I am using a mathbox on my rudder but I only bought a pair and thought I'd try mixing the rudder then move the rudder matchbox for use on one wing and use the other matchbox I have sitting in a box on the other wing. I am getting along quite well without the wing matchboxes but wouldn't mind fine tuning the wing panels. My two 2400mAh Lion packs stand up fine to a day at the field so I guess I am not drawing too much amperage.