I had the F1 outboard from Hobbyking which had a 28mm 3000kv motor
I ran it on 3S with a 45Amp ESC.
Great unit, but, clean and regrease after each days running.
Also they did not have spare flex drives.
The flex drives do not last very long.
I had it on a 24" shallow vee, trim and balance right would run at full speed just on the prop!!!
Totally insane to drive.
I did not install to 2836-3700kv with 700Watts!!!