Penny and I have had the pleasure, in the past four years, to go aboard several classic passagemakers: Mona Mona, Champion, Chartwell, and Teka III, and to see their machinery spaces. These are all traditional single-engine passagemakers with more miles under their keels than any of us will ever have. I don't believe any had wing engines. As I recall, some had roller-chain drive from an aux. engine or genset via a reverse gear or hydraulic pump. These setups were capable of providing about half the HP of the main engine, if need be. Our boat has a 27HP Yanmar wing and although it will propel the boat at 5 knots in flat water I have no doubt that I'd not be pleased to have to use it long at sea. I believe the current trend in new construction is to provide about 60 HP for a wing in a boat our size (53' LOD, 46' LWL, sailing hull, 80,000lb displacement). Regards, John "Seahorse" > I was once aboard a Krogen that had a small engine mounted above the driveshaft. The engine was normally used as DC generator, which kept it in good shape and ready to run. It had a sprocket that could be connected by a roller chain to another sprocket the main driveshaft. The boat's owner said that could be done in about 20 minutes (I assume not in a rolling sea!). **************Play online games for FREE at Games.com! All of your favorites, no registration required and great graphics b check it out! (http://pr.atwola.com/promoclk/100000075x1211202682x1200689022/aol?redir= http://www.games.com?ncid=emlcntusgame00000001)