oh... and welcome board... :welcome:
keep in mind there are sooooo many factors in determining the speed of your boat, prop, water, temperature, condition of the hull (this is a big factor), weight of people in boat, gear in the boat, how much gas you have in the tank.... you can have two identical boats and one will be faster. Someone correct me but horse power rating of a boat is best educated guess. I'm thinking no two motors will have the same amount of power and no two hulls will be exactly the same.