The topic of motorsailer has a few implications. A sailing boat for all intents and purposes is firstly to sail boat and has a motor as an additional aid for the lack of wind and of course entering and leaving port. Thereafter sailing boats were designed and built as purpose built Motor Sailers, firstly to sail thereafter to motor at a faster pace and when used with the motor and sail, hence Motor Sailer. Many of these boats could not sail nor motor very well, as we always said, real dogs in all conditions, but they still sold. With regards to purpose designed and built Power Catamaran that should motor at speeds ranging from 8 to 22 knots, at least, we find ourselves in a precarious position, the reason, motoring along with a lovely beam wind of 10 to 30 knots can be frustrating. Therefore if we accommodate a mast, with easy to handle asymmetrical spinnakers, we could sail along at a pretty good pace, especially if we find ourselves in the trades. It must then be summarized as such, firstly, as a purpose built Power Catamaran that can be assisted by wind ( extreme example, the large Cruise Ship Club Med with 4 masts) Therefore I believe a Power "wind assisted" Catamaran is an extra bonus when the conditions are correct and should be built and sold as such, not a Motor Sailer. When you are paying, as in our case nearly $650.000 for an Aventure 50, the cost of the mast and sails is not a train smash, and if you save on the shipping costs, not a cent. You now have the pleasure of sailing in the right conditions and would even venture on longer passages with your wind assisted sails, but when need be she is still a real Power Catamaran with capable speeds of up to 22 Knots. regards, Tim Jordaan Aventure "wind assisted" Power Catamarans http://www.aventure-catamaran.com/