I have a couple earlier post you can refer to,to see what all I have in my corsair. It balanced out perfectly without adding any weight.I too was wondering the same thing when I built mine.I was warned by others on here before I flew my corsair and now I will warn any others who read this.Be very careful not to come up too early on your first take off. The warnings I received ,I know,was the only thing that kept me from crashing mine.The tail will try and come up quick and so will the plane if you let it.Be sure and run down the runway a good bit and also be very careful about having too much elevator throw.It wont take much at all.My bird flies great and I am thankful for all those who shared their valuable experience with me before I flew mine. Just fyi. Hope it helps.Feel free to email any questions. Tivey