It was [link=http://www.hobbyking.com/hobbyking/store/__8594__2848SL_3900kv_Brushless_Inrunner_WaterCool ed_.html]this 3900kv motor[/link] from HK. Lots of power. I use the same motor in an ABC Jet SKi also with good results. I've never gps'd it, but I think the upper 40's would be close. Maybe low 50's. It was quite exhilarating for a little boat.