smoke i have run my eflight 2700 motor on 4 cells for a bit on my funjett. the best prop on 4s has been the APC6x4 GAS prop for thrus and speed. you could run the APC 5.25x6.25 cut down some on 4s. Just keep cutting down till around 650 watts on the ground. i have run it on 1000 watts but could only get about a 20 second run on it before it got to hot.

Oh yeah forgot it will turn that 6x4 prop at 32,000