So far i've only had 3 planes, and one that is inverted, my 46AX in the WM Dago Red, and it hasn't been an easy intro to inverts. Its hard to get the tune to stay consistant and correct, but i guess that will come with experience. The only thing to note is that a coweled engine needs to be run richer, to prevent heat damage. The reason i think for my stalling problems during flight is because the tank is too high, but due to the way the wing mounts and the amount of room for the tank it isn't possible to modify it and lower the tank, so its just gunna be a persaverance issue i think until it goes dead to far away