Im trying to figure out what size engine to get for a thirty foot outrigger sailing canoe(proa),figure less than a thousand pounds.ive read about a guy using an 9.9 four stroke and he could cruise at like 11 knots.Im kinda new to outboards and the prices on new and used arent very far apart.I kinda like knowing what oil was used and not buying someone elses abused problem.I considered a fifteen hp outboard at first, i considered a two stroke but now lean towards a 4 stroke.The new tohatsu 9.8 seems light.Any advice would be appretiated.