Hamman, do you still have your WM Ultimate? I just got one of these and have flown it a couple times. First flight was on a windy day and did not go well. I got it back on the ground safely, but it was close to a mishap. The second flight was on a calm day and went better. I am using the stock motor and wanted to know if the 480 was a good upgrade. Did you make any other modifications? How did it compare to your other bipe?