i have an Esquif Heron (14 feet, about 38 inches wide, very nice canoe) with a square back for a motor. i use a Minn Kota with 30lbs thrust. it works well, trolls beautifully and is very quiet. moves me about 7 knots at it's fastest on a calm lake. i want to go much faster at times on bigger lakes but wouldn't you know it, stores just don't demo 3hp motors to guys like me for fun. so either plop down a thousand bucks and take my chances, or somehow find out an approximate speed that a 3/3.5 motor will move my canoe. any thoughts out there? thanks.