stelerzman great thread i was wondering if you might be able to help me with my boat i got a use ul-1 it has an 1800kv motor and esc out of a spartan i run 4400 40c 2s bats all the way in the sponsons so the area in front of the motor has nothing there i have an 642 prop s\b on it now . the questions is im going to the grim 40/57/3 blade what should i make the strut hieght with this prop and how to get ride of chime walk it really bad boat get up on plane very fast and the boat really movers just unstable thanks for any help