I have a medium size airplane that has a 400 watt brushless motor on it turning a 11" x 5.5e prop running on a 3 cell 2200 mahr battery. At full throttle, about 8,000 rpm, the motor pulls 17.3 amps at about 200 watts. I would like a little more power and since I had to add 4 oz of nose weight to make the airplane balance, was thinking of replacing the motor with a larger one. Maybe something in the 600 to 800 watt range. The motor is a 1000kv motor. I thought that at the medium voltage of about 11.8 volts, the motor would produce a rpm of about 10,000 rpm allowing for some efficiency losses and that the amperage would increase from my measured 17.3 amps in order to produce more rpm then my 8,000 rpm? If I went to a 800 watt 1000kv motor, would I get about the same rpm since both motors are 1000kv motors? Would the measured amperage and wattage be about the same? Would I get about the same flight time from my battery assuming I was using the same size prop? So, what pros and cons would I have going to a larger heavier motor?