Originally Posted by slowstang305
Will it be ok with a 9.8? I know most people would suggest 30-40HP+ but that is not an option. I just need this boat to be able to go 8-9 knots. Possible? How do you think this boat will handle? What top speed do you think I will be able to reach?
It might just... to get there prop selection will probably be critical.
I'd expect you to manage 4-5 knots with no trouble at all - that will be the hull's maximum "displacement speed". After that the boat has to lift out the water to start planing. I think 10HP would be enough to keep you on the plane, and to maintain 9 knots but the question is can it get you over the hump necessary to get on the plane. This will be very sensitive to how the engine is trimmed, how the boat is loaded (how many people and how much stuff as well as how it is distributed).
It would manage it easily with 20HP (and probably get a top speed of something like 18-20 knots (I can do 22 knots with a slightly smaller / lighter boat and 20HP 2 stroke). I think you'd manage OK with 15HP, and with some skill and playing around lightly loaded with 9.8 HP you might just get away with it.