Turbootter I would use 7 servos in that Unionville otter... That turbo beaver of mine is basically the same size and I went with 7..And I put the rud and elev servos in the tail. I made up the servo extensions myself used 20 g wire, any 1 meter extension will work fine. I have no glitches with this set up... The wing should have a servo for each surface, it makes it so easy to set up and the likage is positive, (4" from servo to control horn).. What floats are you going to use...