I have a 16' aluminum v hull ouachita 1969 model. I have been looking for a second hand tiller operated motor and was planning on purchasing something 10hp or more. My questions is what is the most powerful motor i could/should safely use? Could i go as high as 25 hp? The boat is real stable in the water, not tippy at all, and measures 4.25' in width at the transom with a 16" depth. The transom is shallower in the center than at the sides. What type of motors have people used on similar boats? Also the boat is real light, i can move the trailer by myself no problem. I found a formula when searching online (beam*length*2)-90= max hp which for me would be 54hp which i know is way too much. Does anyone out there have the same boat and know the max motor size?