Elevator and rudder controls and linkages

General

All control horns are 6/32 all-thread epoxied into 1/2" dowel sections that are in turn set into 3/4" square cross-grain blocks epoxied into the control surfaces.

Elevator - the elevator linkage is a carbon pushrod with 4-40 hardware and ball bearing ends at both the servo and the elevator halves. The pushrod is approx 1/2" diameter. There is a 1/4 diameter carbon shaft at the aft end of the pushrod running in a fuse mounted brass tubing bearing.

Rudder - The rudder is pull-pull; A large aluminum arm on the servo pulls plastic-coated Kevlar cord which connects through Hayes steel pin clevises to the rudder control horns. The rudder cables cross inside the fuselage to give an improved exit angle through the fuselage.

Servo mounts - Because of an expected nose-heavy condition the servos will go at the rear of the canopy opening. The elevator and rudder servos are mounted on 3/16 laminated spruce rails.
All servo mounting is done with Allen-head servo screws. The aircraft is set for JR / Futaba standard size (e.g., 8231) servos.

Elevator servo: The elevator servo is side- mounted on an aluminum tray screwed to the fuse- mounted spruce rails.  Its position places the elevator pushrod as close as practicable to the fuse centerline. There is an access hole in the fuse side to allow removal of the servo wheel without dismounting the servo.

Rudder servo--  the rudder servo is mounted upright on spruce rails mounted into 1/4" balsa mounting pads glued to the fuse sides.

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