I got a formosa with E-go brushless which is 3700 rpm , 25amp phonex,Gws gear(B) and i made a 9cell nimh pack. Its not taking off from ground even after 50 ft or more. the prop recommended for this brushless was 9x4.5. tried the 9x4.5 and the 8x6 but it wouldnt take off or fly. At first motor was cutting off but after fully charging the battery pack ,motor is not cutting but still wouldnt take off. I didnt want try hand launching again after my first crash.Dont know what to do! should i make 10cell pack ?would a 3700rpm handle the 10cell with 9x4.5prop?