Let me tell you search man this plane is veryyyyyyy difficult to balance,you have to move the bat and/or receiver around to balance this .it wont hold a perfect horizontal balance,there is a small margine to balance horizontal you have to find it.What i use is 3.5 in from leading edge just like the manu,but it took me a longggggg time to be satisfied with the balance,also do it inverted.By the way im using os 46 fx.All in all this is a greatttttt plane to fly