I don't know if this needs to be posted in boating or not. Sorry if it is in the wrong place.:embarassed: I have done some reading up on jack plates and think I have the concept in grasp. My question is if you get a manual jack plate adjusted for the best performance why would you need a hydraulic jack plate? From what I have read the cavitation plate (i think that is what it is called) needs to be about one inch above the hull of the boat for every six inches of set back??? I don't have any experience with jack plate yet but I will be getting some in the near future. Would i ever want to or need to replace a manual jack plate with a hydraulic or electric jack plate? I know it will allow me to raise the motor up higher but can't I do that with the trim? Thanks again and sorry if this is a stupid or repeat question.