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You just gotta have a watt meeter to survive, 1 pitch in prop may mean good VS death to your equipment, its very cheep insurance and you KNOW whats going on. Its a strange world out there, nothing is really what is seams it should be. I run a apc 10 X 3.8 on a small axi 2208 with 10 amp controller, 1320 mah battery. All is happy, pulls 8 amps. I take the 10 X 3.8 and put it on a axi 2808, much larger and stronger motor. Thing pulls 47 amps. Cut prop down to 9.5 and low and behold 28 amps. Your batteries may be cheepie 8C and wll not provide the power required. You want 15 to 30C for decent present quality. Lots of old stuff out there for sale quite cheep. Problem is that they simply don't have the juce! ENJOY