I have a 27ft Baha its 7000 lbs I have a 9.9 hp Honda longshaft on my Baha its ok on calm water it SUCKS trolling into the wind. I have to run it at 5500-6500 rpms going into a moderate wind to keep the speed where I need it 1.8-2.1. I pull only big boards and fish the Eastern Basin mostly, we do fish around the Islands in early May every year and troll a little slower when were there it was a little better trolling slower, my advise is to go with a 15hp Long shaft after this season I will be getting a 15hp for my boat. Just my .02cents.