rustyk,my last boat was an 26ft american offshore same boat as yours.dont even waste your time on a three blade i tryed it just does not work.i was spining a 29p four blade on a 1;36 drive making around 800 ponies.if your motor is stock and your drive is 1:36 i would probaly go with a 24 four blade maybe have it worked to a 25 if its working good.