if weather agrees sunday im suppose to test out some new set ups on planes and my new heli/my buddy is suppose to test out the 400 e-flite outrunner set up. currently it will be with 11x4.7 slow fly prop. so far he says it doesnt drop as fast during static tests inside when held vertical like it does with kit motor. it did fly well from what i seen with stock motor and 10.8v typhoon pack he was using. i'll see if i can weigh his stock gearbox and motor for comparison if he brings it. something to consider... you can gain performance through wait savings and set up and dont always need more actual motor power for performance.