I took the 90 saito off of mine and put an e flite 60 on it. I mounted the batteries under the cowling adjacent to the motor. No lead required to balance.. I have flown 3 other dr-1 models and this is the best setup I have flown. The electric motor gives you great throttle control on landing- it will end up on its wheels 9 out of 10 times. And that is making three point landings.. Wheel landings are better.