I have a 97 crestliner 19.5 ft sportfish with a 4.3 GL vortec volvo penta with an sx drive.I can get max of 4100 rpms and its really hard to get on plane. Just got the boat , I dont know what HP is. It currantly has a 3 blade aluminum that is 15x17. Does anyone know what rpms I should hit and what kind of prop size it should have.
