ktrydancer

the prop is 3 blade. from a dead start i get the rpms up to about 1800 slowly and then give it about 3/4 throttle to get it on plane. i start with it trimmed about 1/2 way between level and all under. i try to run at about 3500 rpm. when i get it on plane it starts to porpoise and i trim it furthur down to stop it then begin to trim it back up slowly. i bought boat from my mother after he passed. she said he never seemed to have a problem with it. I wondered if i was trimming it under too much and water is blocking the exhaust and causing the engine trouble warning to go off before i get it trimmed back up? i took the hydrofoil off to see if it ran better without it but it ran worse.

this was my fathers boat. sad to say he is no longer here to show me how to use it. i am sure he less than 100 hours on the motor. he got sick not long after he bought it. it has original prop and engine height set at factory. no jackplate. it has a hydrofoil he put on when he bought it. never had it wide open. porpoising is with just me in boat.

I purchased a nitro 882 with 150 mercury. this is my first high performace boat. I am having a problem with planing. when i trim down to take off and get on plane the boat porpoises and when i trim even further down to stop the porpose problem the motor alarm goes off. i get on plane at about 3000 rpm. if i do not trim down to get on plane the front of the boat comes way out of the water and will not get up on plane. any suggestions. thanx