Thread: Power boat for the young fulla

Originally Posted by mucko

Johnson/evinrude changed from flywheel rating to prop rating around 1988 j140hp at the flywheel now equals 115 shaft hp. the trim plate at the top of the skeg needs to be parallel to the keel at half trim the height of the transom will be determinded by the length of the leg (mounting bracket down to trim plate) the trim plate may only need to be 10-20mm lower then the keel. if set to high you will lose trim and also you will ventilate the prop losing power and posablly depriving the leg of water and running your cooling impeller dry.

Your a legend Mucko, I'll be able to design the whole ass end of the boat off 1 paragraph.