k&b lower 700bb Prop???

[maxxcrawler]

I know nothing about props, Ill start there. I am building a 32"l 14" wide tunnel hull. Using a K&b lower cut down and polished, running a 700 bb direct drive. looks like Im running a 3s lipo since most agree that 22v will kill the motor. Hull material is wood, unknown origin since I bought the hull bult but never used. Ive never used a prop that didnt come with the boat it was on and thus dont have a clue about prop selection. Im going to a speed of around 30mph more is good but thats my target. So what prop do I need?????

[BoatDoc]

go with 4s. from there...start with an x440 prop and work your way up. most brushed speed controllers don't have the proper voltage cut off for lipo, so don't over do your run time. i could check with some of the guys i know that run O/B's and see what props they're running as well.