Boat Prop Sizing What Size Prop Should I Use On Boat To Get More Speed?

What size prop should i use on boat to get more speed? - boat prop sizing

I have a boat of 15.3 feet with a 1976 70hp Evenrude and as fast as I can, is 32 mph I do not know what size and support as many leaves in my bra and what happened to the maximum speed of to get my boat.