 years, and although I sail the catamaran more often, it is a relaxing change of pace. I can take out family and non sailing friends and even finish a beer before it gets warm. Ironically the demensions other than weight are pretty similar-18' LOA, 8'beam, 240 sq' sail..but over 3000 lbs!