dead thread, but in case anyone has one of these, i put my model motors 280 brushless back in over the winter and i've now got 2x 1800 2s bats and it runs fine with them. prop is an apc 5.5x4.5. haven't flown it yet, but i really hope it flys nicely as this was the first plane i built artf and i spent quite a lot of money on it as i bought it as a combo. flight report in a few months time !!