timber i have a few flights on this same combo 5 3/4 c.g. was where i was comfy. i have battery next to fuel tank left side. after about 4 flights the big os didn't transition from low speed very good. even had two dead sticks. i leaned down the low speed needle a full turn {what a difference} if i was you i would add a little WEIGHT to the motor mount and fly it first you can always remove a little at a time . these planes seem to vary a bit so your kind a on your own . better safe than sorry. { it flys very easy just keep the throws on the LOW side at first .this plane is very sensitive to imput}