GREAT PLANES RV-4 Instruction Manual page 37

the elevator. Using a felt tip pen, mark the drilling locations
for the screws. Drill a 1/16" [1.6mm] hole through the marks.
Attach a control horn to one of the elevator halves by
inserting two 2-56 x 5/8" [15.9mm] machine screws through
the control horn and elevator, attaching it to the nylon
control horn plate. Do this for both elevator halves.
6. Install a control horn to the right side of the rudder
following the same procedure used for the elevator.
7. Locate two die-cut 1/8" [3mm] plywood servo rails
(SR). Glue them into the servo bay in the fuselage at the
location shown on the plan.
8. From a leftover piece of the 36" [914mm] plastic flexible
outer pushrod, cut a piece to a length of 5-3/4" [146mm] and
install it through the remaining hole in the firewall and former
F3 for the throttle pushrod. Mark where the tube contacts
the firewall and former, roughen that area with sandpaper,
and then glue the tube in position.
9. Following the radio manufacturer's instructions for
mounting servos, install three servos onto the servo
mounting rails at the locations shown on the plan. Center the
servos. Then, position the servo arm as shown in the photo.
10. Locate two 2-56 x 36" [914mm] wire pushrods. Cut one
to a length of 30-1/2" [775mm] and the other to a length of 27-
1/2" [699mm]. Insert the wires into the two elevator outer
pushrods. (The threaded end should be at the rear of the
fuselage.) The longer wire should be in the tube on the left side
of the fuselage, the shorter on the right as shown in the photo.
11. Bend the shorter wire at the locations shown in the photo.
12. Locate two 5/32" [4mm] wheel collars and two
6-32 x 1/2" [13mm] socket head cap screws. Install the
screws into the wheel collars. Slide both wheel collars over
the two elevator pushrods. Do not tighten the set screws yet.
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