Posts: 32935
Location: Rhinelander, Wisconsin | One reason that boat porpoises at that speed is weight distribution and the lift at that rpm to the pad. The boat is trying to lift to the pad, but can't quite get it done and literally falls off again, causing the boat to 'bounce'. At about 3800 to 4000, the engine needs to be trimmed down. One way to fix the issue is a TH Marine 5 degree motor wedge, giving you 5 degrees more negative tuck. Another is to try a Rev 4 prop which may give you enough lift to power through the porpoise trimmed down, and no 'bounce' will be noticed.
The vented prop allows for gasses to escape quickly giving you a better hole shot, and with engine height correct should be sealed up by water flow.
http://www.mercurymarine.com/propellers/advantage/technologies/pvs/ |
