Best thing is to use two servos for the dive planes. First servo is connected to the stern and bow (in the forward wing) planes - these are used for pitch control. Second servo controls the sail planes for depth control. The stern and bow planes move in oppositte directions - bow planes move up, stern planes move down. For the Moebius SEAVIEW, I used 36" long brass rods to make up the bow plane linkage. These are connected to the stern plane linkage with some Dubro or Great Planes wheel collares (be sure to replace the mild steel set screws with stainless).