Ed, the info I received from Don at Eureka, from Jim Martins origional drawing shows the barn doors controlled by 5/32 tork rods. I agree that bell cranks would be inviting disaster. If i go the bd route I will probably use the modern 2 servo situation. Although this install might mess with the aerodynamics on the outer wing surface. Seeing this thing is going ballistic speeds I'm not sure what effect the drag outboard on the wing might have........any thoughts? Freebird, If just one person learns a new technic it will make all the extra effort well worth your trouble in my mind. Not everyone has 35+ years of building experience. I doubt I would have thought of a scarf joint on the stab so I've already learned something from a fellow modeler. Thanks for your continuing efforts......Sugarfox