I made my maiden flight in my GP Big stick 40 ARF today and the same thing happens... Not to much of a dip but it did... My CG was at the recomended 3 3/4", but I think it may be a bit nose heavy... I guess the farther away your CG is from the flaps or center of lift, the more likely the aircraft will pitch down when flaps are applied. I am going to move my CG aft a little for better 3D, flat spins etc. and I bet it won't pitch down as much when the flaperons are applied... I hope that this works because it sure comes in hot on landing and I either NEED the flaperons or moving the CG aft in itself will make for a slower approach... Is my theory correct?