Jae .12 FE conversion, 120 amp esc, 3660 3180kv, and MaxsAmps 4s, batteries. The boat has been in the water a few times with lesser batteries, trying out props and keeping an eye on the temp, after 3 laps the temp is around 90-100F on the motor, 80-90F on the esc. The prop is a 1440 right now, and speeds are in the 60's.